CN111478537B

CN111478537B - Difference-free variable speed motor with variable stator kit

Info

Publication number: CN111478537B
Application number: CN202010397098.4A
Authority: CN
Inventors: 不公告发明人
Original assignee: Suzhou Batao Information Technology Co ltd
Current assignee: Suzhou Batao Information Technology Co ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2021-02-09
Anticipated expiration: 2040-05-12
Also published as: CN111478537A

Abstract

The invention discloses a non-differential variable-speed motor with a variable stator kit, which comprises an output shaft, a first shaft, a second shaft, a main machine shell, a main coil, an auxiliary machine shell and an auxiliary coil, wherein the main coil is fixed on the inner wall of the main machine shell, the auxiliary coil is fixed on the inner wall of the auxiliary machine shell, the main machine shell and the auxiliary machine shell are detachably connected through a fastener, the first shaft is in transmission connection with the main coil, the second shaft is directly or indirectly in transmission connection with the auxiliary coil, one end of the output shaft is positioned in the main machine shell, one end of the output shaft extends out of one side of the main machine shell, which is far away from the auxiliary machine shell, and serves as an external output end, the output. The first shaft and the second shaft with two rotating speeds are used for combined transmission, and finally, a third rotating speed is formed on the output shaft, and the third rotating speed has different relations with the rotating speeds of the first shaft and the second shaft according to different transmission structures, so that the rotating speed with an expanded range or within a specific range is obtained.

Description

Difference-free variable speed motor with variable stator kit

Technical Field

The invention relates to the field of motors, in particular to a non-differential variable-speed motor with a variable stator kit.

Background

The motor is a prime mover with wide industrial application, and is often used for speed regulation, the working condition requirement of fixed rotating speed is generally realized by the motor with fixed rotating speed and a gear box, and the rotating speed requirement which is changed according to the process requirement is generally completed by the variable frequency control of the motor.

In the prior art, the efficiency of the motor is influenced by the frequency conversion control of the motor, when the motor runs at a low frequency, the rotating speed is not accurate and the heating is large due to insufficient excitation of an internal coil of the motor, the efficiency of the whole machine is reduced, the frequency is lower and the overall efficiency is lower when the high-efficiency running range of a common frequency conversion motor is 50-100% of power frequency, and the running economy is obviously influenced; however, in many cases, the motor needs to operate at an ultra-low speed of several to tens of revolutions, and the motor needs to operate at an ultra-low frequency according to the conventional variable frequency motor, so that the efficiency is low, and in the variable frequency control of the conventional motor, the frequency change percentage and the rotation speed change percentage are one to one, that is, the frequency changes by 10%, and then the rotation speed changes by 10%, so that the fluctuation of the rotation speed of the motor is partially caused by the fluctuation of the power frequency, and the use requirement is not sufficient in some precision cases.

Disclosure of Invention

The invention aims to provide a non-differential variable speed motor with a variable stator kit, so as to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a no poor variable speed motor with variable stator external member, including the output shaft, the primary shaft, the secondary shaft, the main engine shell, the main coil, the auxiliary engine shell, fixed main coil on the main engine shell inner wall, fixed auxiliary engine coil on the auxiliary engine shell inner wall, the main engine shell carries out releasable connection through the fastener with the auxiliary engine shell, the primary shaft is connected with the main coil transmission, the secondary shaft is direct or indirect transmission is connected to on the auxiliary engine coil, output shaft one end is located the main engine shell, one end stretches out one side that the main engine shell deviates from the auxiliary engine shell and is regarded as external output, the output shaft and the primary shaft, the secondary shaft carries out variable speed transmission and is connected.

The invention carries out independent frequency conversion through double coils, carries out combined transmission by a first shaft and a second shaft with two rotating speeds, and finally constructs a third rotating speed on an output shaft, wherein the third rotating speed has different relations with the rotating speeds of the first shaft and the second shaft according to different transmission structures, thereby obtaining the rotating speed with an expanded range or a specific range, the rotating speed of the frequency conversion control can be steplessly changed, and the rotating speed of the output shaft can also be steplessly changed.

Furthermore, the second shaft is a hollow shaft, the first shaft penetrates through the second shaft and is provided with a bearing between the first shaft and the second shaft, the first shaft and the second shaft are coaxially arranged, one end of the first shaft extends out of the end part of the second shaft and is provided with a first gear at the outer end, the other end of the first shaft also extends out of the other end of the second shaft and is directly or indirectly connected to the secondary coil, a second gear is arranged at the end part of the second shaft close to the first gear, the pitch circle radiuses of the first gear and the second gear are equal, the output shaft is supported and installed on the inner wall of the main machine shell through a bearing, the axis of the output shaft is overlapped with the axis of the first shaft, a disc is arranged at the end part of the output shaft in the main machine shell, the outer edge of the disc axially extends to form a cylinder, a plurality of circumferentially distributed coordination wheels are arranged on the wall surface of the cylinder through the bearing, the axis of the coordination wheels is perpendicular to the axis of the output shaft and is intersected with the axis of the output.

Furthermore, the variable speed motor also comprises a countershaft, the countershaft is fixedly connected to the middle position of the secondary coil, the axis of the countershaft is overlapped with that of the first shaft, and the countershaft is in transmission connection with the first shaft through a splicing transmission structure. The auxiliary machine shell and the auxiliary coil are replaceable, a fastening piece between the auxiliary machine shell and the main machine shell is detached during replacement, however, if a first shaft in transmission connection with the auxiliary coil is replaced, the gear set is cumbersome to replace, and practical use is affected.

Furthermore, the inserting transmission structure is an inserting joint and an inserting hole which are arranged at the end parts of the first shaft and the auxiliary shaft and matched with each other, the inserting joint has a square section, and the inserting joint can be in spline connection or hole shaft matching with key connection. The square-section plug connector and the plug hole are directly inserted to complete transmission, the connection is the simplest spline connection, and a traditional spline structure with stable transmission can be used, but the processing is slightly complex.

Further, variable speed motor still includes bearing disc, lock nut, and the bearing disc passes through the fastener and installs to main casing or vice casing inner wall on, and bearing disc central point puts and sets up the bearing hole and settle the bearing that is used for supporting the secondary shaft, and the secondary shaft is equipped with the external screw thread in bearing support position, screw in lock nut on the external screw thread, and lock nut supports tight bearing and carries out axial locking, and the one end that the secondary shaft kept away from the primary shaft also carries out rotation support through bearing, lock nut.

Furthermore, the bearing disc makes things convenient for the bearing to install in suitable position, and bearing disc and main casing, vice casing components of a whole that can function independently are connected, also can reduce the processing requirement to the casing, and the bearing disc part has been compared in the casing and has been little a lot, and the machining precision can be guaranteed, and in addition, the bearing disc is torn down and is just conveniently carried out the coil and arrange, and lock nut closes the epaxial position that carries out the bearing and support soon, carries out axial positioning and the fastening of axle.

Furthermore, one side of the auxiliary case, which is far away from the main case, is provided with a lock shaft assembly, and the lock shaft assembly is used for selectively locking the rotation of the auxiliary shaft. Sometimes the rotation of the secondary shaft driven by the primary coil is enough, the secondary coil does not need to be electrified for driving, the rotation speed of the output shaft is equal to half of the rotation speed W of the secondary shaft, at the moment, if the first shaft is not limited, the first shaft can spontaneously slip and rotate (because the secondary coil is not electrified, the first shaft rotates freely), the transmission equation is influenced, and therefore, a structure is needed to be used for locking the rotation of the first shaft, so that the rotation speed of the first shaft is determined to be zero.

Further, the lock axle subassembly includes the end cover, locks dish, retaining member, and vice casing tip fixed connection end cover, and the one end tip that the counter was kept away from the primary shaft stretches out vice casing and end cover, and the one end that the counter stretches out vice casing is the square head, locks dish central authorities and is equipped with square head assorted lock dead hole, and the dish that locks passes through the retaining member removable fixed to the end cover. When the locking plate is fixed to the end cover through the locking piece, the central position of the locking plate is inserted into the auxiliary shaft, the rotation of the auxiliary shaft is locked, and the rotating speed of the first shaft is guaranteed to be zero.

Furthermore, the lock shaft assembly also comprises a shaft seal which is arranged on the inner ring of the end cover and is in surface contact with the auxiliary shaft at the position for sealing. The shaft seal is used for preventing external dust from entering the interior of the motor from the end cover.

Furthermore, the matching wheel, the first gear and the second gear are helical bevel gears. The helical bevel gear is one of the gears with vertical axes and stable transmission.

Furthermore, a detachable cover is arranged on one side of the main machine shell close to the output shaft, the first gear is detachably connected to the end portion of the first shaft, and the second gear is detachably connected to the end portion of the second shaft. The gear unit may be damaged during operation, so that the detachable connection and the detachable cover of the main chassis on the gear unit side can be easily repaired.

Compared with the prior art, the invention has the beneficial effects that: the double-stator-rotor double-coil ultra-low speed input device carries out double-rotation-speed input through the double stator and rotor coils, and an ultra-low rotation speed containing zero rotation speed is constructed on the output shaft through the gear set, so that a low rotation speed range is obtained while the coils keep a high-efficiency excitation state, and in addition, the sensitivity of the output shaft rotation speed controlled by the double coils to power supply frequency fluctuation is smaller by more than half, namely the rotation speed can be stably kept after being adjusted.

Drawings

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a speed-distributing gear set of the present invention;

FIG. 3 is a schematic view of FIG. 2 taken along line A;

FIG. 4 is a structural diagram of the joint of the main chassis and the sub-chassis according to the present invention;

fig. 5 is a structural view at the rear of the sub-housing of the present invention.

In the figure: 11-output shaft, 12-registration wheel, 13-first shaft, 131-first gear, 14-second shaft, 141-second gear, 142-external thread, 2-main machine shell, 3-main coil, 4-auxiliary machine shell, 5-auxiliary coil, 6-auxiliary shaft, 61-square head, 7-locking shaft component, 71-end cover, 72-locking disk, 721-locking hole, 73-locking piece, 74-shaft seal, 81-bearing disk, 82-bearing, 83-locking nut and 84-plug-in transmission structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a non-differential variable speed motor with a variable stator kit comprises an output shaft 11, a first shaft 13, a second shaft 14, a main case 2, a main coil 3, an auxiliary case 4 and an auxiliary coil 5, wherein the main coil 3 is fixed on the inner wall of the main case 2, the auxiliary coil 5 is fixed on the inner wall of the auxiliary case 4, the main case 2 and the auxiliary case 4 are detachably connected through a fastener, the first shaft 13 is in transmission connection with the main coil 3, the second shaft 14 is directly or indirectly in transmission connection with the auxiliary coil 5, one end of the output shaft 11 is located in the main case 2, and one end of the output shaft extends out of one side of the main case 2, which is far away from the auxiliary case 4, and serves as an external output end, the output shaft 11 is in variable speed transmission connection with the first shaft 13 and.

The invention carries out independent frequency conversion through double coils, carries out combined transmission by a first shaft 13 and a second shaft 14 with two rotating speeds, and finally constructs a third rotating speed on an output shaft 11, wherein the rotating speed has different relations with the rotating speeds of the first shaft 13 and the second shaft 14 according to different transmission structures, thereby obtaining the rotating speed (such as the low-speed range of 0-300 rpm) with an expanded range or a specific range, the rotating speed of the frequency conversion control can be steplessly changed, and the rotating speed of the output shaft 11 can also be steplessly changed.

As shown in fig. 1 to 4, the second shaft 14 is a hollow shaft, the first shaft 13 penetrates through the second shaft 14 and is provided with a bearing 82 between the second shaft 14, the first shaft 13 and the second shaft 14 are coaxially arranged, one end of the first shaft 13 extends out of the end part of the second shaft 14 and is provided with a first gear 131 at the outer end, the other end of the first shaft 13 also extends out of the other end of the second shaft 14 and is directly or indirectly connected to the secondary coil 5, one end part of the second shaft 14 close to the first gear 131 is provided with a second gear 141, the pitch circle radii of the first gear 131 and the second gear 141 are equal, the output shaft 11 is supported and arranged on the inner wall of the main machine shell 2 through the bearing, the axis of the output shaft 11 is coincident with the axis of the first shaft 13, one end part of the output shaft 11 in the main machine shell 2 is provided with a circular disc, the outer edge of the circular disc axially extends into a cylinder, the registration wheel 12 is located between and simultaneously meshes with the first gear 131 and the second gear 141.

The present invention realizes speed distribution by meshing transmission of gear sets, as shown in fig. 2, which is a core structure of speed matching, a first gear 131 rotates with a first shaft 13 at an angular speed W3, a second gear 141 rotates with a second shaft 14 at an angular speed W4, both of which are meshed with a coordination wheel 12, if there is a rotational speed difference between them, the rotational speed difference between the first gear 131 and the second gear 141 causes rotation W2 of the coordination wheel 12, and the revolving rotational speed of the coordination wheel 12 around the first shaft 13 axis is affected by three rotational speeds, and the revolving rotational speed of the coordination wheel 12, that is, the output rotational speed W1 of the output shaft 11, the rotational radii of the first gear 131 and the second gear 141 are denoted as R1, that is, the revolving radius of the coordination wheel 12, and the rotation radius of the coordination wheel 12 is denoted as R2, thereby establishing a coupling relationship:

as shown in fig. 3, the first shaft 13 is rotated to be positive counterclockwise as viewed from the output shaft 11 end, is rotated to be positive counterclockwise as viewed radially from the outside to the inside,

the case where both the first shaft 13 and the second shaft 14 are rotating in the forward direction is calculated in advance:

in the calculation, W3, W4, R1, R2 are known amounts, W2 is an intermediate amount, the final objective is to obtain W1,

then:

W4R1＝W2R2+W1R1,

W3R1＝W1R1-W2R2

obtained after eliminating W2 from the above two formulae: w1 ═ (W3+ W4)/2;

it can be seen that the rotation speed of the output shaft 11 is the average of the rotation speeds of the first shaft 13 and the second shaft 14, for example, the rotation speed range of the first shaft 13 is 50% to 100% of the high-efficiency frequency conversion range of the single coil (selecting two-pole coil), then the synchronous rotation speed allocation range of the first shaft 13 is 1500 to 3000rpm, the rotation speed range of the second shaft 14 is 50% to 100% of the high-efficiency frequency conversion range of the single coil (selecting four-pole coil), then the synchronous rotation speed allocation range is 750 to 1500rpm, and the obtained total rotation speed range is: 1125-2250 rpm, which is not more than 3000rpm, which is the maximum rotation speed of the two coils, nor 750rpm, which is lower than the minimum rotation speed, but this range is not included in the operation range of the two separate coils, that is, none of the coils can maintain the operation with higher efficiency, and at the same time, have the rotation speed range of 1125-2250 rpm, that is, the dual-coil structure is used in combination, so that the high-efficiency frequency conversion operation range which cannot be achieved by a single coil can be obtained; in addition, when the single rotating speed is fixed, the other coil carries out variable frequency speed change, the speed change caused by the change of unit frequency is twice of the combined change, for example, the original one is 3000rpm, the original one is 1500rpm, when the 3000rpm is changed into 50hz because of 60hz, the speed change is 2500rpm, and the change is only half of the original change when the output shaft is changed into 2000rpm from 2250rpm, so the speed regulation is more accurate, and the rotating speed fluctuation caused by the frequency fluctuation is smaller;

looking again at the case where one of the first shaft 13 and the second shaft 14 rotates in reverse:

the direction of rotation of the first shaft 13 is clockwise when viewed from the output shaft 11, the speed scalar is calculated as W3, and the gearset engagement equation is:

W4R1＝W2R2+W1R1，

-W3R1＝W1R1-W2R2；

obtained after eliminating W2 from the above two formulae: w1 ═ (W4-W3)/2; the same W3 varies between 1500-3000 rpm, W4 varies between 750-1500 rpm, so that the variation range of W1 is: 1125 to 0rpm, that is, the rotation speed of the output shaft 11 is clockwise when viewed from the outside of the motor, the rotation speed is between 0 to 1125rpm, the rotation speed of the first shaft 13 and the rotation speed of the second shaft 14 are reversed, the rotation speed of the output shaft 11 ranges from +0 to 1125rpm, the rotation speed of the first shaft 13 and the rotation speed of the second shaft 14 are completely reversed, and the rotation speed ranges from-2250 to-1125 rpm;

through the rotation direction and the rotation speed change of the first shaft 13 and the second shaft 14, a complete range of-2250 rpm of the output shaft is obtained, and when a single coil still operates in an efficient frequency range, a low-speed operation range section near 0rpm can be obtained. The first shaft 13 can be made to have different rotating speed ranges by replacing the auxiliary casing 4 and the auxiliary coil 5, although the auxiliary coil 5 is replaced by a 4-pole coil and then only has an efficient operation range of 750-1500 rpm, and the rotating speed adjusting range constructed on the output shaft 11 after the coils are combined becomes smaller, the output shaft 11 can be greatly improved in rotating speed precision, and the rotating speed change caused by slight frequency fluctuation is smaller.

As shown in fig. 4, the variable speed motor further includes a secondary shaft 6, the secondary shaft 6 is fixedly connected to the middle position of the secondary coil 5, the secondary shaft 6 is axially overlapped with the first shaft 13, and the secondary shaft 6 is in transmission connection with the first shaft 13 through a plug-in transmission structure 84. The auxiliary housing 4 and the auxiliary coil 5 are replaceable, and the fastening piece between the auxiliary housing 4 and the main housing 2 can be disassembled when replacing, but if the first shaft 13 in transmission connection with the auxiliary coil 5 is also replaced, the gear set is complicated to replace, and the practical use is influenced, so the rotation transmission of the auxiliary coil 5 to the first shaft 11 is carried out through the auxiliary shaft 6, when the auxiliary housing 4 and the auxiliary coil 5 are replaced, the auxiliary shaft 6 fixedly connected with the auxiliary coil 5 is jointly taken down, the first shaft 13 is not required to be disassembled, and when a new auxiliary coil 5 and an auxiliary shaft 6 are replaced, only the new auxiliary shaft 6 is required to be connected with the first shaft 13 in an end-to-end transmission manner.

The plug-in transmission structure 84 is a plug-in connector and a plug-in hole which are arranged at the end parts of the first shaft 13 and the auxiliary shaft 6 and are matched with each other, the plug-in connector is of a square section and can be in spline connection or hole-shaft matching with key connection. The square-section plug connector and the plug hole are directly inserted to complete transmission, the connection is the simplest spline connection, and a traditional spline structure with stable transmission can be used, but the processing is slightly complex.

The variable speed motor further comprises a bearing disc 81 and a locking nut 83, the bearing disc 81 is mounted on the inner wall of the main casing 2 or the auxiliary casing 4 through a fastener, a bearing hole is formed in the center of the bearing disc 81 and used for accommodating a bearing 82 used for supporting the second shaft 14, an external thread 142 is arranged at the bearing supporting position of the second shaft 14, the locking nut 83 is screwed into the external thread 142, the locking nut 83 abuts against the bearing 82 to axially lock, and one end, far away from the first shaft 13, of the auxiliary shaft 6 is rotatably supported through the bearing 82 and the locking nut 83.

The bearing disc 81 facilitates the installation of the bearing at a proper position, the bearing disc 81 is connected with the main case 2 and the auxiliary case 4 in a split manner, the processing requirement on the case can be reduced, the parts of the bearing disc 81 are much smaller than the parts of the case, the processing precision can be ensured, in addition, the bearing disc 81 is detached to conveniently carry out coil arrangement, and the locking nut 83 is screwed on the position of the shaft for bearing support to carry out axial positioning and fastening of the shaft.

And a locking shaft assembly 7 is arranged on one side of the auxiliary machine shell 4, which is far away from the main machine shell 2, and the locking shaft assembly 7 is used for selectively locking the rotation of the auxiliary shaft 6. Sometimes it is sufficient to rotate the secondary shaft 14 driven by the primary coil 3, the secondary coil 5 does not have to be energized to drive, and the rotational speed of the output shaft 11 is equal to half the rotational speed W4 of the secondary shaft 14, at which time if the primary shaft 13 is not limited, it will slip and rotate spontaneously (because the secondary coil 5 is not energized, the primary shaft 13 is free to rotate), affecting the transmission equation, so it is necessary to use a structure to lock the rotation of the primary shaft 13 to make it zero.

The locking shaft assembly 7 comprises an end cover 71, a locking plate 72 and a locking member 73, the end part of the auxiliary case 4 is fixedly connected with the end cover 71, the end part of one end, far away from the first shaft 13, of the auxiliary shaft 6 extends out of the auxiliary case 4 and the end cover 71, one end, extending out of the auxiliary case 4, of the auxiliary shaft 6 is a square head 62, a locking hole 721 matched with the square head 62 is formed in the center of the locking plate 72, and the locking plate 72 is detachably fixed onto the end cover 71 through the locking member 73. When the locking plate 71 is fixed to the end cover 71 through the locking piece 73, the central position of the locking plate is inserted into the auxiliary shaft 6, the rotation of the auxiliary shaft 6 is locked, and the rotation speed of the first shaft 13 is guaranteed to be zero.

The lock shaft assembly 7 further includes a shaft seal 74, the shaft seal 74 being mounted on the inner race of the end cap 71 and sealing in axial face contact with the layshaft 6. The shaft seal 74 is used to prevent external dust from entering the interior of the motor from the end cover 71.

The registration wheel 12, the first gear 131 and the second gear 141 are helical bevel gears. The helical bevel gear is one of the gears with vertical axes and stable transmission.

The main housing 2 has a detachable cover on the side thereof adjacent to the output shaft 11, and the first gear 131 is detachably connected to the end of the first shaft 13, and the second gear 141 is detachably connected to the end of the second shaft 14. The gear unit may be damaged during operation, so that the detachable connection and the detachable cover of the main chassis 2 on the gear unit side can be easily repaired.

The main operation process of the device is as follows: the auxiliary coil 5 with proper pole number is selected according to the actual working condition requirement, the auxiliary casing 4 provided with the auxiliary coil 5 is arranged at the tail part of the main casing 2, the auxiliary shaft 6 is inserted with the first shaft 13, so that two first shafts 13 and two second shafts 14 which can independently control the rotating speed are obtained, and the two rotating speeds form a full-coverage rotating speed range including low rotating speed on the output shaft 11.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a no poor variable speed motor with variable stator external member which characterized in that: the variable speed motor comprises an output shaft (11), a first shaft (13), a second shaft (14), a main machine shell (2), a main coil (3), an auxiliary machine shell (4) and an auxiliary coil (5), a main coil (3) is fixed on the inner wall of the main machine shell (2), an auxiliary coil (5) is fixed on the inner wall of the auxiliary machine shell (4), the main casing (2) and the auxiliary casing (4) are detachably connected through a fastener, the first shaft (13) is in transmission connection with the main coil (3), the second shaft (14) is directly or indirectly in transmission connection with the auxiliary coil (5), one end of the output shaft (11) is positioned in the main case (2), one end of the output shaft extends out of one side of the main case (2) departing from the auxiliary case (4) and is used as an external output end, the output shaft (11) is in variable speed transmission connection with the first shaft (13) and the second shaft (14), the main coil (3) and the auxiliary coil (5) are provided with mutually independent variable frequency control;

the secondary shaft (14) is a hollow shaft, the first shaft (13) penetrates through the secondary shaft (14) and is provided with a bearing (82) between the first shaft (13) and the secondary shaft (14), the first shaft (13) and the secondary shaft (14) are coaxially arranged, one end of the first shaft (13) extends out of the end part of the secondary shaft (14) and is provided with a first gear (131) at the outer end, the other end of the first shaft (13) also extends out of the other end of the secondary shaft (14) and is directly or indirectly connected to the secondary coil (5), the end part of the secondary shaft (14) close to one end of the first gear (131) is provided with a second gear (141), the pitch circle radiuses of the first gear (131) and the second gear (141) are equal, the output shaft (11) is supported and installed on the inner wall of the main case (2) through the bearing, the axis of the output shaft (11) is coincident with the axis of the first, the outer edge of the disc axially extends to form a cylinder, a plurality of circumferentially distributed positioning wheels (12) are arranged on the wall surface of the cylinder through bearings, the axes of the positioning wheels (12) are perpendicular to the axis of the output shaft (11) and are intersected with the axis of the output shaft (11), and the positioning wheels (12) are positioned between the first gear (131) and the second gear (141) and are simultaneously meshed with the first gear and the second gear.

2. The electrical machine of claim 1, wherein: the variable speed motor further comprises a countershaft (6), the countershaft (6) is fixedly connected to the middle position of the secondary coil (5), the axial lines of the countershaft (6) and the first shaft (13) are overlapped, and the countershaft (6) is in transmission connection with the first shaft (13) through a plug-in transmission structure (84).

3. The electrical machine of claim 2, wherein: the plug-in transmission structure (84) is a plug-in connector and a plug-in hole which are arranged at the end parts of the first shaft (13) and the auxiliary shaft (6) and matched with each other, and the plug-in connector is square in section.

4. The electrical machine of claim 2, wherein: the variable speed motor further comprises a bearing disc (81) and a locking nut (83), the bearing disc (81) is installed on the inner wall of the main case (2) or the auxiliary case (4) through a fastener, a bearing hole is formed in the center of the bearing disc (81) and is arranged on the bearing (82) used for supporting the second shaft (14), the second shaft (14) is provided with an external thread (142) in a bearing supporting position, the locking nut (83) is screwed in the external thread (142), the locking nut (83) abuts against the bearing (82) to be axially locked, and one end, far away from the first shaft (13), of the auxiliary shaft (6) is rotatably supported through the bearing (82) and the locking nut (83).

5. The electrical machine of claim 2, wherein: one side of the auxiliary case (4) departing from the main case (2) is provided with a lock shaft assembly (7), and the lock shaft assembly (7) is used for selectively locking the rotation of the auxiliary shaft (6).

6. The electrical machine of claim 5, wherein: lock axle subassembly (7) including end cover (71), lock and die dish (72), retaining member (73), auxiliary housing (4) tip fixed connection end cover (71), auxiliary housing (4) and end cover (71) are stretched out to one end tip that first axle (13) were kept away from in auxiliary shaft (6), and the one end that auxiliary housing (4) were stretched out in auxiliary shaft (6) is square head (62), lock and die dish (72) central authorities be equipped with square head (62) assorted lock dead hole (721), lock and die dish (72) through retaining member (73) removable fixed to on end cover (71).

7. The electrical machine of claim 6, wherein: the shaft locking assembly (7) further comprises a shaft seal (74), and the shaft seal (74) is mounted on the inner ring of the end cover (71) and is in contact with the shaft surface of the auxiliary shaft (6) to seal.

8. The electrical machine of claim 1, wherein: the positioning wheel (12), the first gear (131) and the second gear (141) are helical bevel gears.

9. The electrical machine of claim 1, wherein: the side of the main machine shell (2) close to the output shaft (11) is provided with a detachable cover, the first gear (131) is detachably connected to the end part of the first shaft (13), and the second gear (141) is detachably connected to the end part of the second shaft (14).