CN102801268A

CN102801268A - Low-inductance low loss PMSM

Info

Publication number: CN102801268A
Application number: CN2012102687546A
Authority: CN
Inventors: 裴宇龙; 柴凤; 倪荣刚; 梁培鑫; 程树康
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2012-07-31
Filing date: 2012-07-31
Publication date: 2012-11-28

Abstract

The invention discloses a low-inductance low loss PMSM, and relates to the technical field of low-inductance low loss PMSM with a novel structure. Objective of the invention is to solve a problem that a motor in the prior art generates excessive inductance which is against high rotating speed operation of the motor, and hence generates iron core material magnetic saturation, thereby increasing iron core loss. The invention provides the low-inductance low loss PMSM, comprising a rotating shaft (1), a p-m rotor (2), a stator (3), an upper end cover (4), a lower end cover (5), a bearing (6), and a housing (7). The p-m rotor (2) comprises a rotor iron core (21) and a permanent magnet (22). The stator (3) comprises a stator iron core (31), and single-phase or polyphase stator windings (32) are radially winded on the stator iron core (31). The stator windings (32) are arranged toroidally, and each phase winding comprises a pair or a plurality of pairs of two adjacent coils. A distance between the two adjacent coils is a polar distance and the two adjacent coils are winded in opposite winding directions. The low-inductance low loss PMSM can be used in a plurality of different flywheel energy storage occasions.

Description

A kind of low inductance low consumption permanent magnetism synchronous machine

Technical field

A kind of low inductance low consumption permanent magnetism synchronous machine of the present invention relates to a kind of technical field of low inductance low consumption permanent magnetism synchronous machine of new construction.

Background technology

Energy problem is 21 century one of human key subjects that faced, when continually developing new forms of energy, in order more effectively to utilize advanced power-saving technology and the energy storage technology of existing energy needs development.In that flywheel energy storage among the energy storage technology is high with energy density, power density is big, energy conversion rate is high (about more than 90%), long service life, charging interval are short, adapt to various environment, can repeat deep discharge; Safeguard that simply it also is the focus of Recent study that advantages such as environmental protection have the while that has a extensive future.Wherein motor/generator is its core component of accomplishing power conversion, also is the key that realizes mechanical energy and electric energy conversion.Just because of the These characteristics of flywheel makes fly wheel system very high to the dynamoelectric machine system requirements; Need fly-wheel motor to have the higher speed of service; The range of speeds of broad, extremely low no-load loss, characteristics such as high conversion rate; The problem that generally runs at present is owing to produce that inductance is too high to be unfavorable for the high rotating speed operation of motor, thereby and therefore produces core material magnetic saturation increase core loss.

Summary of the invention

Move owing to producing the too high high rotating speed of motor that is unfavorable for of inductance for solving the prior art motor; Therefore thereby and produce the core material magnetic saturation and increase core loss; The present invention provides a kind of low inductance low consumption permanent magnetism synchronous machine, and this motor comprises rotating shaft, p-m rotor, stator, upper end cover, bottom end cover, bearing, housing, it is characterized in that said p-m rotor comprises rotor core and permanent magnet; Permanent magnet comprises a plurality of N, the S utmost point; Said N, the S utmost point are staggered or same polarity disposes in opposite directions, and permanent magnet places the rotor core surface or is built among the rotor core, and said stator comprises stator core; Radially twine single-phase or multi phase stator winding in the stator core; Stator winding is that hoop is arranged, and every phase winding comprises one or more pairs of two adjacent coils in the stator winding, and two adjacent coils apart are that a pole span and winding direction are opposite.

Referring to Fig. 9 operation principle of the present invention is described:

As shown in Figure 9, permanent magnet is placed under the coil considering bifilar winding split, and the supposition permanent magnet moves to left.If loop A B and A1B1 are closed; Then in coil AB, produce the electric current of A, and in iron core, produce magnetic flux (left dotted arrow among the figure) from left to right, in coil A1B1, produce the electric current of A1 to the B1 direction to the B direction; And in iron core, produce magnetic flux (figure right-of-center in political views dotted arrow) from right to left; If the B in two coils end and B1 end are joined then in new coil AA1 the sense of current from A to A1, and the total magnetic flux of loop A A1 reduces greatly owing to cancel each other, and then makes that loop A A1 inductance is extremely low; Iron core can not produce saturated phenomenon owing to electric current among the loop A A1 increases simultaneously, thereby has reduced core loss.The principle of this moment is similar to the generating state of permagnetic synchronous motor, and therefore design has feasibility based on the low iron loss magneto of the low inductance on this principle.

The invention has the beneficial effects as follows and propose a kind of low inductance low consumption permanent magnetism synchronous machine; Make the magnetic flux that produces by electric current in the armature effectively offset through reasonable disposition winding and design magnetic structure, can obtain extremely low inductance on the one hand and make motor be easier to high rotating speed operation; Thereby can reduce the core material magnetic saturation on the other hand and obtain extremely low core loss.The scheme that the present invention proposes helps to improve flywheel energy storage system and use high rotating speed, low-loss, and the performance of high efficiency electric has important theory value and realistic meaning to the research and development of the low inductance low consumption permanent magnetism synchronous machine of this new construction.

Description of drawings

Fig. 1 is the axial sectional structure sketch map of the motor of embodiment one; Fig. 2 is the sectional structure sketch map along A-A direction among Fig. 1 of the motor of embodiment one; Fig. 3 is the winding syndeton sketch map of the motor of embodiment one; Fig. 4 is motor and structural representation Fig. 2 co-located of embodiment two; Fig. 5 be embodiment three the structural representation of motor; Fig. 6 is the sectional structure sketch map of B-B direction of the motor of execution mode three; Fig. 7 is the sectional structure sketch map of C-C direction of the motor of execution mode three, and Fig. 8 is the structural representation of the motor of embodiment four.Fig. 9 is an operation principle sketch map of the present invention.

Embodiment

Specify execution mode of the present invention below in conjunction with Fig. 1 to Fig. 8.

Embodiment one: like Fig. 1, shown in Figure 2; A kind of low inductance low consumption permanent magnetism synchronous machine comprises rotating shaft 1, p-m rotor 2, stator 3, upper end cover 4, bottom end cover 5, bearing 6, housing 7, it is characterized in that said p-m rotor 2 comprises rotor core 21 and permanent magnet 22; Permanent magnet 22 comprises a plurality of N, the S utmost point; Said N, the S utmost point are staggered or same polarity disposes in opposite directions, and permanent magnet 22 places rotor core 21 surfaces or is built among the rotor core 21, and said stator 3 comprises stator core 31; Radially twine single-phase or multi phase stator winding 32 in the stator core 31; Stator winding 32 is arranged for hoop, and every phase winding comprises one or more pairs of two adjacent coils in the stator winding 32, and two adjacent coils apart are that a pole span and winding direction are opposite.Stator core 31 is to be formed by silicon steel plate packing, and stator core 31 is the donut structure, and stator core 31 can be a notching construction.

As shown in Figure 3.When motor uses as motor, pass to electric current in the winding, perhaps use when electric current is sent in load as generator; The flow direction that armature supply produces in armature core under the opposed polarity is opposite; If opposed polarity coil down has the identical number of turn, the magnetic flux equal and opposite in direction of generation and in the opposite direction then, and then the magnetic flux that armature supply produces in this phase winding is cancelled out each other; The total magnetic flux that armature supply produces at armature core under the ideal situation is zero, can obtain extremely low every phase inductance.Thereby armature core can not produce the saturated loss that reduces stator core effectively owing to the increase of electric current under the situation of load variations simultaneously.

Embodiment two: as shown in Figure 4; This execution mode is that with execution mode one difference p-m rotor 2 comprises inside and outside two rotors; Internal rotor comprises internal rotor unshakable in one's determination 211 and internal rotor permanent-magnetic body 221; External rotor comprises external rotor unshakable in one's determination 212 and external rotor permanent magnet body 222, and inner and outer rotors has identical number of poles, and stator 3 is between internal rotor and external rotor.Stator winding is identical with execution mode one, and this execution mode utilizes stator internal layer and outer winding can effectively improve motor torque except that the characteristics with execution mode one simultaneously.

Embodiment three: like Fig. 5, Fig. 6, shown in Figure 7; This execution mode is that with above execution mode difference rotor core 21 is disk structure; Stator 3 is axial arranged with rotor 2, and stator core 31 is rolled by silicon steel sheet and forms, and stator core 31 is the donut structure.It is identical with execution mode one to be equipped with stator winding 32 its canoes and arranging rule in the stator core.Rotor field and stator current interact and produce torque, and the arrangement mode of winding makes motor have extremely low inductance and lower core loss simultaneously.

Embodiment four: as shown in Figure 8, this execution mode is that with execution mode three differences motor p-m rotor 2 quantity are a plurality of, axially connects between all p-m rotors 2, between per two adjacent p-m rotors 2 stator 3 is set.Remove right ends portion place's rotor single face and stator effect; Center roller interacts with the stator on its both sides respectively; The bilateral also while of stator winding interacts with the rotor field on both sides; Each unit is identical with execution mode three, and different units axially connects to satisfy different power demand and different torque-demands, and this execution mode possesses the advantage of execution mode one simultaneously.

Claims

1. one kind low inductance low consumption permanent magnetism synchronous machine; Comprise rotating shaft (1), p-m rotor (2), stator (3), upper end cover (4), bottom end cover (5), bearing (6), housing (7); It is characterized in that said p-m rotor (2) comprises rotor core (21) and permanent magnet (22), permanent magnet (22) comprises a plurality of N, the S utmost point, and said N, the S utmost point are staggered or same polarity disposes in opposite directions; Permanent magnet (22) places rotor core (21) surface or is built among the rotor core (21); Said stator (3) comprises stator core (31), radially twines single-phase in the stator core (31) or multi phase stator winding (32), and stator winding (32) is arranged for hoop; Every phase winding comprises one or more pairs of two adjacent coils in the stator winding (32), and two adjacent coils apart are that a pole span and winding direction are opposite.

2. low inductance low consumption permanent magnetism synchronous machine as claimed in claim 1, it is characterized in that: said stator core (31) is to be formed by silicon steel plate packing, stator core (31) is the donut structure.

3. low inductance low consumption permanent magnetism synchronous machine as claimed in claim 2, it is characterized in that: said stator core (31) is a notching construction.

4. low inductance low consumption permanent magnetism synchronous machine as claimed in claim 1; It is characterized in that: said p-m rotor (2) comprises inside and outside two rotors; Internal rotor comprises internal rotor (211) and internal rotor permanent-magnetic body (221) unshakable in one's determination; External rotor comprises external rotor (212) and external rotor permanent magnet body (222) unshakable in one's determination, and inner and outer rotors has identical number of poles, and stator (3) is between internal rotor and external rotor.

5. low inductance low consumption permanent magnetism synchronous machine as claimed in claim 1; It is characterized in that: said rotor core (21) is disk structure; Stator (3) is axial arranged with rotor (2), and stator core (31) is rolled by silicon steel sheet and forms, and stator core (31) is the donut structure.

6. low inductance low consumption permanent magnetism synchronous machine as claimed in claim 5; It is characterized in that: said p-m rotor (2) quantity is a plurality of; Axially connect between all p-m rotors (2), a stator (3) is set between per two adjacent p-m rotors (2).