CN109902445B - Peak torque simulation test method and system for IPM permanent magnet motor - Google Patents
Peak torque simulation test method and system for IPM permanent magnet motor Download PDFInfo
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Abstract
The invention relates to a peak torque simulation test method and a simulation test system of an IPM permanent magnet motor, wherein the method comprises the following steps: providing a virtual IPM permanent magnet motor; testing the initial torque of the virtual IPM permanent magnet motor under the condition that the torque angle is 0; gradually increasing the torque angle according to the preset torque angle step length, and testing the increasing torque of the virtual IPM permanent magnet motor under the torque angle after each increasing; and when the nth incremental torque is smaller than the (n-1) th incremental torque, selecting the maximum torque between the nth incremental torque and the (n-1) th incremental torque as the peak torque of the virtual IPM permanent magnet motor by gradually adjusting the incremental torque angle of the virtual IPM permanent magnet motor between the nth incremental torque angle and the (n-1) th incremental torque angle. The method does not need to test, and the peak torque of the IPM permanent magnet motor is accurately obtained by utilizing a simulation technology, so that help is provided for early development and test evaluation of the IPM permanent magnet motor.
Description
Technical Field
The invention relates to the technical field of IPM permanent magnet motors, in particular to a peak torque simulation test method and a peak torque simulation test system of an IPM permanent magnet motor.
Background
At present, a motor is widely used in places such as transportation, industry, aviation and the like as an energy conversion tool, and becomes an indispensable part of national modernization construction, and with an increasingly severe energy policy, development of a high-performance and low-cost motor is urgently needed.
In particular, in the field of automobile driving motors, IPM (interior permanent magnet) motors are widely used due to their high efficiency and excellent speed regulation performance, and for example, IPM has a higher torque output capability because it can provide a partial reluctance torque at the same unit current as compared with SPM (surface-mounted permanent magnet) motors.
Meanwhile, there is a technical requirement for the peak torque of the IPM motor according to the actual requirements of the automobile, and therefore, after the IPM motor is developed, the peak torque of the IPM motor needs to be tested.
At present, the peak torque of the IPM motor needs to be obtained through test, so that the development period is prolonged, the manufacturing cost is increased, and time and labor are wasted.
Therefore, the peak torque simulation test method and the peak torque simulation test system for the IPM permanent magnet motor are provided.
Disclosure of Invention
In view of the above problems, the present invention is proposed to provide a peak torque simulation test method and a peak torque simulation test system for IPM permanent magnet motor, which overcome the above problems or at least partially solve the above problems, and solve the problems of long development period, high manufacturing cost, time consuming and labor consuming in actual tests by using simulation technology.
According to an aspect of the present invention, a peak torque simulation test method for an IPM permanent magnet machine is provided, including:
providing a virtual IPM permanent magnet motor;
testing the initial torque of the virtual IPM permanent magnet motor under the condition that the torque angle is 0;
gradually increasing the torque angle according to the preset torque angle step length, and testing the increasing torque of the virtual IPM permanent magnet motor under the torque angle after each increasing;
and when the nth incremental torque is smaller than the (n-1) th incremental torque, selecting the maximum torque between the nth incremental torque and the (n-1) th incremental torque as the peak torque of the virtual IPM permanent magnet motor by gradually adjusting the incremental torque angle of the virtual IPM permanent magnet motor between the nth incremental torque angle and the (n-1) th incremental torque angle.
Further, the peak torque simulation test method for the IPM permanent magnet motor further includes:
when the nth incremental torque is smaller than the (n-1) th incremental torque, acquiring an intermediate incremental torque angle between the nth incremental torque angle and the (n-1) th incremental torque angle, and testing the intermediate incremental torque of the virtual IPM permanent magnet motor under the intermediate incremental torque angle;
judging whether the intermediate incremental torque is larger than the nth incremental torque or not;
if the intermediate incremental torque is larger than the nth incremental torque, acquiring a secondary intermediate incremental torque angle between the intermediate incremental torque angle and the (n-1) th incremental torque angle, testing the secondary intermediate incremental torque of the virtual IPM permanent magnet motor under the secondary intermediate incremental torque angle, and judging whether the secondary intermediate incremental torque is larger than the intermediate incremental torque or not until the maximum torque between the intermediate incremental torque and the secondary intermediate incremental torque is found out.
Further, the peak torque simulation test method for the IPM permanent magnet motor further includes: when the absolute value of the difference between the adjacent torques corresponding to the adjacent torque angles is smaller than a preset value, the average value of the adjacent torques is the maximum torque.
Further, a virtual IPM permanent magnet motor is constructed according to the actual IPM permanent magnet motor parameters by adopting a finite element technology.
Further, the actual IPM permanent magnet machine parameters include winding wire diameter, number of turns, number of parallel branches, core length, winding end length of the IPM permanent magnet machine, and resistance value and reactance value of the IPM permanent magnet machine obtained based on the winding wire diameter, number of turns, number of parallel branches, core length, and winding end length of the actual IPM permanent magnet machine.
According to another aspect of the present invention, there is provided a peak torque simulation test system for an IPM permanent magnet machine, comprising:
a virtual IPM PMM storage module for providing a virtual IPM PMM;
the virtual IPM permanent magnet motor operation simulation module is used for testing the initial torque of the virtual IPM permanent magnet motor under the condition that the torque angle is 0, gradually increasing the torque angle according to the preset torque angle step length, and testing the increasing torque of the virtual IPM permanent magnet motor under the torque angle after each increasing;
and the peak torque testing module is used for selecting the maximum torque between the nth incremental torque and the (n-1) th incremental torque as the peak torque of the virtual IPM permanent magnet motor by gradually adjusting the incremental torque angle of the virtual IPM permanent magnet motor between the nth incremental torque angle and the (n-1) th incremental torque angle when the nth incremental torque is smaller than the (n-1) th incremental torque.
Further, the peak torque testing module is further configured to:
obtaining an intermediate incremental torque angle between the nth incremental torque angle and the (n-1) th incremental torque angle, and testing the intermediate incremental torque of the virtual IPM permanent magnet motor under the intermediate incremental torque angle;
judging whether the intermediate incremental torque is larger than the nth incremental torque or not;
if the intermediate incremental torque is larger than the nth incremental torque, acquiring a secondary intermediate incremental torque angle between the intermediate incremental torque angle and the nth-1 incremental torque angle, testing the secondary intermediate incremental torque of the virtual IPM permanent magnet motor under the secondary intermediate incremental torque angle, and judging whether the secondary intermediate incremental torque is larger than the intermediate incremental torque or not until finding out the maximum torque between the intermediate incremental torque and the secondary intermediate incremental torque.
Further, the peak torque testing module is further configured to:
when the absolute value of the difference between the adjacent torques corresponding to the adjacent torque angles is smaller than a preset value, the average value of the adjacent torques is the maximum torque.
Further, the peak torque simulation test system for the IPM permanent magnet motor further includes: and the virtual IPM permanent magnet motor construction module is used for constructing the virtual IPM permanent magnet motor according to the actual IPM permanent magnet motor parameters by adopting a finite element technology.
Further, in the virtual IPM permanent magnet machine construction module, the actual IPM permanent magnet machine parameters include winding wire diameter, number of turns, number of parallel branches, core length, winding end length of the IPM permanent magnet machine, and resistance value and reactance value of the IPM permanent magnet machine obtained based on the winding wire diameter, number of turns, number of parallel branches, core length, and winding end length of the actual IPM permanent magnet machine.
Compared with the prior art, the invention has the following advantages:
the peak torque simulation test method and the peak torque simulation test system for the IPM permanent magnet motor do not need to be tested, accurately obtain the peak torque of the IPM permanent magnet motor by utilizing a simulation technology, and provide help for early development and test evaluation of the IPM permanent magnet motor.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a diagram of steps of a peak torque simulation test method for an IPM permanent magnet machine of the present invention;
FIG. 2 is a schematic of the maximum torque lookup of the present invention;
FIG. 3 is a schematic illustration of a torque angle lookup corresponding to maximum torque according to the present invention;
fig. 4 is a block diagram of a peak torque simulation test system of the IPM permanent magnet machine of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a step diagram of a peak torque simulation test method of an IPM permanent magnet machine of the present invention, and referring to fig. 1, the peak torque simulation test method of an IPM permanent magnet machine provided by the present invention includes:
s1, providing a virtual IPM permanent magnet motor;
s2, testing the initial torque of the virtual IPM permanent magnet motor under the condition that the torque angle is 0;
s3, gradually increasing the torque angle according to the preset torque angle step length, and testing the increasing torque of the virtual IPM permanent magnet motor under the torque angle after each increasing;
and S4, when the nth incremental torque is smaller than the (n-1) th incremental torque, selecting the maximum torque between the nth incremental torque and the (n-1) th incremental torque as the peak torque of the virtual IPM permanent magnet motor by gradually adjusting the incremental torque angle of the virtual IPM permanent magnet motor between the nth incremental torque angle and the (n-1) th incremental torque angle.
Specifically, assuming the predetermined torque angle step is θ, the 1 st incremental torque angle is θ and the 1 st incremental torque is T θ . θ may be 1 °.
And testing the torque of the virtual IPM permanent magnet motor under different torque angles. Setting 0 torque angleMoment of T 0 At a certain moment after the motor operates stably, sequentially increasing a torque angle theta from a 0 torque angular point:
if the torque value T is obtained at 0+ theta θ Greater than T 0 Then take 0+2 theta as torque angle and obtain torque value T 2θ ；
Torque value T if at 0+2 theta 2θ Greater than T θ Then take 0+3 theta as torque angle and obtain torque value T 3θ ；
If torque T is obtained at the torque angle of 0+3 theta 3θ Greater than T 2θ Then take 0 to 4 theta as torque angle and obtain torque value T 4θ ，
……
If torque T is obtained at the torque angle of 0+n theta nθ Less than T (n-1)θ Then at T nθ And T (n-1)θ The maximum torque is selected.
The peak torque simulation test method of the IPM permanent magnet motor does not need to test, accurately obtains the peak torque of the IPM permanent magnet motor by utilizing a simulation technology, and provides help for early development and test evaluation of the IPM permanent magnet motor.
Further, the peak torque simulation test method for the IPM permanent magnet motor further includes:
when the nth incremental torque is smaller than the (n-1) th incremental torque, acquiring an intermediate incremental torque angle between the nth incremental torque angle and the (n-1) th incremental torque angle, and testing the intermediate incremental torque of the virtual IPM permanent magnet motor under the intermediate incremental torque angle;
judging whether the intermediate incremental torque is larger than the nth incremental torque or not;
if the intermediate incremental torque is larger than the nth incremental torque, acquiring a secondary intermediate incremental torque angle between the intermediate incremental torque angle and the nth-1 incremental torque angle, testing the secondary intermediate incremental torque of the virtual IPM permanent magnet motor under the secondary intermediate incremental torque angle, and judging whether the secondary intermediate incremental torque is larger than the intermediate incremental torque or not until finding out the maximum torque between the intermediate incremental torque and the secondary intermediate incremental torque.
Specifically, referring to FIGS. 2 and 3, when n =2, it is at 0+2 θObtaining a torque value T 2θ Less than T θ Then take 0 to 3 theta/2 as torque angle and obtain the torque value T 3θ/2 (ii) a Judgment of T 3θ/2 Whether or not it is greater than T 2θ ；
If T 3θ/2 Greater than T 2θ Taking (theta +3 theta/2)/2 as a torque angle and obtaining a torque value T 5θ/4 (ii) a Judgment of T 5θ/4 Whether or not greater than T 3θ/2 Until at T 5θ/4 And T 3θ/2 Find the maximum torque in between.
In essence, the principle of finding the maximum torque is: and taking the middle value of the torque angle corresponding to the two torque values with the maximum torque values in the three adjacent torque angles as a new torque angle until the maximum torque angle is found.
The invention utilizes the above half-folding method to quickly simulate the critical point when the torque is maximum, thereby saving time and having good efficiency.
Further, the peak torque simulation test method for the IPM permanent magnet motor further includes: when the absolute value of the difference between the adjacent torques corresponding to the adjacent torque angles is smaller than a preset value, the average value of the adjacent torques is the maximum torque.
Specifically, the preset value is determined according to the actual working condition of the IPM permanent magnet motor. When the IPM permanent magnet machine is an 8-stage machine, operating at 40kw power and rotating at 1500 rpm, the torque T is 9.55P/N =9.55 x 40 x 1000/1500N · m =255N · m, the preset value is usually 0.2% to 0.5% of the torque, and therefore the current preset value is 0.5 to 1.3.
Further, a virtual IPM permanent magnet motor is constructed according to the actual IPM permanent magnet motor parameters by adopting a finite element technology. The actual IPM permanent magnet motor parameters comprise the winding wire diameter, the number of turns, the number of parallel branches, the length of an iron core and the length of a winding end part of the IPM permanent magnet motor, and the resistance value and the reactance value of the IPM permanent magnet motor are obtained based on the winding wire diameter, the number of turns, the number of parallel branches, the length of the iron core and the length of the winding end part of the actual IPM permanent magnet motor.
The virtual IPM permanent magnet motor is constructed by adopting a finite element technology according to actual IPM permanent magnet motor parameters and is specifically implemented as follows:
the method comprises the steps of establishing a virtual IPM permanent magnet motor through ANSOFT RMxprt software according to the winding wire diameter, the number of turns, the number of parallel branches, the length of an iron core and the length of a winding end part of an actual IPM permanent magnet motor, obtaining the resistance value and the reactance value of the IPM permanent magnet motor through the winding wire diameter, the number of turns, the number of parallel branches, the length of the iron core and the length of the winding end part of the actual IPM permanent magnet motor, and adding a current excitation source and necessary auxiliary conditions, namely adding a sinusoidal current excitation source, grid division and boundary conditions. In particular, the rotor pole center line in the Maxwell2D model coincides with the a-phase winding axis. The virtual IPM permanent magnet motor has two construction methods: the method comprises the following steps of (1) modeling and importing through 2D drawing software of Maxwell software; (2) And the virtual IPM permanent magnet motor is automatically generated by combining ANSOFT RMXPRT software and Maxwell.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the embodiments of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Fig. 4 is a block diagram of a peak torque simulation test system of an IPM permanent magnet machine of the present invention, and referring to fig. 4, the peak torque simulation test system of an IPM permanent magnet machine provided by the present invention includes:
a virtual IPM PMM storage module for providing a virtual IPM PMM;
the virtual IPM permanent magnet motor operation simulation module is used for testing the initial torque of the virtual IPM permanent magnet motor under the condition that the torque angle is 0, gradually increasing the torque angle according to the preset torque angle step length, and testing the increasing torque of the virtual IPM permanent magnet motor under the torque angle after each increasing;
and the peak torque testing module is used for selecting the maximum torque between the nth incremental torque and the (n-1) th incremental torque as the peak torque of the virtual IPM permanent magnet motor by gradually adjusting the incremental torque angle of the virtual IPM permanent magnet motor between the nth incremental torque angle and the (n-1) th incremental torque angle when the nth incremental torque is smaller than the (n-1) th incremental torque.
Further, the peak torque testing module is further configured to:
obtaining an intermediate incremental torque angle between the nth incremental torque angle and the (n-1) th incremental torque angle, and testing the intermediate incremental torque of the virtual IPM permanent magnet motor under the intermediate incremental torque angle;
judging whether the intermediate incremental torque is larger than the nth incremental torque or not;
if the intermediate incremental torque is larger than the nth incremental torque, acquiring a secondary intermediate incremental torque angle between the intermediate incremental torque angle and the nth-1 incremental torque angle, testing the secondary intermediate incremental torque of the virtual IPM permanent magnet motor under the secondary intermediate incremental torque angle, and judging whether the secondary intermediate incremental torque is larger than the intermediate incremental torque or not until finding out the maximum torque between the intermediate incremental torque and the secondary intermediate incremental torque.
Further, the peak torque testing module is further configured to:
when the absolute value of the difference between the adjacent torques corresponding to the adjacent torque angles is smaller than a preset value, the average value of the adjacent torques is the maximum torque.
Further, the peak torque simulation test system for the IPM permanent magnet motor further includes: and the virtual IPM permanent magnet motor construction module is used for constructing the virtual IPM permanent magnet motor according to the actual IPM permanent magnet motor parameters by adopting a finite element technology.
Further, in the virtual IPM permanent magnet machine construction module, the actual IPM permanent magnet machine parameters include winding wire diameter, number of turns, number of parallel branches, core length, winding end length of the IPM permanent magnet machine, and resistance value and reactance value of the IPM permanent magnet machine obtained based on the winding wire diameter, number of turns, number of parallel branches, core length, and winding end length of the actual IPM permanent magnet machine.
The peak torque simulation test system of the IPM permanent magnet motor does not need to be tested, accurately obtains the peak torque of the IPM permanent magnet motor by utilizing a simulation technology, and provides help for early development and test evaluation of the IPM permanent magnet motor.
For the system embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A peak torque simulation test method of an IPM permanent magnet motor is characterized by comprising the following steps:
providing a virtual IPM permanent magnet machine;
testing the initial torque of the virtual IPM permanent magnet motor under the torque angle of 0;
gradually increasing the torque angle according to the preset torque angle step length, and testing the increasing torque of the virtual IPM permanent magnet motor under the torque angle after each increasing;
and when the nth incremental torque is smaller than the (n-1) th incremental torque, selecting the maximum torque between the nth incremental torque and the (n-1) th incremental torque as the peak torque of the virtual IPM permanent magnet motor by gradually adjusting the incremental torque angle of the virtual IPM permanent magnet motor between the nth incremental torque angle and the (n-1) th incremental torque angle.
2. The peak torque simulation test method of an IPM permanent magnet machine according to claim 1, further comprising:
when the nth incremental torque is smaller than the (n-1) th incremental torque, acquiring an intermediate incremental torque angle between the nth incremental torque angle and the (n-1) th incremental torque angle, and testing the intermediate incremental torque of the virtual IPM permanent magnet motor under the intermediate incremental torque angle;
judging whether the intermediate incremental torque is larger than the nth incremental torque or not;
if the intermediate incremental torque is larger than the nth incremental torque, acquiring a secondary intermediate incremental torque angle between the intermediate incremental torque angle and the (n-1) th incremental torque angle, testing the secondary intermediate incremental torque of the virtual IPM permanent magnet motor under the secondary intermediate incremental torque angle, and judging whether the secondary intermediate incremental torque is larger than the intermediate incremental torque or not until the maximum torque between the intermediate incremental torque and the secondary intermediate incremental torque is found out.
3. The peak torque simulation test method of the IPM permanent magnet machine according to claim 2, further comprising: when the absolute value of the difference between the adjacent torques corresponding to the adjacent torque angles is smaller than a preset value, the average value of the adjacent torques is the maximum torque.
4. The peak torque simulation testing method of IPM permanent magnet machine according to claim 3, wherein a virtual IPM permanent magnet machine is constructed according to actual IPM permanent magnet machine parameters by using finite element technique.
5. The peak torque simulation test method for the IPM permanent magnet machine according to claim 4, wherein the actual IPM permanent magnet machine parameters include winding wire diameter, number of turns, number of parallel branches, core length, winding end length of the IPM permanent magnet machine, and resistance value and reactance value of the IPM permanent magnet machine obtained based on the winding wire diameter, number of turns, number of parallel branches, core length, winding end length of the actual IPM permanent magnet machine.
6. A peak torque simulation test system of an IPM permanent magnet motor is characterized by comprising:
the virtual IPM permanent magnet motor storage module is used for providing a virtual IPM permanent magnet motor;
the virtual IPM permanent magnet motor operation simulation module is used for testing the initial torque of the virtual IPM permanent magnet motor under the condition that the torque angle is 0, gradually increasing the torque angle according to the preset torque angle step length, and testing the increasing torque of the virtual IPM permanent magnet motor under the torque angle after each increasing;
and the peak torque testing module is used for selecting the maximum torque between the nth incremental torque and the (n-1) th incremental torque as the peak torque of the virtual IPM permanent magnet motor by gradually adjusting the incremental torque angle of the virtual IPM permanent magnet motor between the nth incremental torque angle and the (n-1) th incremental torque angle when the nth incremental torque is smaller than the (n-1) th incremental torque.
7. The peak torque simulation test system for an IPM permanent magnet machine of claim 6, wherein the peak torque test module is further configured to:
acquiring an intermediate incremental torque angle between the nth incremental torque angle and the (n-1) th incremental torque angle, and testing the intermediate incremental torque of the virtual IPM permanent magnet motor under the intermediate incremental torque angle;
judging whether the intermediate incremental torque is larger than the nth incremental torque or not;
if the intermediate incremental torque is larger than the nth incremental torque, acquiring a secondary intermediate incremental torque angle between the intermediate incremental torque angle and the nth-1 incremental torque angle, testing the secondary intermediate incremental torque of the virtual IPM permanent magnet motor under the secondary intermediate incremental torque angle, and judging whether the secondary intermediate incremental torque is larger than the intermediate incremental torque or not until finding out the maximum torque between the intermediate incremental torque and the secondary intermediate incremental torque.
8. The peak torque simulation test system for an IPM permanent magnet machine of claim 7, wherein the peak torque test module is further configured to:
when the absolute value of the difference between the adjacent torques corresponding to the adjacent torque angles is smaller than a preset value, the average value of the adjacent torques is the maximum torque.
9. The peak torque simulation test system for an IPM permanent magnet machine according to claim 8, further comprising: and the virtual IPM permanent magnet motor construction module is used for constructing the virtual IPM permanent magnet motor according to the actual IPM permanent magnet motor parameters by adopting a finite element technology.
10. The peak torque simulation test system for the IPM permanent magnet machine according to claim 9, wherein in the virtual IPM permanent magnet machine construction module, the actual IPM permanent magnet machine parameters include winding wire diameter, number of turns, number of parallel branches, core length, winding end length of the IPM permanent magnet machine, and resistance value and reactance value of the IPM permanent magnet machine obtained based on the winding wire diameter, number of turns, number of parallel branches, core length, and winding end length of the actual IPM permanent magnet machine.
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