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A Torque Ripple Suppression Method for Electrically Excited Doubly Salient Motors with 12/10 Pole Structure

A technology of electric excitation double salient pole and torque ripple, applied in torque ripple control and other directions, can solve problems such as complex methods, and achieve the effect of reducing noise and torque ripple

Active Publication Date: 2022-08-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In a permanent magnet synchronous motor (PMSM) driven by a sine wave, the basic principle of the stator current compensation method is commonly used to suppress the torque ripple, such as stator harmonic current injection, and the injected harmonic current passes through the disturbance current caused by non-ideal factors Interaction to offset the torque fluctuation of the motor, thereby reducing the speed fluctuation, the method is often complicated
At present, there is no torque ripple suppression strategy for DSEM driven by sine wave. In the simulation and experiment of DSEM driven by sine wave, it is found that there is a large 6th harmonic component in the electromagnetic torque, which is mainly due to the Caused by non-ideal factors such as high-order harmonics in the back electromotive force

Method used

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  • A Torque Ripple Suppression Method for Electrically Excited Doubly Salient Motors with 12/10 Pole Structure
  • A Torque Ripple Suppression Method for Electrically Excited Doubly Salient Motors with 12/10 Pole Structure
  • A Torque Ripple Suppression Method for Electrically Excited Doubly Salient Motors with 12/10 Pole Structure

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Embodiment 1

[0047] see Figure 1-Figure 4 This embodiment provides a torque ripple suppression method for an electrically excited doubly salient motor with a 12 / 10-pole structure, including: driving the electrically excited doubly salient motor with a sine wave, and when there are 5 and 7 harmonics in the back EMF , the electric excitation doubly salient output torque ripple has a fixed subharmonic;

[0048] Without changing the drive control mode of the armature winding, the output torque ripple of the electric excitation doubly salient motor is eliminated by the control method of injecting harmonics into the excitation current.

[0049] Specifically, through finite element simulation, the back EMF waveform of the electric excitation doubly salient motor with 12 / 10-pole six-phase windings in reverse series is obtained during DC excitation, such as figure 1 As shown, after the fitting process, the 5th and 7th harmonics of the main part are retained to obtain dL AF / dθ, dL BF / dθ, dL C...

Embodiment 2

[0066] see Figure 5-Figure 11 , On the basis of Embodiment 1, this embodiment provides a torque ripple suppression method for an electrically excited doubly salient motor with a 12 / 10-pole structure. The torque is 10N m, the DC component of the excitation current is 12A, and the phase current amplitude is 7.5A. In order to minimize the coefficient of the 6th harmonic component in the electromagnetic torque formula, the optimal amplitude of the injected harmonic is:

[0067]

[0068] In the excitation current formula, the default 6th harmonic is equal to the initial phase of the A-phase current. When this control method is actually used, if the two initial phases are offset, the torque ripple suppression effect will be poor or even increase the torque ripple. At the same time, there is a position sensor to obtain the real-time mechanical angular position of the motor when the sine wave is driven.

[0069] In this embodiment, the electric excitation doubly salient pole moto...

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Abstract

The invention discloses a torque pulsation suppression method for an electric excitation doubly salient motor with a 12 / 10-pole structure. When the electric excitation doubly salient output torque pulsation has a fixed sub-harmonic; without changing the armature winding drive control mode, the control method of injecting harmonics into the excitation current eliminates the electric excitation doubly salient motor Output torque ripple. The invention can effectively reduce the torque pulsation of the 12 / 10 pole structure electric excitation double salient motor in the sine wave driving mode.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a torque ripple suppression method for an electric excitation doubly salient motor with a 12 / 10-pole structure. Background technique [0002] The structure of the doubly salient motor is similar to that of the SRM. The stator and rotor of the doubly salient motor are both salient pole structures. However, unlike the SRM, the stator side of the doubly salient motor adopts permanent magnet excitation or DC winding excitation. Both can output power and improve the power density. There are no permanent magnets and windings on the rotor of the electric excitation doubly salient motor (DSEM), which has the advantages of simple structure, flexible control, good fault tolerance, and harsh working conditions. It has good application prospects in electric vehicles, aviation and other fields. Since DSEM uses DC winding excitation, the manufacturing cost of the motor is greatly reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/10
CPCH02P6/10
Inventor 魏佳丹陈锦春王艺威周波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS