SRM Direct Instantaneous Torque Control Method for Dynamic Adjustment of DC Bus Voltage

A technology of DC bus voltage and instantaneous torque, applied in AC motor control, motor control, conversion of DC power input to DC power output, etc., can solve problems such as torque ripple, reduce torque ripple and increase single-phase conduction. time, the effect of reducing torque error

Active Publication Date: 2021-05-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And when running at high speed, the reduction of motor demagnetization time may extend the phase current to the negative torque area, resulting in torque ripple

Method used

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  • SRM Direct Instantaneous Torque Control Method for Dynamic Adjustment of DC Bus Voltage
  • SRM Direct Instantaneous Torque Control Method for Dynamic Adjustment of DC Bus Voltage
  • SRM Direct Instantaneous Torque Control Method for Dynamic Adjustment of DC Bus Voltage

Examples

Experimental program
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Embodiment

[0141] This embodiment provides a method for direct instantaneous torque control of switched reluctance motors with dynamic adjustment of DC bus voltage. The specific implementation steps are as follows:

[0142] Step 1: Establish a current-position-torque model

[0143] Carry out finite element analysis according to the parameters of the switched reluctance motor body, or measure part of the current-position-flux linkage curve of the switched reluctance motor according to the experiment, and then use the Fourier series fitting method or use the support vector machine method and neural network Methods etc. to obtain the complete current-position-flux linkage curve, and obtain the electromagnetic torque of the switched reluctance motor after calculation, and establish the current-position-torque model.

[0144] For example, using experiments to measure the current-position-flux linkage curves of three-phase 12 / 8 switched reluctance motors at 0°, 7.5°, 15°, and 22.5°, the comple...

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Abstract

The invention relates to an SRM direct instantaneous torque control method for dynamic adjustment of DC bus voltage. The method adds a DC-DC conversion circuit at the front end of a traditional asymmetrical half-bridge power converter, and decouples the excitation path and the demagnetization path, and can apply more The high demagnetization voltage makes the winding of the switched reluctance motor demagnetize faster. According to the different operating speeds of the switched reluctance motor, the DC bus voltage of the power converter is adjusted accordingly, and the adjustment method has an optimized opening angle. Features: The commutation rule of the switched reluctance motor is improved, and the commutation conduction zone performs direct instantaneous torque control through a higher demagnetization voltage to reduce torque ripple while taking into account the optimal opening angle characteristics; the switched reluctance motor In the operating range of full speed, the torque ripple is reduced by a control strategy of direct instantaneous torque control without switching control strategy.

Description

technical field [0001] The invention relates to the field of motor drive technology control, in particular to a direct instantaneous torque control method of a switched reluctance motor (SRM) for dynamic adjustment of DC bus voltage. Background technique [0002] The structure of the switched reluctance motor is simple, there is no winding on the rotor, the mechanical strength of the motor itself is high, and it can be used for frequent start-stop or ultra-high-speed operation. At the same time, due to the special double salient pole structure and winding conduction mode of the switched reluctance motor, large torque fluctuations will be generated during the operation of the motor. Common torque ripple suppression methods include indirect torque control method and direct torque control method. The indirect torque control method indirectly controls the output torque of the motor within the desired range through the relationship between torque, current and flux linkage, and b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P25/086H02P25/092H02P25/098H02M3/00
CPCH02M3/005H02P25/086H02P2205/01H02P2205/05H02P2205/07H02P25/092H02P25/098
Inventor 孙鹤旭高爽董砚荆锴
Owner HEBEI UNIV OF TECH
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