SRM direct instantaneous torque control method for DC bus voltage dynamic adjustment

A technology of DC bus voltage and instantaneous torque, applied in AC motor control, motor control, DC power input conversion to DC power output, etc., can solve problems such as torque ripple

Active Publication Date: 2020-05-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And when running at high speed, the reduction of motor demagnetization time may

Method used

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  • SRM direct instantaneous torque control method for DC bus voltage dynamic adjustment
  • SRM direct instantaneous torque control method for DC bus voltage dynamic adjustment
  • SRM direct instantaneous torque control method for DC bus voltage dynamic adjustment

Examples

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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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PUM

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Abstract

The invention relates to an SRM direct instantaneous torque control method for DC bus voltage dynamic adjustment. According to the method, a DC-DC conversion circuit is added to the front end of a traditional asymmetric half-bridge power converter; an excitation path and a demagnetization path are decoupled, and a higher demagnetization voltage can be applied, so that the winding of the switched reluctance motor is demagnetized more quickly, corresponding buck-boost adjustment is performed on the DC bus voltage of the power converter according to different operating speeds of the switched reluctance motor, and the adjustment mode has the characteristic of opening angle optimization; the commutation rule of the switched reluctance motor is improved, and a commutation conduction region executes direct instantaneous torque control to reduce torque pulsation through higher demagnetization voltage under the condition of considering the optimal turn-on angle characteristic; in the full-rotating-speed operation range of the switched reluctance motor, a control strategy is controlled through direct instantaneous torque to reduce torque pulsation, and the control strategy does not need to be switched.

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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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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