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Phase current reconstruction method for switch reluctance machine based on bus current sensor

A technology of switched reluctance motor and bus current, which is applied in the direction of motor generator control, electronic commutation motor control, and generator control. Advanced problems, to achieve the effect of reducing the number of current sensors, improving motor reliability and system integration, and reducing costs

Active Publication Date: 2018-02-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the special topology of the power converter, the demagnetization current cannot be reconstructed, resulting in the incomplete reconstructed phase current, which cannot be applied to advanced control methods, such as direct instantaneous torque control
In addition, the power converter does not use a standard power switch module, and the system integration level is not high

Method used

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  • Phase current reconstruction method for switch reluctance machine based on bus current sensor
  • Phase current reconstruction method for switch reluctance machine based on bus current sensor
  • Phase current reconstruction method for switch reluctance machine based on bus current sensor

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Embodiment Construction

[0028] The modular power converter of the present invention is such as figure 1 As shown, the modular power converter consists of a three-phase full-bridge switch module and a half-bridge switch module; the three-phase full-bridge switch module includes No. 1 to No. 6 switch tubes T1 to T6, and No. 1 to No. 6 diodes D1 to D6; The switch tubes T1, T3, T5 and the diodes D1, D3 and D5 respectively form three upper bridge arms. The switch tubes T2, T4, T6 and the diodes D2, D4 and D6 respectively form three lower bridge arms; the half-bridge switch module includes seven No. 8 switch tube T7, No. 8 switch tube T8, No. 7 diode D7 and No. 8 diode D8, switch tube T7 and diode D7 form an upper bridge arm, switch tube T8 and diode D8 form a lower bridge arm; three-phase full bridge switch Each upper bridge arm of the module and half-bridge switch module is connected to the positive end of the DC power supply, and the lower bridge arm is connected to the negative end of the DC power suppl...

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Abstract

The invention discloses a phase current reconstruction method for a switch reluctance machine based on a bus current sensor. A modular power converter in a switch reluctance machine drive system consists of one three-phase full-bridge switching module and one half-bridge switch module, wherein a motor winding is in star-shaped connection and a central line is led out. The method just needs one buscurrent sensor, and achieves the phase current reconstruction through the injection of a PWM signal into a switching tube and the decoupling of a bus current. The method can obtain a complete phase current waveform, and reduces the number of current sensors and the number of analog-digital converter channels. The employed modular power sensor facilitates the reduction of the cost of the drive system and the improvement of the integration degree and reliability of the system.

Description

Technical field [0001] The invention relates to a phase current reconstruction method of a switched reluctance motor based on a bus current sensor, which belongs to the field of motor control. Background technique [0002] The main function of the switched reluctance motor power converter is to supply power to the switched reluctance motor and provide a feedback path for winding energy storage. The performance and cost of the switched reluctance motor drive system depend largely on the power converter and sensor components in addition to the motor itself. The use of power switch modules with high output and mature technology can effectively improve the integration of the drive system and reduce the system cost, volume and weight. However, in order to achieve a good control effect, the sensor is essential. For an n-phase switched reluctance motor, generally n current sensors are required; the more phases of the switched reluctance motor, the more current sensors are required. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/08H02P21/22H02P27/08
CPCH02P21/22H02P25/08H02P27/085
Inventor 宋受俊夏泽坤彭晨帆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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