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A motor system with the ability to reduce common-mode interference

A common mode interference and capability technology, applied in the control system, AC motor control, electrical components and other directions, can solve the problem of common mode interference in the motor system, and achieve the effect of improving electromagnetic compatibility, reducing changes, and reducing common mode interference.

Active Publication Date: 2016-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This alternating common-mode voltage causes common-mode disturbances in the motor system

Method used

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  • A motor system with the ability to reduce common-mode interference
  • A motor system with the ability to reduce common-mode interference
  • A motor system with the ability to reduce common-mode interference

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The circuit topology of this embodiment is as figure 2 As shown, taking the three-phase as an example, a switching tube is connected in series on the positive and negative terminals of the DC voltage (the chopper switch connected to the positive pole is S7, and the chopper switch connected to the negative pole is S8); the chopper switches S7 and S8 are followed by Into a full-bridge inverter circuit composed of 6 switching tubes, in which S1 and S4 form the upper and lower arms of the first bridge arm, S3 and S6 form the upper and lower arms of the second bridge arm, and S5 and S2 form the upper and lower arms of the third bridge arm arm.

[0042] When the zero-voltage space vector acts, the common-mode voltage of the motor is . If the DC power supply and the inverter are disconnected at the same time under the action of the zero-voltage space vector, the motor power supply will be in a high-impedance state at this time, and the potential of the motor is completely dete...

Embodiment 2

[0050] In this embodiment, only the chopper switch S7 at the high voltage is selected for control, and the other chopper switch is always on. In addition, in order to reduce costs and simplify control, this chopper switch can be omitted, and the negative pole of the DC power supply and the inverter The negative terminal is directly connected.

[0051] Taking the three-phase as an example, a switch tube is connected in series with the positive terminal of the DC voltage (the chopper switch is S7); behind the chopper switch S7, a full-bridge inverter circuit composed of six switch tubes is connected, among which, S1 and S4 are composed of The upper and lower arms of the first bridge arm, S3 and S6 form the upper and lower arms of the second bridge arm, and S5 and S2 form the upper and lower arms of the third bridge arm.

[0052] When the zero-voltage space vector V7 acts, the common-mode voltage of the motor is . If the connection with the DC power supply is disconnected at the...

Embodiment 3

[0059] In this embodiment, only the chopper switch S8 at the low voltage is selected for control, and the other chopper switch is always on. In addition, in order to reduce costs and simplify control, this chopper switch can be omitted, and the positive pole of the DC power supply and the inverter The positive ends are directly connected.

[0060] Also taking the three-phase as an example, a switch tube is connected in series on the negative terminal of the DC voltage (the chopper switch is S8); the chopper switch S8 is connected to a full-bridge inverter circuit composed of 6 switch tubes, among which, S1 and S4 are composed of The upper and lower arms of the first bridge arm, S3 and S6 form the upper and lower arms of the second bridge arm, and S5 and S2 form the upper and lower arms of the third bridge arm.

[0061] When the zero-voltage space vector V0 acts, the common-mode voltage of the motor is . If the connection with the DC power supply is disconnected at the same ti...

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Abstract

The invention discloses a motor system capable of reducing common-mode interference, which includes a motor, a DC power supply, a bridge inverter, a controller and 1 to 2 chopper switches; the invention controls two chopper switches at the same time, and can Reduce the maximum and minimum values ​​of the common-mode voltage of the motor, minimize the change of the common-mode voltage, and improve the electromagnetic compatibility of the system; when only choosing to control any chopper switch tube, it can also reduce the variation of the common-mode voltage of the motor The maximum or minimum value, so that the cost can be reduced under the premise of reducing the common mode interference of the motor. The control strategy of the present invention can be realized only by simple modification on the commonly used motor drive system, which is conducive to the rapid application of the motor system, quickly solves the existing common mode interference problem, and improves the electromagnetic compatibility of the system. Therefore, the realization method Simple and practical.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a motor system capable of reducing common-mode interference. Background technique [0002] At present, the known motor controller is used to flexibly control the running state of the motor. It is generally composed of two parts: rectification and inverter. Stable operation within the speed range. The pulse width modulation technology acts on the inverter part, and realizes the flexible control of the motor by switching on and off the DC voltage. Due to the superiority of pulse width modulation technology in motor control, it has gradually replaced the application of speed regulation methods such as voltage regulation and pole changing in the field of motor control in recent years. [0003] Although the existing pulse width modulation technology has excellent control performance, its high-frequency switching characteristics will cause high-frequency common-mode interf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/12
Inventor 沈建新王宇翔孙伟金孟加
Owner ZHEJIANG UNIV
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