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Method for active short circuit control of motor

A technology of active short circuit and motor controller, applied in motor control, electronic commutation motor control, control system, etc., can solve problems such as many steps and complex technology

Inactive Publication Date: 2021-05-11
无锡华宸控制技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In summary, the existing technologies are too complicated, and there are too many steps required before a safe short circuit

Method used

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  • Method for active short circuit control of motor
  • Method for active short circuit control of motor
  • Method for active short circuit control of motor

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Embodiment Construction

[0058] The control principle adopted by the method for active short-circuit control of the motor provided by the present invention will be firstly described below.

[0059] Such as image 3 As shown, the essence of the active short circuit of the permanent magnet motor is through a switch Sw, at t 0 Always short the AC power supply E to an inductor L, where E is the back electromotive force of the motor, L is the internal winding of the motor, and Sw is the power device inside the motor controller. The change of the back electromotive force of the permanent magnet motor with time t is E(t-t 0 )=ωφcos(ω(t-t 0 )+θ E0 ), where ω is the rotational angular velocity of the motor rotor, θ E0 for t 0 Instantaneous angle of the counter electromotive force at time, φ is the flux linkage of the permanent magnet motor.

[0060] According to the circuit principle, the current expression after short circuit is:

[0061]

[0062] In formula (5) It is the expression of the steady-...

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PUM

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Abstract

The invention discloses a method for active short circuit control of a motor, which can restrain transient current when the motor is in active short circuit, and comprises the following specific steps: a, when the motor needs to enter a safe state, enabling a motor controller to record a rotor position angle theta i of the motor at the current moment, and calculate a back electromotive force line voltage; b, calculating the back electromotive force line voltage of the motor at the next moment; c, when the back electromotive force line voltage of any two phases is judged to be at a wave crest or a wave trough, carrying out two-phase short circuit firstly, wherein the remaining third phase is an open-circuit phase, and entering the step d; otherwise, returning to the step a; d, calculating the back electromotive force phase voltage of the open-circuit phase of the motor at the current moment; e, calculating the back electromotive force line voltage of the open-circuit phase of the motor at the next moment; and f, when the back electromotive force phase voltage of the open-circuit phase is judged to be at a wave crest or a wave trough, performing short circuit on the open-circuit phase; otherwise, returning to the step d. According to the method, the back electromotive force line voltage is short-circuited at the wave crest moment or the wave trough moment.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control, in particular to the motor control technology of the electric vehicle, in particular to a method for active short-circuit control of the motor. Background technique [0002] Most of the driving motors of electric vehicles (pure electric vehicles, hybrid vehicles, fuel cell vehicles, etc.) use permanent magnet synchronous motors in order to pursue higher efficiency, energy density and reliability. [0003] When the vehicle is running, if there is a serious uncontrollable fault in the vehicle system (such as battery overheating, failure of the controller's own components, etc.), the controller needs to stop the control of the permanent magnet motor immediately. If the permanent magnet motor is in a high-speed rotating state while the vehicle is running before the failure, and the high-speed permanent magnet motor loses control after stopping, the permanent magnet on the rotor will ...

Claims

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Application Information

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IPC IPC(8): H02P29/032H02P6/182
CPCH02P29/032H02P6/182
Inventor 王元宵陈守川
Owner 无锡华宸控制技术有限公司
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