Vector type permanent magnetic brushless motor control method

A technology of permanent magnet brushless motor and control method, which is applied in vector control system, motor generator control, electronic commutation motor control and other directions, can solve the problems of motor speed-up capability limitation, torque output limitation, and inability to realize the weakening function, etc. , to achieve the effect of improving the current utilization rate, increasing the speed range, and improving the torque output capability.

Inactive Publication Date: 2016-10-26
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Using the six-step control strategy can only achieve scalar control of the motor current. If the permanent magnet brushless motor is an embedded rotor permanent magnet, its dq axis inductance is not equal, and the maximum torque output of the motor cannot be achieved using scalar control.
In addition, as the motor speed increases, the back EMF of the rotor permanent magnet gradually increases, and the scalar control based on the Hall sensor cannot realize the field weakening function, and the speed-up capability of the motor is limited
Torque output is also limited in the high rev range

Method used

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  • Vector type permanent magnetic brushless motor control method
  • Vector type permanent magnetic brushless motor control method
  • Vector type permanent magnetic brushless motor control method

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Embodiment 1

[0038] This embodiment provides a vector permanent magnet brushless motor control method, which is based on a permanent magnet brushless motor control device, and the permanent magnet brushless motor control device includes a permanent magnet brushless motor 1, a power inverter 2, Motor controller 3, motor rotor position sensor 4 and three-phase current sensor 5.

[0039] The power inverter is used to generate three-phase alternating current; the power inverter consists of power elements such as MOS tubes or IGBTs to form a special topology (three-phase full-bridge inverter) to realize the conversion of current from direct current to alternating current.

[0040] The three-phase current sensor is used to detect the three-phase current of the permanent magnet brushless motor; it is generally a Hall current sensor.

[0041] The motor rotor position sensor is used to detect the actual position of the motor rotor; it is composed of high-precision position sensors such as resolvers...

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Abstract

The invention discloses a vector type permanent magnetic brushless motor control method. When a motor starts, by use of a constant-torque zone current closed-loop control method, a permanent magnetic brushless motor is controlled, when a PWM duty ratio output by an electric current loop proportional integral controller reaches a set threshold, by use of a constant-power weak-magnetic zone torque closed-loop control method, the permanent magnetic brushless motor is controlled; and in the constant-power weak-magnetic zone torque closed-loop control method, when a weak-magnetic control advanced conduction overlap angle delta theta FW output by a torque ring proportional integral controller is lower than a set threshold, by use of a constant-torque zone current closed-loop control method, the permanent magnetic brushless motor is controlled.

Description

technical field [0001] The invention relates to a motor control method, in particular to a vector permanent magnet brushless motor control method. Background technique [0002] Pure electric vehicles and hybrid vehicles will become the main forms of future vehicles due to their low pollution and emissions and high fuel economy. The power of pure electric vehicles and hybrid vehicles mainly uses permanent magnet synchronous motors and permanent magnet brushless motors. The permanent magnet brushless motors are permanent magnet synchronous motors with trapezoidal wave back EMF, also known as DC brushless motors. [0003] At present, the use of permanent magnet brushless motors as automotive power motors uses a six-step control strategy based on Hall sensors. Using the six-step control strategy can only achieve scalar control of the motor current. If the permanent magnet brushless motor is an embedded rotor permanent magnet, its dq axis inductance is not equal, and the maximum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/20H02P6/16
CPCH02P6/16
Inventor 李岩常城赵慧超
Owner CHINA FIRST AUTOMOBILE
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