A torque control method for permanent magnet synchronous motor

A permanent magnet synchronous motor and torque control technology, which is applied in motor control, motor generator control, electronic commutation motor control, etc., can solve problems such as inapplicability of weak magnetic ring, divergence, system oscillation, etc., and achieve improved stability , optimize the control method, and reduce the effect of overcurrent risk

Active Publication Date: 2020-10-02
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Application Information

AI Technical Summary

Problems solved by technology

Among them, there is a serious coupling between the weak magnetic ring and the current ring. If the PI parameters are not adjusted properly, it is easy to cause system oscillation or even divergence during the dynamic response process, resulting in motor overcurrent failure.
Therefore, in some occasions that require high stability, weak magnetic rings are not suitable

Method used

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  • A torque control method for permanent magnet synchronous motor
  • A torque control method for permanent magnet synchronous motor
  • A torque control method for permanent magnet synchronous motor

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] The field weakening control of the permanent magnet synchronous motor is a technical difficulty in this field. When the permanent magnet synchronous motor works in the constant power area, it needs to enter the field weakening operation state. The traditional control method is to superimpose a field weakening on the original control loop PI regulators such as figure 1 As shown, um_max is the set field weakening point. Calculate the output voltage amplitude through the d and q axis output voltage and compare it with um_max to calculate the difference. Use this difference to perform PI adjustment, and the output is the field weakening adjustment amount i_delta and superimpose it on the d-axis current setpoint. Obviously, there is a strong coupling relationship between the field-weakening PI regulator and the original d-axis current loop. During the rapi...

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Abstract

The invention discloses a torque control method of a permanent-magnet synchronous motor. Permanent-magnet synchronization is divided into two running states, one of the running states is a running state which weak flux is not entered, and conventional dual-current ring control is employed under the state, the other running state is a running state which weak flux is entered, a control algorithm isswitched to amplitude phase control from dual current rings, the two control modes are switched according to the running state of the motor, a switching point of the two control methods is a weak flux point of the motor, a modulation coefficient of an output voltage is calculated according to a bus voltage, and whether the motor in a weak flux running state or not according to a set threshold. Byemploying the method, PI link of weak flux is not needed to be added within the full-speed range of the permanent-magnet synchronous motor, an overcurrent risk in the control of the permanent-magnetsynchronous motor is reduced, and the stability of the system is greatly improved.

Description

technical field [0001] The invention belongs to the field of permanent magnet synchronous motor control, and in particular relates to a permanent magnet synchronous motor control method, which is mainly suitable for occasions requiring high operating stability of the permanent magnet synchronous motor. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM for short) is a new type of synchronous motor composed of rare earth permanent magnets instead of field windings. It has the advantages of simple structure, small size, light weight, high efficiency, high power factor, no heating problem of the rotor, large overload capacity, small moment of inertia and small torque ripple. PMSM does not require current excitation, does not have brushes and slip rings, so it is easy to use and has high reliability. Therefore, the system composed of PMSM has been widely used in flexible manufacturing systems, robots, office automation and numerical control machine tools and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/05
CPCH02P21/05H02P2207/05
Inventor 李鹏徐鸿槐博超肖烨然孙宇飞
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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