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Torque calculation method and device of permanent-magnet synchronous motor

A technology of permanent magnet synchronous motor and calculation method, which is applied to control electromechanical transmission, control generator, motor generator control, etc., can solve the problems of difficult system stability and low torque value accuracy, and achieve safety and reliability. High performance, good torque monitoring, and the effect of avoiding torque estimation errors

Active Publication Date: 2017-05-24
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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Problems solved by technology

However, due to the accumulation of errors caused by integration, the system constructed by this method is difficult to be stable, so the accuracy of torque value calculation using this method is also low

Method used

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  • Torque calculation method and device of permanent-magnet synchronous motor
  • Torque calculation method and device of permanent-magnet synchronous motor
  • Torque calculation method and device of permanent-magnet synchronous motor

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no. 2 example

[0046] Please refer to image 3 and Figure 4 , image 3 It is a main structural block diagram of the permanent magnet synchronous motor torque calculation device provided by the second embodiment of the present invention. Figure 4 for image 3 The structural block diagram of the flux calculation module in the torque calculation device. The permanent magnet synchronous motor torque calculation device includes: a voltage and current calculation module 301 , a flux linkage calculation module 303 , and a motor torque calculation module 305 .

[0047] Specifically, the voltage and current calculation module 301 is used to calculate the voltage in the two-phase static coordinate system of the motor according to the duty ratio of the switch tube of the motor controller, the bus voltage, and the three-phase current of the motor, and calculate the three-phase current of the motor The coordinate transformation obtains the current in the two-phase stationary coordinate system;

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Abstract

The embodiment of the invention, which belongs to the technical field of the motor, discloses a torque calculation method and device of a permanent-magnet synchronous motor. The calculation method comprises: according to a duty ratio of a motor controller switching tube, a bus voltage and a motor three-phase current, the voltage of the motor in a two-phase stationary coordinate system is calculated, and coordinate transformation is carried out on the three-phase current of the motor to obtain the current in the two-phase stationary coordinate system; according to the voltage and current in the two-phase stationary coordinate system, the flux linkage and the current in a rotor coordinate system are obtained based on a flux MRAS method; and the torque of the motor is calculated according to the flux linkage and current in the rotor coordinate system. With the torque calculation method and device, the torque of the permanent-magnet synchronous motor can be calculated accurately.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method and device for calculating the torque of a permanent magnet synchronous motor. Background technique [0002] The development of permanent magnet synchronous motors benefits from the development of power electronics technology and modern control theory. Permanent magnet synchronous motors use permanent magnets to generate air gap flux without external excitation, and have extremely high power density and torque / inertia ratio. And it also has the advantages of small size, light weight, high energy conversion efficiency, high operating reliability, wide speed range, etc., and is increasingly being used more and more widely. Especially in the fields of robots, aerospace, radar antennas, precision electronic equipment, film slitters, CNC machine tools, winding machinery, electric vehicles, elevators, ships and submarines, etc. For example, in the field of electric vehicles, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 黄慈梅刘伟李乐荣夏铸亮廖展图肖莎
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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