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Permanent Magnet Synchronous Motor Servo System and Positioning and Deviation Elimination Method

A permanent magnet synchronous motor and servo system technology, applied in the direction of electrical components, electromechanical devices, electric components, etc., can solve the problems of large rotor rotation range, small motor electromagnetic torque, mechanical impact, etc. The method is simple and fast, and the rotor rotation The effect of small movements and high positioning accuracy

Active Publication Date: 2018-05-08
SHANGHAI SEEYAO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method takes a long time to calibrate, and during the whole calibration process, the rotor rotates in a large range, causing mechanical shock, and due to the friction of the permanent magnet synchronous motor rotor itself, and when this method is used for zero calibration, the The electromagnetic torque of the motor will be very small when it is close to the design zero position, so there will be a large error in this method

Method used

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  • Permanent Magnet Synchronous Motor Servo System and Positioning and Deviation Elimination Method

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Embodiment 1

[0064] The servo system of the permanent magnet synchronous motor of the present invention is based on a hybrid incremental encoder. When the code disc of the hybrid incremental encoder rotates, a code disc pulse signal and a Hall signal are generated. Refer to figure 1 , the servo system of the present invention comprises:

[0065] The initial search judgment unit judges the initial search angle and direction according to the Hall signal; the motor running direction judgment unit judges the motor rotation direction according to the code disc pulse signal; the variable step search calculation unit is connected with the initial search judgment unit and the motor running direction judgment The unit is connected to search out the rotor initial position angle of the permanent magnet synchronous motor according to the initial search angle and direction and the motor rotation direction, so as to locate the permanent magnet synchronous motor; Hall event and rotor position angle mappin...

Embodiment 2

[0068] refer to Figure 2 to Figure 9 , the specific embodiment of the positioning and deviation elimination method of the permanent magnet synchronous motor of the present invention is:

[0069] This embodiment adopts the built-in permanent magnet synchronous motor (IPMSM), utilizes the current-speed-position three-loop system control, preferably adopts the current closed-loop control structure in the process of positioning the initial position of the rotor, that is, closes the position loop of the three-loop system and speed loop, only the current loop is reserved, the specific control structure block diagram is as follows figure 2 shown. figure 2 i in d Incrementing the given table is image 3 The excitation current shown (i d ) pulse given mode, i d * is a current given excitation current, i q * is a current given torque current; the d-axis current regulator and the q-axis current regulator are respectively the excitation current i d where the d-axis and the tor...

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Abstract

The invention relates to the technical field of motors, in particular to a mixed incremental encoder-based servo system for a permanent magnet synchronous motor and positioning and deviation eliminating methods. The servo system mainly comprises an initial search judgment unit, a motor operation direction judgment unit, a variable step search calculation unit, a hall event and rotor position angle mapping unit, an error correcting unit and a current setting calculation unit. Through the positioning and deviation eliminating methods, the initial position angle of the permanent magnet synchronous motor when started can be quickly and accurately determined; the target that the rotor position is smoothly corrected once when a servo motor rotates for a 60-degree electrical angle can be achieved in the operation process of the motor; and the positional accuracy is greatly improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a permanent magnet synchronous motor servo system based on a hybrid incremental encoder and a positioning and deviation elimination method. Background technique [0002] Accurate rotor position is the prerequisite for high-performance vector control of permanent magnet synchronous motors. At present, most permanent magnet synchronous motor servos use mechanical sensors to obtain the position information of the motor rotor. Among them, photoelectric encoders are the most used. Different counting methods can be divided into absolute, incremental and hybrid. The hybrid incremental encoder has a simple structure, fast response, small size, and can detect the initial position of the motor. It is the most widely used; and the absolute photoelectric pulse encoder The encoder is expensive, and the resolution is far inferior to the incremental photoelectric pulse encoder. [0003] Althoug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K29/08H02K11/215
CPCH02K29/08
Inventor 夏银龙李勇
Owner SHANGHAI SEEYAO ELECTRONICS CO LTD
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