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System and method for identifying initial angle of permanent magnet synchronous motor

A permanent magnet synchronous motor, initial angle technology, applied in control systems, control generators, vector control systems, etc., can solve the problems of obtaining the electrical angle of the motor, without the encoder, and the motor cannot start normally, to meet the starting requirements. Effect

Active Publication Date: 2013-11-20
SHENZHEN INOVANCE TECH +1
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Problems solved by technology

However, in practical applications, the encoder is often installed randomly, resulting in no initial angle information when the permanent magnet synchronous motor is powered on or the encoder does not have a Z signal (such as a linear grating scale). In this case, the correct position of the motor cannot be obtained through the encoder. electrical angle, which will cause the motor to fail to start normally

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  • System and method for identifying initial angle of permanent magnet synchronous motor

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] For the surface-mounted permanent magnet synchronous motor, it can be considered that its d-axis and q-axis inductance L d = L q , so the electromagnetic torque equation is:

[0032] T e = K t *I q (1)

[0033] where K t is the torque coefficient, I q is the Q-axis current component, if the effect of friction force is neglected, then:

[0034] T e -T L = Jα (2)

[0035] where T L is the load torque, J is the moment of inertia, and α is the angular acceleration.

[0036] Such as figure 1 As shown, when the output size to the stator is i s , the direction is θ e (e.g. θ e =...

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Abstract

The invention provides a system for identifying an initial angle of a permanent magnet synchronous motor. The running of the permanent magnet synchronous motor is controlled by a servo driver; the system comprises a current output unit, a steering determining unit, a current regulating unit and an initial angle searching unit, wherein the current regulating unit is used for regulating an angle of the output current of the current output unit according to a rotating direction of a rotor and through a way of adding a preset step-length angle on a given angle of primary current, and the initial angle searching unit is used for determining the initial angle of the rotor when the rotating direction of the rotor is changed. The invention also provides a corresponding method. According to the system and the method, which are provided by the invention, by outputting the current in the given angle to a stator of the motor and regulating the angle of the current which is output to the stator according to the rotating direction of the rotor, the position of the initial angle of the rotor of the motor can be determined.

Description

technical field [0001] The invention relates to the field of motor control, and more specifically relates to a system and method for identifying an initial angle of a permanent magnet synchronous motor. Background technique [0002] Compared with the traditional electric excitation synchronous motor, the permanent magnet synchronous motor has the advantages of less loss, high efficiency and obvious power saving effect. The permanent magnet synchronous motor provides excitation with permanent magnets, which makes the structure of the motor relatively simple, reduces the cost of processing and assembly, and saves the collector ring and brush that are prone to problems, which improves the reliability of the motor operation; and because no excitation is required Current, no excitation loss, improves the efficiency and power density of the motor, so permanent magnet synchronous motors are more and more widely used in various fields. In order to realize the vector control of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P25/02
Inventor 姚虹周兆勇肖明海徐飞鹏杜金明
Owner SHENZHEN INOVANCE TECH
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