Method for detecting initial position of sensorless permanent magnet synchronous motor

A permanent magnet synchronous motor, initial position detection technology, applied in the control of generator, motor generator control, electronic commutation motor control and other directions, can solve the problems of difficult identification signal detection, motor rotation defects, etc., to avoid motor rotation, Easy to achieve and accurate results

Inactive Publication Date: 2014-11-19
中山市蒙力电机电器有限公司
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Problems solved by technology

[0004] The present invention aims to propose a method for detecting the initial position of a permanent magnet synchronous motor without a position sensor, especially a method for...

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  • Method for detecting initial position of sensorless permanent magnet synchronous motor
  • Method for detecting initial position of sensorless permanent magnet synchronous motor
  • Method for detecting initial position of sensorless permanent magnet synchronous motor

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specific Embodiment approach

[0017] Combine below Figure 1 to Figure 3 Describe the specific embodiment of the present invention, this embodiment comprises the following steps:

[0018] Step 1: If figure 1 As shown in the physical model diagram of the permanent magnet synchronous motor in the synchronous rotating coordinate system, the actual angle is defined as θ, and the estimated angle is And lagging behind θ, the estimated angle error is Δθ, the actual direct axis is the d axis, the actual quadrature axis is the q axis, and the estimated direct axis is axis, the estimated intersection axis is axis, the actual synchronous rotating coordinate system is d-q, and the estimated synchronous rotating coordinate system is Then, under the condition that the motor is in a static state, open-loop control is performed on the current to initialize the initial position of the rotor, that is, an initial position of the rotor is arbitrarily assumed first.

[0019] Step 2: If image 3 Shown in the flow chart...

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Abstract

The invention relates to a method for detecting the initial position of a sensorless permanent magnet synchronous motor. On the basis of ensuring the static state of the motor, open-loop control is carried out on current, the initial position of a rotor is initialized, estimated high-frequency alternating axial current is extracted by injecting high-frequency cosine voltage signals into an estimation direct axis of an estimated synchronous rotating coordinate system, and signal processing and adjusting are carried on the high-frequency alternating axial current to obtain the estimated initial value of the initial position of the rotor; then a plurality of high-frequency cosine voltage signals of the determined period are continuously injected into the estimation direct axis, and the magnetic polarity is judged and the accurate initial position of the rotor is obtained by judging whether an integral value of the direct axis current is positive or negative. Motor parameters do not need to be obtained, the problem that as an existing rotor initial position detecting method possibly causes motor rotation, identification signals are difficult to detect is effectively avoided, hardware does not need to be additionally arranged, implementation is convenient, and the initial position of any rotor magnetic pole can be accurately obtained when the motor is in the static state.

Description

technical field [0001] The invention relates to a method for judging the initial polarity of a motor rotor, and belongs to the field of motor control, in particular to a method for detecting the initial position of a permanent magnet synchronous motor without a position sensor. Background technique [0002] Permanent magnet synchronous motors have been widely used in the field of AC drives due to their excellent running performance. However, the control of the permanent magnet synchronous motor needs to know the accurate rotor position and speed. The mechanical sensors installed for this purpose, such as photoelectric encoders and resolvers, not only increase the size and cost of the system, but also reduce the reliability of the system. , which limits the applications of permanent magnet synchronous motors. Therefore, many experts and scholars have devoted themselves to the research of position sensorless in recent years. Among them, the initial position detection of the ...

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Application Information

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IPC IPC(8): H02P21/14
Inventor 石成富王刚
Owner 中山市蒙力电机电器有限公司
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