Method of detecting initial position of surface-mounted permanent magnet synchronous motor rotor

A technology of rotor initial position and permanent magnet synchronous motor, which is applied to the control of generators, motor generators, AC motors, etc., to shorten the estimation time, avoid the vibration of small inertia motors, and simplify the estimation process

Inactive Publication Date: 2014-09-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The process of judging the positive direction of the magnetic pole needs to inject positive and negative voltage pulses and then compare the time it takes for the current response to decay to 0. This process will inevitably take a certain amount of time.

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  • Method of detecting initial position of surface-mounted permanent magnet synchronous motor rotor
  • Method of detecting initial position of surface-mounted permanent magnet synchronous motor rotor
  • Method of detecting initial position of surface-mounted permanent magnet synchronous motor rotor

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Embodiment Construction

[0023] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, the present invention provides a method for detecting the initial position of the rotor of a surface-mounted permanent magnet synchronous motor, which specifically includes the following steps:

[0025] Step 1. Establish a coordinate system relationship diagram, such as figure 2 As shown, d-q is the actual synchronous rotating coordinate system, In order to estimate the rotor synchronous rotating coordinate system, α-β is the actual two-phase stationary coordinate system, and define the estimated position error Among them, θ is the actual rotor initial position, is the final initial position estimate, The initial value of is 0;

[0026] Step 2. After estimating the synchronous rotation of the rotor The d-axis of the coordinate system injects a high-frequency cosine voltage U hm cos(ω h t), q-a...

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Abstract

The invention discloses a method of detecting the initial position of a surface-mounted permanent magnet synchronous motor rotor. On the basis of realizing primary initial position estimation by using a high-frequency voltage injection method, and d-axis positive direction judgment is then carried out through extracting d-axis positive direction information in a direct current component responsive to d-axis current. Extra positive and negative pulse injection and current response amplitude comparison are not needed, the evaluation time is shortened, the evaluation process is simplified, tender moving of the rotor does not happen, and applications are broadened.

Description

technical field [0001] The invention relates to a method for detecting the initial position of a rotor of a surface-mounted permanent magnet synchronous motor, which belongs to the field of motor control. Background technique [0002] At present, the method for detecting the initial position of the surface-mounted permanent magnet synchronous motor rotor is mainly based on the pulse vibration high-frequency signal injection method. [0003] Liu Ying, Zhou Bo, Li Shuai, et al. Rotor initial position detection of surface-mounted permanent magnet synchronous motor with rotor magnet[J]. Proceedings of the Chinese Society for Electrical Engineering, 2011, 31(18): 48-54. Based on the SPMSM stator core Linear saturation characteristics, first inject a high-frequency sinusoidal voltage signal into the d-axis of the estimated rotor synchronous rotation coordinate system, obtain the initial estimated value of the rotor position through closed-loop adjustment, and then inject positive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P25/02
Inventor 刘兵周波刘海东李洁王龙王庆龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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