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Method for detecting initial position of surface mount type permanent magnet synchronous motor rotor

A permanent magnet synchronous motor and rotor initial position technology, which is applied to the control of generators, motor generators, electromechanical transmissions, etc., can solve the problems of time-consuming, voltage pulse duration, d-axis positive direction error judgment, etc., to achieve The effect of simplifying the estimation process, shortening the estimation time, and shortening the required time

Inactive Publication Date: 2014-08-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

In the process of judging the positive direction of the d-axis, voltage pulses need to be injected, and the difference in current response time is used to judge the positive direction of the d-axis. This method takes a certain amount of time in the process of judging the positive direction of the d-axis. At the same time, the amplitude of the voltage pulse and the If the duration is improperly selected, it may lead to an error in the positive direction of the d-axis

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  • Method for detecting initial position of surface mount type permanent magnet synchronous motor rotor
  • Method for detecting initial position of surface mount type permanent magnet synchronous motor rotor
  • Method for detecting initial position of surface mount type permanent magnet synchronous motor rotor

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Embodiment Construction

[0023] Such as figure 1 As shown, the present invention provides a method for detecting the initial position of the surface-mounted permanent magnet synchronous motor rotor, which specifically includes the following steps:

[0024] 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 position estimate, The initial value of is 0;

[0025] Step 2. After estimating the synchronous rotation of the rotor The d-axis of the coordinate system injects a high-frequency cosine voltage q-axis given voltage signal, Among them, U hm is the amplitude of the high-frequency voltage injected on the d-axis, t represents the current moment, ω h is the angular freque...

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Abstract

The invention discloses a method for detecting the initial position of a surface mount type permanent magnet synchronous motor rotor. On the basis that a high-frequency voltage injection method is adopted in the method to estimate the initial position for the first time, the positive direction of a shaft d is judged directly by comparing the magnitude of a positive direction peak value and the magnitude of a negative direction peak value of current response of the shaft d, signals just need to be injected once in the whole process, estimation time is shortened obviously, and the estimation process is simplified.

Description

technical field [0001] The invention belongs to the field of motor control, and more specifically relates to a method for detecting the initial position of a surface-mounted permanent magnet synchronous motor rotor. Background technique [0002] Permanent magnet motors have been widely used due to their advantages of high power factor, high power density and high efficiency. It is divided into three types: surface mount, embedded and embedded. The rotor magnet surface-mounted permanent magnet synchronous motor (SPMSM) is the easiest to manufacture and therefore the most widely used. Vector control technology can enable permanent magnet synchronous motors to achieve good operating performance. The control process requires rotor position information. Due to the problems of large volume and weight, high cost, inconvenient installation and poor precision in special occasions, the mechanical position sensor has problems. Sensorless control technology It has received extensive a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
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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