Built-in permanent magnet synchronous motor sensor-less control method

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., and can solve problems such as difficult implementation, cumbersome calculation, and complex structure

Active Publication Date: 2013-09-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of method involves a large number of coordinate transformations and salient pole tracking algorithm links, the structure is complex, the calculation is cumbersome, and it is difficult to implement.

Method used

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  • Built-in permanent magnet synchronous motor sensor-less control method
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  • Built-in permanent magnet synchronous motor sensor-less control method

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Embodiment Construction

[0030] Below in conjunction with specific embodiments, a kind of built-in permanent magnet synchronous motor position sensorless control method proposed by the present invention is described in detail:

[0031] Such as figure 1 The structure diagram of a position sensorless control method for a built-in permanent magnet synchronous motor is shown. In the figure, αβ represents the stationary coordinate system of the stator, dq represents the rotating coordinate system of the rotor, and n * , n represent given and feedback speed signals respectively, Respectively represent the direct and quadrature axis given current signals, i d i q respectively represent the direct and quadrature axis feedback current signals, u d , u q Respectively represent the direct and quadrature axis output voltage signals, u hfα , u hfβ Denote the high-frequency voltage signals injected on the α and β axes respectively, i a i b i c Represent the three-phase winding current, I ah , I bh , I...

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Abstract

The invention discloses a built-in permanent magnet synchronous motor sensor-less control method. According to the control method, a rotary high-frequency injection method is adopted, so that phase inductances are calculated; through the symmetry and the alternating characteristic of the phase inductances, the difference of every two phase inductances is obtained, so that the differences of the phase inductances are obtained to eliminate a direct current component among the phase inductances; iterative summation calculation is carried out on the differences of the phase inductances, theoretically, a series of infinitely fractionized inductances can be obtained; simple comparison calculation is carried out on the fractionized inductances, so that the current position of a rotor is determined and obtained according to the inductance with the maximum amplitude; according to the position of the rotor, the estimated speed and a three-phase low-frequency current, a motor is driven to operate through a vector control method. Conversion of coordinates and a salient pole tracking algorithm are not needed in the estimation process of the position of the rotor, the control structure is simple and reliable, and engineering realization is easy.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a position sensorless control method of a built-in permanent magnet synchronous motor. Background technique [0002] When high-performance control strategies such as vector control are used for permanent magnet synchronous motors, real-time rotor position needs to be obtained. The rotor position is generally obtained by position sensors such as photoelectric encoders and resolvers. The use of these devices increases the complexity and cost of the motor drive system mechanism and reduces system reliability. [0003] The position sensorless control methods of permanent magnet synchronous motor mainly include high frequency injection method, back EMF method, Kalman filter method, etc. Among them, the high frequency injection method is one of the most effective methods to solve the sensorless start of permanent magnet synchronous motor. The core idea of ​​the h...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 邱鑫黄文新卜飞飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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