Method for detecting initial position of rotor of three-stage synchronous motor

A technology for initial rotor position and synchronous motors, applied in the control of generators, electronic commutators, motor generators, etc., can solve problems such as complex implementation, achieve short detection time, simple signal injection and signal extraction methods, and easy detection high precision effect

Inactive Publication Date: 2018-05-15
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The rotor initial position detection method based on the voltage vector pulse injection method based on the inductance saturation effect In practical applications, the detection accuracy of ...

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  • Method for detecting initial position of rotor of three-stage synchronous motor
  • Method for detecting initial position of rotor of three-stage synchronous motor
  • Method for detecting initial position of rotor of three-stage synchronous motor

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Embodiment Construction

[0022] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0023] Step 1: The structure of a three-stage synchronous motor using two-phase AC excitation is as follows figure 1 shown. Firstly, the rotor of the main motor of the three-stage synchronous motor is excited. The two-phase AC excitation voltage with the same amplitude (210Vrms), the same frequency (200Hz), and a phase difference of 90° is passed to the two-phase stator windings of the main exciter. Since the electrical angle of the two-phase stator windings is also 90° in space, a rotating magnetic field will be generated in the main exciter, and the rotating magnetic field will generate a three-phase induced voltage in the three-phase winding of the rotor, and the three-phase voltage will pass through the rotating rectifier After rectification, the pulsating direct current is output to realize the excitation of the rotor of the main motor.

[0024] Step 2: I...

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Abstract

The invention relates to a method for detecting an initial position of a rotor of a three-stage synchronous motor. The method comprises the following steps: injecting a rotary high-frequency voltage signal into a main motor stator side, detecting a high-frequency current response signal on a main exciter stator side, and performing filtering, Park transformation, arc tangent and other processing on a current signal, thereby obtaining the initial position of the rotor. Experimental results show that the method has the advantages that the initial position of the rotor can be rapidly and accurately detected, the rotor does not rotate, parameters of the motor do not need to be known, the hardware structure is simple, and the detection accuracy of the initial position of the rotor can meet thestationary start requirements of the three-stage synchronous motor.

Description

technical field [0001] The invention belongs to the technical field of electric excitation synchronous motor control, and relates to a three-stage synchronous motor rotor initial position detection method. Background technique [0002] Starting / generating integration is an important development trend of future aviation power system. The three-stage synchronous motor has many advantages such as high power density, high reliability, and simple maintenance, and is currently widely used in aviation high-power AC power systems. If the electric state of the generator can be used to start the aeroengine, the special starter can be omitted and the onboard weight can be reduced, which is of great significance for the development of multi- / all-electric aircraft. Being able to accurately detect the initial position of the rotor is the premise of realizing the high-performance closed-loop starting control of the three-stage synchronous motor. Inaccurate initial rotor position will affe...

Claims

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Application Information

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IPC IPC(8): H02P6/16H02P21/32
CPCH02P6/16H02P21/32
Inventor 祝宇杰刘卫国彭纪昌孟涛焦宁飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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