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Estimation method of initial position of electrically excited synchronous motor rotor under vibration

A synchronous motor and rotor vibration technology, applied in the direction of motor generator control, electromechanical transmission control, electronic commutation motor control, etc., can solve the problem of reducing estimation accuracy, improve accuracy, reduce estimation error, and remove current noise Effect

Active Publication Date: 2018-07-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some cases, the rotor of the motor is not completely stationary, but vibrates slightly in a small range, which will cause the voltage space vector applied to the stator to not be distributed in a uniform electrical angle relative to the rotor, thereby reducing the estimation accuracy

Method used

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  • Estimation method of initial position of electrically excited synchronous motor rotor under vibration
  • Estimation method of initial position of electrically excited synchronous motor rotor under vibration
  • Estimation method of initial position of electrically excited synchronous motor rotor under vibration

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Embodiment Construction

[0028] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0029] (1) Apply an excitation voltage to the rotor of an electrically excited synchronous motor.

[0030] (2) if figure 1 As shown, a voltage space vector with a fixed amplitude is applied to the direction of phase A of the stator of the electrically excited synchronous motor, and the current acquisition value of the resolver is recorded Δ 0 .

[0031] (3) Continuously apply a voltage vector with equal magnitude around the stator 360 electrical angles starting from phase A with Δθ as the step length. like figure 2 As shown, the θ is corrected before each wave k To ensure that the voltage space vector applied on the stator is distributed in a uniform electrical angle relative to the actual position of the rotor, the correction formula is as follows: when the response current on the stator drops to zero, record the current acquisition of the resolver before t...

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Abstract

The invention relates to a method for estimating the initial position of a rotor of an electrically excited synchronous motor during vibration, and the method improves the estimation precision of the initial position of the rotor of the electrically excited synchronous motor during vibration through the compensation of a wave transmitting angle of a stator voltage space vector. The invention has the following beneficial effects that (1), the method can reduce the estimation error caused by the fluctuation of the position of the rotor during estimating the initial position of the rotor of the electrically excited synchronous motor through an inductance saturation effect; (2), the method removes the current noises through employing a Fourier decomposition signal processing method, and precisely determines the position of the rotor.

Description

technical field [0001] The invention belongs to the technical field of synchronous motor control, and in particular relates to a method for estimating the initial position of an electrically excited synchronous motor rotor under vibration. Background technique [0002] In the control technology of electrically excited synchronous motors, the initial position of the rotor is a very important quantity, and an inaccurate initial position will lead to a decrease in the load capacity of the motor and reverse rotation of the motor. Although the position sensor can detect the real-time position of the rotor, in most cases, due to the installation accuracy, there will be a certain installation error in the assembly of the position sensor and the rotor. Therefore, the initial position of the rotor must be determined by the value of the resolver and the installation error, and in some cases, due to the limitations of the installation and use of the electric excitation synchronous moto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/32H02P21/18H02P6/18
CPCH02P6/18H02P2203/03
Inventor 王锐刘卫国彭纪昌孟涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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