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A Method for Estimating Rotor Speed ​​of Permanent Magnet Synchronous Motor

A permanent magnet synchronous motor and rotor speed technology, which is applied in the control of generators, motor generators, electronically commutated motors, etc., can solve the problems of poor robustness of non-Gaussian noise, inconvenient engineering implementation, and large amount of calculation. Achieve the effects of improving robustness, facilitating engineering realization, and reducing the amount of calculation

Inactive Publication Date: 2017-11-21
张家港智电柔性输配电技术研究所有限公司
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Problems solved by technology

However, the extended Kalman filtering method requires both the system noise and the measurement noise to be Gaussian noise, which is less robust to non-Gaussian noise
In order to improve the estimation accuracy, some scholars apply the unscented Kalman filter to the permanent magnet synchronous motor system, but this method has a large amount of calculation, is not convenient for engineering implementation, and has no obvious improvement in the robustness to non-Gaussian noise

Method used

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  • A Method for Estimating Rotor Speed ​​of Permanent Magnet Synchronous Motor
  • A Method for Estimating Rotor Speed ​​of Permanent Magnet Synchronous Motor
  • A Method for Estimating Rotor Speed ​​of Permanent Magnet Synchronous Motor

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Such as figure 1 As shown, a permanent magnet synchronous motor speed estimation method, its specific implementation steps are as follows:

[0029] The differential equation of the permanent magnet synchronous motor in the stationary coordinate system:

[0030]

[0031] After discretization, the following 4th order system equation can be obtained,

[0032]

[0033] In the formula, are the voltage and current in the stationary coordinate system, respectively, is the stator resistance, L is the stator inductance, is the permanent magnet flux linkage, are the motor rotor angular velocity and rotor position, respectively, represents the system modeling error, is a discrete time interval.

[0034] select is the measurement vector, then there is the following measurement equation

[0035] (2)

[0036] In the formula In orde...

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Abstract

The invention discloses a permanent magnetic synchronous motor rotor speed estimation method. The method includes establishing a permanent magnetic synchronous motor mathematical model, and performing vector transformation to decouple; performing order reduction on a system model, and establishing a simplifying filter model estimating the rotor speed and position only; adding stator parameters into the system model, and acquiring an augmented system model containing the generator electromechanical state and rotor parameters; finally, according to the established augmented model, acquiring an estimation value of the permanent magnetic synchronous motor rotor speed and stator parameters by the H8 filter theory. By the aid of the method, the rotor speed and stator parameters can be estimated accurately, the calculation amount is reduced, and the system robustness against parameter uncertainty is improved effectively.

Description

technical field [0001] The invention relates to the control and application of a permanent magnet synchronous motor, and specifically relates to a method for estimating the rotational speed of a permanent magnet synchronous motor. Background technique [0002] In recent years, with the rapid development of power electronics technology, microelectronics technology, new motor control theory and rare earth permanent magnet materials, permanent magnet synchronous motors have been widely used rapidly. Compared with traditional electrically excited synchronous motors, permanent magnet synchronous motors, especially rare earth permanent magnet synchronous motors, have the advantages of less loss, high efficiency and obvious power saving effect, and have been widely used in wind power generation, electric vehicles, robots and other fields . [0003] When controlling the permanent magnet synchronous motor, it is necessary to know the position and speed information of the motor rotor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/18
Inventor 沈绍博俞贵东李涛祖晖
Owner 张家港智电柔性输配电技术研究所有限公司
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