Detection method for initial position of rotor in static state of permanent magnet synchronous motor (PMSM)

A permanent magnet synchronous motor and initial position detection technology, which is applied in the control of generators, motor control, electronic commutators, etc., can solve the problems of long algorithm detection time, complex algorithm reliability, etc., and achieves easy implementation and wide application range , to achieve the effect of simple algorithm

Inactive Publication Date: 2018-07-24
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

[0007] The invention provides a method for detecting the initial position of the permanent magnet synchronous motor rotor in a static state, which is used to solve the problems of long algorithm detection time, complex algorithm and low reliability in the existing detection means

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  • Detection method for initial position of rotor in static state of permanent magnet synchronous motor (PMSM)
  • Detection method for initial position of rotor in static state of permanent magnet synchronous motor (PMSM)
  • Detection method for initial position of rotor in static state of permanent magnet synchronous motor (PMSM)

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Embodiment Construction

[0026] Embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0027] A method for detecting the initial position of a permanent magnet synchronous motor rotor in a stationary state according to an embodiment of the present invention includes the following steps:

[0028] right figure 2 In the hardware structure of the permanent magnet synchronous motor control system, the power tube applies the control signal.

[0029] Step 1: Adjust the voltage vector injection time to make the injected current large enough to improve the discrimination of magnetic flux saturation. Inject V1 (100) and V4 (011) multiple times into the static permanent magnet synchronous motor respectively, and adjust the voltage vector pulse application time until the A-phase response current is a certain multiple of the rated current. Phase A current waveform as Figure 5 , where 1, 2, 3, and 4 are the current injected into phase A when l...

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Abstract

The invention provides a detection method for an initial position of a rotor in a static state of a PMSM. A voltage vector is injected along the direction of a random phase of stator, and proper voltage pulse injection time is determined; a pair of basic space voltage vectors in positive and negative directions is injected to the PMSM in the static state along the direction of each of three phasesof stators, and a three-phase current value of the PMSM is detected and recorded the moment that a pulse effect of each basic space voltage vector ends; and current values, obtained by sampling, of each phase are accumulated algebraically, and an angle of the initial position of the rotor of the PMSM is calculated according to a formula. The method does not needs a lot of data operation, a realization algorithm is simple, steps are simple, realization is easy, and the engineering practicality is higher; the method is not limited by the saliency of the rotor, and can be widely applied to surface-mounted and embedded PMSMs.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a method for detecting the initial position of a rotor in a stationary state of a permanent magnet synchronous motor. Background technique [0002] In order to realize the high-precision and high-efficiency control of the permanent magnet synchronous motor, it is necessary to obtain the precise initial position of the rotor, otherwise the system may not be able to work in a high-performance state, and even lead to startup failure. [0003] In the early days, absolute position encoders were often used to detect the rotor position, but the encoder itself has mechanical errors, which reduces the reliability of the speed control system, and at the same time makes the system more complicated and costs more. [0004] At present, domestic and foreign scholars have proposed a lot of PMSM initial position detection methods, which are summarized as high-frequency signal i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18H02P21/18
CPCH02P6/18H02P21/18H02P2203/03H02P2203/09
Inventor 王宾彭皆彩
Owner ANHUI UNIV OF SCI & TECH
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