Method and device for detecting initial position of rotor of permanent magnet synchronous motor and frequency converter

A technology of rotor initial position and permanent magnet synchronous motor, which is applied in the direction of electronic commutator, motor control, electrical components, etc., and can solve problems such as difficulty in obtaining expected effects and small size

Inactive Publication Date: 2020-02-28
青岛斑科变频技术有限公司
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  • Abstract
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Problems solved by technology

However, this method can only obtain detection results that are bound to the direction of the voltage vector, and the strategy of increasing the detection accuracy by increasing the synthetic voltage vector is difficult because the difference between the target observations corresponding to adjacent voltage vectors gradually becomes smaller. get the desired effect

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  • Method and device for detecting initial position of rotor of permanent magnet synchronous motor and frequency converter
  • Method and device for detecting initial position of rotor of permanent magnet synchronous motor and frequency converter
  • Method and device for detecting initial position of rotor of permanent magnet synchronous motor and frequency converter

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Embodiment Construction

[0030]The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0031] Among them, in the description of the embodiments of this application, unless otherwise specified, " / " means or means, for example, A / B can mean A or B; "and / or" in this article is only a description of associated objects The association relationship of indicates that there may be three kinds of relationships, for example, A and / or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. In addition, in the description of the embod...

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Abstract

The invention discloses a permanent magnet synchronous motor rotor initial position detection method and device, a frequency converter and a storage medium, and relates to the technical field of rotorinitial position detection. The method comprises the steps: respectively blocking the output of any one phase in three phases, and enabling the other two phases to selectively pressurize three-phasewindings; after the pressurization is finished, respectively carrying out current sampling to obtain a first sampling current, a second sampling current and a third sampling current; and determining the axial position of the rotor magnetic pole according to the first sampling current, the second sampling current and the third sampling current based on a magnetic pole axial angle calculation formula. According to the permanent magnet synchronous motor rotor initial position detection method, the permanent magnet synchronous motor rotor initial position detection device and the frequency converter, modulation of a plurality of voltage vectors is not needed, so that the detection process is greatly simplified, and the influence of control errors is thoroughly eliminated.

Description

technical field [0001] The invention relates to the technical field of rotor initial position detection, in particular to a method, device and frequency converter for detecting the initial position of a permanent magnet synchronous motor rotor. Background technique [0002] In order to ensure the permanent magnet synchronous motor (permanent magnet synchronous motor: PMSM) speed sensorless control system has high torque and no backswing starting characteristics, its frequency conversion controller should have the function of detecting the initial position of the rotor. [0003] The detection and estimation of the initial position of the rotor must ensure that the rotor position does not change during the whole process, and at the same time meet the requirements of accuracy and speed. [0004] In the prior art, there is a vector injection two-step detection method that is easy to implement by a frequency converter. Step 1: Apply 12 equally spaced small-amplitude voltage vect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/16
CPCH02P6/16H02P2207/05
Inventor 李光明徐政王秀波徐向宇关彦彬
Owner 青岛斑科变频技术有限公司
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