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Position sensor-free control apparatus and position detection method

A control device and sensor technology, applied in the direction of controlling electromechanical transmission device, control system, control generator, etc., can solve problems such as large motor current fluctuation

Active Publication Date: 2013-10-09
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Embodiments of the present invention provide a position sensorless control device and a position detection method, which are used to solve the technical problem of large current fluctuations of the motor caused by detecting the rotor position in the prior art

Method used

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  • Position sensor-free control apparatus and position detection method

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Embodiment Construction

[0075] Embodiments of the present invention provide a position sensorless control device and a position detection method, which are used to solve the technical problem in the prior art that the motor current fluctuates greatly when detecting the rotor position.

[0076] The technical solution in the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows:

[0077] A position sensorless control device applied to a permanent magnet motor is provided, the position sensorless control device includes: a current determination unit, which is used to determine the q-axis current value I of the permanent magnet motor T1 moment q ; Axis error detection unit, connected to the current determination unit, for receiving the q-axis current value I q and, based at least on the q-axis current value I q , the induction voltage constant setting value K of the permanent magnet motor e * and the q-axis inductance value L of the...

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Abstract

The invention discloses a position sensor-free control apparatus and a position detection method. The apparatus that is applied to a permanent magnet motor comprises: a current determination unit, which is used for determining a q-shaft current value I q of the permanent magnet motor at T1 time; a shaft error detection unit, which is connected with the current determination unit and is used for receiving the q-shaft current value I q and determining a shaft error delta theta of the permanent magnet motor at the T1 time at least based on the q-shaft current value I q, an induced voltage constant setting value Ke* of the permanent magnet motor and a q-shaft inductance value L q* of the permanent magnet motor; and a position detection unit, which is connected with the shaft error detection unit and is used for determining a position theta c of a rotor of the permanent magnet motor at the T1 time based on the shaft error delta theta.

Description

technical field [0001] The invention relates to the field of permanent magnet motors, in particular to a position sensorless control device and a position detection method. Background technique [0002] The permanent magnet brushless DC motor is a DC motor with a magnetic field established by one or more permanent magnets. Its performance is similar to that of a separately excited DC motor with constant excitation current, and the speed can be easily adjusted by changing the armature voltage. Compared with the separately excited DC motor, it has the advantages of small size, high efficiency, simple structure, and less copper consumption. [0003] In the permanent magnet brushless DC motor, one of the key technologies is to detect the position of the rotor. In the prior art, various methods can be used to detect the position of the device, such as determining the axis error Δθ by the following formula, and then determining the position of the rotor through the axis error Δθ:...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P25/02
Inventor 钟明陈跃涂小平刘启武
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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