Method for measuring initial position of rotor of permanent magnetic synchronous motor

A technology of permanent magnet synchronous motor and rotor position, which is applied in the direction of measuring devices, adopting electric devices, controlling generators, etc., can solve the problems of large estimation error and estimation failure, and achieve the effect of improving accuracy and reliability

Active Publication Date: 2006-07-26
SHANGHAI SIGRINER STEP ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, when this method is applied in practice, sometimes there will be such a problem: the actual angle is θ angle, and the result obtained by the above method may be θ+180° or θ-180°, or even ot

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  • Method for measuring initial position of rotor of permanent magnetic synchronous motor
  • Method for measuring initial position of rotor of permanent magnetic synchronous motor

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0025] The present invention is realized through the following steps:

[0026] The present invention includes the step of applying a constant voltage space vector to the armature winding of the motor;

[0027] It also includes the steps of applying a voltage pulse of equal width to the armature winding to determine the initial rotor magnetic pole orientation:

[0028] When the first voltage pulse is applied, the upper bridge arm of phase A is turned on, the lower bridge arm of phase B and C is turned on, and the conduction width of the three is equal. During the conduction, the current of phase A is the target current, that is, the peak value of phase A current should be detected;

[0029] The second voltage pulse is applied, the lower bridge arm of phase A is turned on, the upper bridge arm of phase B and C is turned on, the width of the three conduc...

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Abstract

The invention relates to a method for measuring initial rotor position of permanent magnet synchronous motor which comprises steps of: applying constant voltage space vector on motor armature winding; applying constant voltage pulse for judging initial rotor magnetic pole pointing direction; applying a first voltage pulse and A phase upper bridge arm conducting, B and C phase lower bridge arm conducting and having the same conducting width with A phase. In the conducting duration, A phase current is target current for detecting A phase current peak value; and then detecting and calculating each phase target current in sequence; comparing current variance ratio on the three windings, the rotor magnetic pole axis has the shortest distance with the axis of the phase with the greatest current variance ratio, the direction and changed current direction are consistent.

Description

Technical field [0001] The invention relates to a permanent magnet synchronous motor, in particular to a method for measuring the initial rotor position of the motor. Background technique [0002] The accuracy of the initial rotor position judgment of a permanent magnet synchronous motor is directly related to whether the motor can start smoothly and whether it can be started with the maximum torque. [0003] The existing method of measuring the initial rotor position of a permanent magnet synchronous motor is to form an equivalent flux linkage circle in the air gap of the motor by applying a constant voltage space vector to the armature winding of the motor, and then detect the corresponding The armature current transforms the phase current into the current component in the dq coordinate system, and compares the d-axis current under the action of each voltage vector. The angle of the voltage vector corresponding to the maximum current is the initial position angle of the rotor. ...

Claims

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Application Information

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IPC IPC(8): G01B7/30G01D5/12H02P21/32
Inventor 马建雄韦鲲
Owner SHANGHAI SIGRINER STEP ELECTRIC
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