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Measurement method based on quadrature axis reactance measurement device of permanent-magnet synchronous motor

A permanent magnet synchronous motor and quadrature-axis reactance technology, which is used in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of cumbersome measurement process, low measurement accuracy, and manual reading, etc. Measurement accuracy, simple method, variable power factor effect

Active Publication Date: 2015-01-14
CHINA UNIV OF MINING & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods can obtain the parameter value of reactance, but the measurement process is cumbersome, manual reading is required, and the measurement accuracy is not high

Method used

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  • Measurement method based on quadrature axis reactance measurement device of permanent-magnet synchronous motor
  • Measurement method based on quadrature axis reactance measurement device of permanent-magnet synchronous motor
  • Measurement method based on quadrature axis reactance measurement device of permanent-magnet synchronous motor

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with accompanying drawing.

[0024] Such as figure 1 As shown, a permanent magnet synchronous motor quadrature-axis reactance measurement device includes a stator three-phase AC power supply 1, a three-phase power switch 2, a stator power converter 3, a current sampling circuit 6, a voltage sampling circuit 7, and an incremental speed encoder 8, permanent magnet synchronous motor 9, DSP controller 10, current sensor 4 for detecting the three-phase current value of the permanent magnet synchronous motor stator and voltage sensor 5 for detecting the stator line voltage value of the permanent magnet synchronous motor, and the stator power conversion The converter 3 is connected to the stator winding of the permanent magnet synchronous machine, one end of the stator power converter 3 is connected to the stator three-phase AC power supply 1 through the three-phase power switch 2, and the other end is electr...

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Abstract

The invention discloses a measurement method based on a quadrature axis reactance measurement device of a permanent-magnet synchronous motor, belonging to the field of a reactance measurement method of a permanent-magnet synchronous motor. The method comprises the following steps of: driving the permanent-magnet synchronous motor to rotate through a DC (direct current) motor; receiving a line number signal fed back by a rotation speed encoder by a DSP (digital signal processor), and obtaining the position angle of a motor rotor; performing 3s / 2s transformation on a stator voltage signal detected by a voltage sensor and a stator current signal detected by a current sensor to obtain the angle values of the voltage and current relative to an A-phase axis so as to calculate a power factor angle and an internal power factor angle; and substituting the obtained angles and the obtained voltage and current values into a steady-state equation of the permanent-magnet synchronous motor to calculate a parameter value of quadrature / direct axis reactance of the motor. The method has the beneficial effects that automatic measurement of the motor parameters is realized and the measurement precision is high.

Description

technical field [0001] The invention relates to a measuring method based on a permanent magnet synchronous motor quadrature axis reactance measuring device, and belongs to the field of permanent magnet synchronous motor reactance measuring methods. Background technique [0002] Permanent magnet synchronous motor has no excitation winding, simple structure, no electric excitation loss, and has the advantages of high operating efficiency, power factor and power density, and has been more and more widely used. In the research and application of permanent magnet synchronous motor, it is inevitable to know the corresponding parameters of the motor, among which the AC-direct axis inductance Ld and Lq are the most important parameters of permanent magnet synchronous motor. [0003] The current reactance measurement methods mainly include pure inductive load method, direct short circuit method, direct load method, slip method and other experimental methods. These methods can obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
Inventor 谭国俊刘向昕张辉何凤有
Owner CHINA UNIV OF MINING & TECH
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