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Method for field-oriented regulation of frequency converters for three-phase AC motors

A field-oriented, three-phase AC technology, applied in the direction of motor generator control, electromechanical brake control, electronic commutation motor control, etc., can solve problems such as unsatisfactory and inaccurate

Active Publication Date: 2019-01-22
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this leads to unsatisfactory imprecision

Method used

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  • Method for field-oriented regulation of frequency converters for three-phase AC motors
  • Method for field-oriented regulation of frequency converters for three-phase AC motors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] exist figure 1 , a synchronous three-phase AC motor with a permanent magnet rotor PMSM is driven in a known manner by means of three pulse-modulated voltages UR, US, UT. The pulse-modulated voltages UR, US, UT are generated by a modulation unit 6, which performs vector modulation, for example.

[0019] The currents IR, IS, IT flowing through the stator coils of the three-phase AC motor due to the pulse-modulated voltages UR, US, UT are detected, for example by means of shunt resistors, and supplied to the conversion unit 7, which calculates therefrom Current vectors (Stromzeiger) Ialpha, Ibeta representing the field position in the electric motor in the stator-fixed complex coordinate system.

[0020] In the conversion unit 8 , the current vectors Ialpha, Ibeta of the stator-fixed coordinate system are converted into current vectors ID, IQ of the rotor-fixed coordinate system. For this, a rotor position angle (Rotorlagewinkel) Theta is required, which is obtained in t...

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Abstract

Method of field-oriented regulation of a frequency converter for a three-phase AC motor, in which the new position of the rotating field in the motor is adjusted by means of voltage pulses of the stator coil, the rotating field being predetermined by the duration of the voltage pulse and its time offset The amplitude and angle of the vector, the duration and the offset are the result of calculation of the adjustment parameters in the digital control object in the rotor-fixed coordinate system, which are converted into adjustment variables in the stator-fixed coordinate system by inverse transformation , the time point of the voltage pulse edge is obtained from the adjustment parameters in the fixed coordinate system of the stator. The calculation of the adjustment variable in the fixed coordinate system of the stator by the second edge of the voltage pulse is broken down into two sub-calculations with the angle of rotation of the first edge and with the angle of rotation from the first to the second edge, adjustment of the first edge A first partial calculation of the parameters is also used for the second edge, and a second partial calculation of the adjustment parameters is used for a predefined number of coordinate rotations.

Description

technical field [0001] Frequency converters for three-phase AC motors are currently almost exclusively operated with microcontrollers which undertake the entire task of regulating and generating the actuation signals for the stator coils of the electric motor. In this case, the actuation signal is pulse-width modulated (PWM) in order to be able to adjust the desired position of the rotary field over the pulse duration of the signal. The method should also be used in the case of electric motors with high rotational speeds and in the case of high actuation frequencies. With regard to the desired sinusoidal shape of the motor control signal, the switching frequency becomes critical here. Background technique [0002] In order to ensure optimal control of the electric motor, an offset timing is selected as control strategy. Here, the microcontroller modulates both edges of the PWM signal. Therefore, the motor gets the proper voltage pulse on each edge. This preferably happen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/28
CPCH02P21/28
Inventor M.格岑贝格尔
Owner VTESCO TECH GMBH
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