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Starting procedure of open-loop vactor control in synchronous machine

A synchronous motor and vector control technology, applied in the starter, vector control system, motor generator control and other directions of a single synchronous machine, can solve the problem of not eliminating system errors, and achieve the effect of reliable starting

Inactive Publication Date: 2002-05-22
ABB AS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

While one method can take several measurements in each direction and calculate the average from the measured inductance, this method does not eliminate the effect of systematic errors

Method used

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  • Starting procedure of open-loop vactor control in synchronous machine
  • Starting procedure of open-loop vactor control in synchronous machine
  • Starting procedure of open-loop vactor control in synchronous machine

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Embodiment Construction

[0023] According to the present invention, start-up of open-loop vector control in a synchronous machine firstly involves determining the stator inductance model L of the synchronous machine s =L s0 +L s2 cos2θ r A step of. This equation tells how the inductance varies according to the rotor angle in the stationary frame. Thus this equation shows that when the rotor rotates by a certain angle θ r How does the inductance measured in the x-axis direction of the stator coordinate system change when ?

[0024] When it is desired to determine the initial rotor angle, it is not possible to rotate at different rotor azimuths to measure inductance. Instead, the stator coordinate system is rotated to an angle, and the inductance is measured in this direction. These rotatable stator frames are called virtual stator frames. image 3 Various coordinate systems are shown, and it is noted that the stator coordinate system is the coordinate system xy, the virtual stator coordinate sys...

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Abstract

A method for starting an open-loop vector control, includes steps of: determining a stator inductance model of the machine; measuring the stator iductance in a plurality of directions; arranging the measured inductances in the model to form model parameters resulting in minimum error; checking the polarity of rotor magnetization to verify the direction thereof; initializing flux linkages of the open-loop vector control according to the model parameters and the direction of rotor magnetization; and starting the machine by the open-loop vector control method.

Description

technical field [0001] The invention relates to a method for starting an open-loop vector control in a synchronous motor. The method includes judging the stator inductance mode of the synchronous motor and measuring the stator inductance in multiple directions. Background of the invention [0002] Vector control refers to a method of controlling an AC motor, which enables the flux linkage and torque of the motor to be independently controlled like a DC motor. In a DC motor, the direct current which affects the flux linkage and torque is controlled, while in an AC motor the amplitude and phase angle of the current must be controlled. Thus, the current vector is controlled, thereby realizing vector control. [0003] To perform vector control, the flux linkage and current of the motor must be known. The flux linkage of the motor is generated by the current action of the stator and rotor when the motor is induced. In a synchronous machine, the rotor current must be estimated ...

Claims

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Application Information

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IPC IPC(8): H02P1/52H02P6/20H02P21/34H02P27/06
CPCH02P21/0032H02P6/20H02P21/34H02P21/00
Inventor 朱利尤斯·鲁可
Owner ABB AS
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