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Electric motor control method and device adopting space vector pulse width modulation

A pulse width modulation and vector modulation technology, which is applied to the motor control device using space vector pulse width modulation and the motor control field using space vector pulse width modulation, can solve the real-time control that cannot meet the high performance, and the cost of space vector control device improvement, etc.

Active Publication Date: 2008-05-07
CHERY AUTOMOBILE CO LTD
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  • Abstract
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Problems solved by technology

The above problems cause the cost of the space vector control device to increase, and cannot meet the requirements of high-performance real-time control

Method used

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  • Electric motor control method and device adopting space vector pulse width modulation
  • Electric motor control method and device adopting space vector pulse width modulation
  • Electric motor control method and device adopting space vector pulse width modulation

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Embodiment Construction

[0064] The first embodiment of the present invention provides a motor control method using space vector pulse width modulation. This embodiment is used to provide PWM control signals to the three-phase bridge inverter shown in FIG. 1 . The provided PWM control signal enables the three-phase bridge inverter to output three-phase alternating current, and the three-phase alternating current obtains a circular rotating magnetic field at a required speed on the stator of the motor, so that the rotor of the motor outputs a corresponding rotational speed.

[0065] The specific steps of the control method provided by this embodiment are as follows: First, calculate the three-phase vector modulation signal u according to the current motor operation detection data and command data a * , u b * , u c * , to the above three-phase vector modulation signal u a * , u b * , u c * Add the zero-sequence component to get the SVPWM three-phase modulation signal u of the carrier cycle a ...

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Abstract

The present invention discloses a motor control method which uses a Space Vector Pulse Width Modulation (SVPWM). Data and instruction data are detected according to the operation state of the motor of the present carrier wave period and the modulation signal of each phase SPWM vector corresponding to the carrier wave period is computed. According to the modulation signal of each SPWM vector, the zero sequence component of the carrier wave period is added and the modulation signal of each phase SVPWM vector in the carrier wave period is obtained. The duty cycle of each phase of the carrier wave period is obtained according to the modulation signal of the SVPWM vector. Based on the duty cycle of the carrier wave period, a PWM control signal corresponding to each phase is generated. According to the PWM control signal, a PWM driving signal of the upper and lower bridge arms of a corresponding inverter is generated to control the turning on or off of each bridge arm of the inverter during the present carrier wave period. The method and device of the present invention have few steps to obtain the SVPWM signal, a simple computation and can use a cheaper chip to control the motor real time.

Description

technical field [0001] The invention relates to motor control technology of pulse width modulation, in particular to a motor control method using space vector pulse width modulation. The invention also provides a motor control device using space vector pulse width modulation. Background technique [0002] In recent years, the space vector theory of the motor has been introduced into the inverter and its control. The basic principle is to use different combinations of the switch control signals of each bridge arm of the inverter to make the running track of the space vector of the output voltage of the inverter As close to a circle as possible, use this output voltage to power the motor to run smoothly at the desired speed. [0003] The following takes the three-phase bridge voltage inverter as an example to illustrate its space vector control method. The basic function of the three-phase bridge voltage inverter is to convert the DC bus voltage Ud into a three-phase AC volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/06H02P6/08
CPCH02P27/12
Inventor 谢美娟林伟义方运舟
Owner CHERY AUTOMOBILE CO LTD
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