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Motor control method and control system thereof

A technology of motor control and controller

Active Publication Date: 2017-03-08
维谛新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a motor control method and its control system for the defects that the switch vector table of direct torque control is troublesome in construction and the switching frequency of power devices is not fixed in the prior art

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  • Motor control method and control system thereof
  • Motor control method and control system thereof

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Embodiment Construction

[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0047] The present invention provides a motor control method and a control system thereof, the purpose of which is to replace the hysteresis comparison link of flux linkage and torque in the prior art direct torque control with a PI regulator of electronic flux linkage and torque, and The switching vector table is replaced by the carrier phase-shifting PWM wave transmission method, which avoids the construction of the switching vector table and achieves the purpose of fixing the switching frequency.

[0048] see figure 2 , figure 2 A schematic diagram of a motor control system 100 provided by t...

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Abstract

The invention discloses a motor control method and a control system thereof. The motor control method comprises steps that feedback torque and flux linkage information are calculated according to three-phase current and three-phase voltage of a motor; a torque calculation module calculates a preset speed signal and feedback torque to obtain torque loop output voltage; a flux linkage calculation module calculates a flux linkage given value and the flux linkage information so as to obtain flux linkage loop output voltage; an inverse transformation module coverts the torque loop output voltage and the flux linkage loop output voltage into system three-phase voltage and transmits the system three-phase voltage to a carrier phase-shifting module; the carrier phase-shifting module outputs a modulating signal to a driving module according to the system three-phase voltage; and the driving module carries out direct torque control on the motor according to the modulating signal. The beneficial effects are that: construction of a switch vector table is avoided and an objective of fixed switch frequency is achieved.

Description

technical field [0001] The present invention relates to the technical field of motor control, and more specifically, to a motor control method and a control system thereof. Background technique [0002] As an advanced motor control method, direct torque control has been applied to low-voltage inverters due to its fast torque response. However, due to some special characteristics of H-bridge cascaded medium-voltage inverters, such as: switching frequency The control and the establishment of the switch vector table have become the factors restricting the application of direct torque control on the H-bridge cascaded medium voltage inverter. [0003] The principle of direct torque control in the prior art is generally to directly control the flux linkage and torque of the motor as control variables. Its schematic diagram is as follows figure 1 as shown, figure 1 is the schematic diagram of direct torque control in the prior art, figure 1 In the system, the speed closed loop ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/20H02P27/12
Inventor 赵大帅刘家颂
Owner 维谛新能源有限公司