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Maximum torque current ratio control method of five-phase permanent-magnet motor under direct torque control

A maximum torque current, direct torque control technology, applied in motor control, motor generator control, control of electromechanical brakes, etc., can solve a large number of offline work storage space, torque, current ripple, motor parameter accuracy more demanding issues

Active Publication Date: 2019-04-12
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the parameter method has higher requirements on the accuracy of motor parameters, the table method requires a lot of offline work and a large storage space, and the signal injection method will cause additional torque and current ripple.

Method used

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  • Maximum torque current ratio control method of five-phase permanent-magnet motor under direct torque control
  • Maximum torque current ratio control method of five-phase permanent-magnet motor under direct torque control
  • Maximum torque current ratio control method of five-phase permanent-magnet motor under direct torque control

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Embodiment Construction

[0065] The specific embodiment mainly introduces the maximum torque current ratio control under DTC based on virtual signal injection, and its control block diagram is as follows figure 1 shown. The specific implementation manner and implementation effect of the embodiment will be described in detail below in conjunction with the accompanying drawings.

[0066] Step 1, detect the speed of the five-phase permanent magnet motor as the speed feedback of the motor ω m , the given speed ω ref and feedback speed ω m Comparing the speed error e of the motor r , using PI controller according to the speed error e r Calculate the reference torque of the five-phase permanent magnet motor, and the output of the PI controller is the reference torque T e_ref .

[0067] Step 2, use the current sensor to sample the current i of each phase of the five-phase permanent magnet motor α , i b , i c , i d , i e , and perform matrix transformation on the sampled current to obtain the prima...

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Abstract

The invention discloses a maximum torque current ratio control method of a five-phase permanent-magnet motor under direct torque control. The maximum torque current ratio control method comprises thesteps of detecting a rotational speed of the motor, comparing a given rotational speed Omega<ref> and a feedback rotational speed Omega<m>, and obtaining reference torque Te-ref by a PI controller; performing conversion matrix on a sampled phase current to obtain currents i<Alpha>, i<Beta>, i<Alpha 3> and i<Beta3> under a primary space Alpha-Beta and a third space Alpha3-Beta3 of a two-phase static coordinate system; calculating voltages u<Alpha>, u<Beta>, u<Alpha3> and u<Beta3> according to a switch signal; inputting u<Alpha>, u<Beta>, u<Alpha3> and u<Beta3> into a magnetic flux torque calculation model to solve flux linkage Psi<s> and torque Te of a motor stator; inputting Psi<Alpha>, Psi<Beta>, i<Alpha> and i<Beta> into a virtual signal module, and performing calculation to obtain compensation flux linkage Delta Psi<s> for allowing the motor to run at an MTPA point; and comparing the reference torque, the flux linkage, the motor torque obtained by calculation and the flux linkage, inputting to a switch table after a hysteresis controller to obtain each phase switch signal. The motor is controlled by the inverter, and MTPA control of the five-phase permanent-magnet motor under direct torque is achieved.

Description

technical field [0001] The invention relates to the field of multi-phase motor DTC control, in particular to a method for controlling the maximum torque-current ratio of a five-phase permanent magnet motor under DTC based on virtual signal injection. It is suitable for occasions with high energy demand and high efficiency requirements such as mining and iron smelting. Background technique [0002] The built-in permanent magnet synchronous motor (IPMSM) has the characteristics of high power density, high efficiency, high reliability, and wide constant power operating range, and is widely used in various industrial occasions. With the development of modern power electronic conversion technology and computer control theory, multi-phase motor drive system has been developed rapidly. Compared with three-phase internal magnet permanent magnet motors, multi-phase motors have higher power density and reliability, and are more suitable for aerospace, ship electric propulsion, electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/30H02P21/22H02P27/06
CPCH02P27/06H02P2205/05H02P21/22H02P21/30
Inventor 刘国海杨玉琪陈前赵文祥
Owner JIANGSU UNIV
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