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Direct torque control method and device of brushless continuous current dynamo

A technology of direct torque control and brushed DC motor, applied in the direction of single motor speed/torque control, electronic commutator, etc., can solve the problems of large torque ripple and high complexity of torque calculation, and reduce the control cycle , Realize torque ripple suppression and improve the effect of torque hysteresis regulator

Inactive Publication Date: 2012-10-03
YANSHAN UNIV
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  • Abstract
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a direct torque control method and device for a brushless DC motor to overcome the defects of high torque calculation complexity and large torque ripple in the case of small inductance in the prior art

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  • Direct torque control method and device of brushless continuous current dynamo
  • Direct torque control method and device of brushless continuous current dynamo
  • Direct torque control method and device of brushless continuous current dynamo

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Embodiment Construction

[0065] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0066] A direct torque control method of a brushless DC motor according to an embodiment of the present invention is as follows: figure 1 shown, including the following steps:

[0067] Step s101, according to the actual rotational speed and command rotational speed of the brushless direct current motor, obtain the given torque of the brushless direct current motor.

[0068] Step s102, according to the rotor position of the brushless direct current motor and the three-phase current value of the input end of the brushless direct current motor, the estimated torque of the brushless direct current motor is obtained.

[0069] Step s103, obtaining a first duty ratio according ...

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Abstract

The invention belongs to the field of control technology of brushless continuous current dynamo, and discloses a direct torque control method of a brushless continuous current dynamo. The method comprises the following steps: A. a preset torque is obtained according to the actual rotational speed and the command rotational speed of the dynamo; B. an estimating torque is obtained according to the rotor position and the three-phase current value of the input end of the dynamo; C. a first duty ratio is obtained according to the preset torque and the estimating torque, and is added with a second duty ratio related to the speed, and then a final duty ratio is obtained; D. the state of a switch tube is selected according to the final duty ratio, the rotor position and the plus-minus of the preset torque; E. an inverter is controlled to drive the dynamo to rotate according to the state of the switch tube. The invention also discloses a direct torque control device of the brushless continuous current dynamo. According to the invention, a linear counter emf form factor is adopted to calculate the torque, and control period is shortened; PWM (pulse width modulation) technology is combined, and a torque hysteresis regulator is improved, so that torque pulsation inhibition when the inductance of the dynamo is small is realized, and four-quadrant operation of the brushless continuous current dynamo is also realized.

Description

technical field [0001] The invention belongs to the technical field of brushless direct current motor control, and in particular relates to a direct torque control method and device of a brushless direct current motor with torque hysteresis loop adjustment. Background technique [0002] Brushless DC motor is a kind of special motor that uses electronic commutation to solve the disadvantages of traditional DC motor's mechanical commutation. It is also considered to be one of the most promising and widely used motors in this century. It is used in aerospace systems, It has been widely used in scientific instruments, transportation, national defense and military equipment, medical equipment, industrial automation equipment and other fields. However, in the application process, four-quadrant operation conditions including forward and reverse electric and braking are often encountered, and the torque ripple problem of the brushless DC motor also limits its application occasions. ...

Claims

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Application Information

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IPC IPC(8): H02P6/06H02P6/16H02P6/17
Inventor 李珍国章松发周生海
Owner YANSHAN UNIV
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