Counter electromotive force space vector-orientedinstantaneous torque control method for brushless direct current motor

A technology of brush DC motor and space vector, which is applied in the field of instantaneous torque control of back EMF space vector oriented brushless DC motor, which can solve the problem that the off-phase current cannot be ideally commutated, the utilization rate of winding is low, and the brushless DC motor cannot Three-phase conduction control and other issues

Active Publication Date: 2016-05-04
唐山先施重工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the production process, the magnetic field generated by the rotor of the brushless DC motor is not an ideal trapezoidal wave. The 120-degree square wave current will inevitably produce torque ripple; in the commutation area, the off-phase current and the on-phase current cannot be commutated ideally, causing commutation torque ripple, which in turn limits its development in the high-precision field
At the same time, the brushless DC motor adopts tw

Method used

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  • Counter electromotive force space vector-orientedinstantaneous torque control method for brushless direct current motor
  • Counter electromotive force space vector-orientedinstantaneous torque control method for brushless direct current motor
  • Counter electromotive force space vector-orientedinstantaneous torque control method for brushless direct current motor

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with accompanying drawing:

[0052] The rotor rotates at a constant speed, and the opposite potential changes according to the non-sinusoidal law. Taking the axis of the A-phase winding as the starting point of the rotor, the rotor rotates 360° electrical angle, and the opposite potential changes of the three phases A, B, and C are as follows: figure 1 shown.

[0053] Take the axes of A, B, and C three-phase windings as the starting angles of each phase, and among the space vectors of opposite potentials, take the respective maximum value as the modulus of the space vectors; since the three-phase windings are symmetrical, the space vectors of each opposite potential The magnitudes of the moduli are equal; take the ratio of the actual opposite potential value to the respective modulus, and then take the angle obtained by the arcsine function as the space vector angle of the opposite potential; introduce...

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Abstract

The invention discloses acounter electromotive force space vector-oriented instantaneous torque control method for a brushless direct current motor. The method comprises the steps of establishing a d-q rotating coordinate system which is orientated based on counter electromotive force; and deducing a torque computation formula under the d-q rotating coordinate system, thus proving that the actual torque Teof the motor is directly proportional to q-axis current. A, B and C three-phase current set values can be worked out through the given d-axis and q-axis current values, and the utilization rate of the winding is improved by using a three-phase breakover PWM modulation strategy applicable to the brushless direct current motor. As the control method adopts the three-phase breakover control mode, no commutation torque ripple occurs. The control mode is used during the whole operation period, separate division of a commutation region for control is not needed, the computation is simplified, and the implementation is simpler.

Description

technical field [0001] The invention relates to the field of brushless direct current motor control, in particular to a method for instantaneous torque control of a back EMF space vector oriented brushless direct current motor. Background technique [0002] Brushless DC motors are used in many fields due to their high working efficiency, simple structure, low maintenance costs, large output, long life, and wide speed range. Brushless DC motors usually work in a two-phase, three-phase, six-state working mode, which can make full use of the flat top part of the trapezoidal magnetic field of the brushless DC motor and increase torque stability. [0003] However, due to the production process, the magnetic field generated by the rotor of the brushless DC motor is not an ideal trapezoidal wave. The 120-degree square wave current will inevitably produce torque ripple; in the commutation area, the off-phase current and on-phase current cannot be ideally commutated, causing commuta...

Claims

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Application Information

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IPC IPC(8): H02P21/00
CPCH02P21/0003
Inventor 李珍国王江浩高雪飞刘乐
Owner 唐山先施重工有限公司
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