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Magnetic linkage self-control direct torque control method of brushless DC motor

A direct torque control, brushed DC motor technology, applied in the direction of a single motor speed/torque control, electronic commutator, etc., can solve the problem of complex system control methods, to suppress torque fluctuations, simplify the system, overcome magnetic Estimation of chains and effects of given difficulty

Inactive Publication Date: 2010-07-21
HARBIN INST OF TECH
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Problems solved by technology

[0009] The purpose of the present invention is to provide a flux linkage self-controlling direct torque control method of a brushless DC motor, which solves the problem that the existing method makes the system control method complicated due to the double closed-loop adjustment of torque and motor flux linkage

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  • Magnetic linkage self-control direct torque control method of brushless DC motor
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  • Magnetic linkage self-control direct torque control method of brushless DC motor

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specific Embodiment approach 1

[0018] Specific implementation mode one: the following combination Figure 1 to Figure 8 Describe this embodiment mode, this embodiment mode first rectifies the power supply AC power source 1 of power frequency through rectifier 2, then obtains DC power source through filter capacitor 3 filtering, then converts described DC power source into AC power source by inverter 4 for the described Brushless DC motor power supply; its control method is:

[0019] Collect the three-phase current value at the input end of the brushless DC motor, and perform three-phase-two-phase coordinate transformation on the three-phase current value, and obtain the component i of the three-phase current value at the input end of the brushless DC motor in the two-phase stationary coordinate system α i β ; Collect the three-phase voltage value of the brushless DC motor input end, and carry out three-phase-two-phase coordinate transformation to the three-phase voltage value, obtain the component of the t...

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Abstract

The invention relates to a magnetic linkage self-control direct torque control method of a brushless DC motor, and belongs to the field of speed regulation of brushless DC motors. The control method solves the problem that the existing method complicates a system control method due to the adoption of double closed-loop regulation of torque and motor magnetic linkage. The control method comprises the following steps: calculating by using a speed calculation unit according to a signal output by a position sensor to obtain a rotor angular velocity of the brushless DC motor; estimating the back-emf of the motor by using a back-emf sliding mode observer according to a current value, a voltage value and the rotor angular velocity; calculating by using the torque estimation unit to obtain the torque Te of the brushless DC motor; regulating by using a torque hysteresis regulator to obtain a control parameter tau after solving the difference between the Te and the predetermined torque Te<*> of the brushless DC motor; and combining the signal output by the position sensor, and generating a corresponding switching signal by a voltage vector selecting unit to control an inverter so as to drive the brushless DC motor to operate. The magnetic linkage self-control direct torque control method is used for the speed regulation control of the brushless DC motor.

Description

technical field [0001] The invention relates to a flux linkage self-control direct torque control method of a brushless direct current motor, which belongs to the field of speed regulation of the brushless direct current motor. Background technique [0002] Compared with DC motors, brushless DC motors save the commutator and brushes, and have the advantages of durability, maintenance-free, low noise, high efficiency and high power density, etc., and have been increasingly widely used in industry, aerospace and other fields . Permanent magnet brushless DC motors can be divided into square wave magnetic field brushless DC motors and sine wave magnetic field permanent magnet synchronous motors according to the shape of the magnetic field. Square wave magnetic field brushless DC motors are commonly referred to as brushless DC motors. Compared with magnetic synchronous motor, it has the advantages of simple control and low cost. However, due to the non-ideal back electromotive ...

Claims

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Application Information

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IPC IPC(8): H02P6/16H02P6/06H02P6/17
Inventor 赵克安群涛孙力孙立志吴凤江
Owner HARBIN INST OF TECH
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