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Feedback brake control method for direct current brushless motor

A technology of brushless DC motors and control methods, applied in the direction of stopping devices, etc., can solve the problems of large dynamic fluctuations, low reliability, and many limiting factors, achieve high-efficiency feedback braking, reduce circuit voltage drop, and reduce The effect of power loss

Inactive Publication Date: 2018-11-30
SHANGHAI DIANJI UNIV
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  • Claims
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Problems solved by technology

[0003] The maximum allowable braking torque control method can provide the maximum feedback current, but its dynamic fluctuation of braking is large and its reliability is low; the control method based on energy feedback curve can achieve safe and stable braking, but there are many limiting factors , the complex control

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  • Feedback brake control method for direct current brushless motor
  • Feedback brake control method for direct current brushless motor
  • Feedback brake control method for direct current brushless motor

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Embodiment Construction

[0019] Regenerative braking generally occurs when the motor speed is lower than the rated speed, so it is called low-speed energy regenerative braking. During the braking process, the motor generates electromagnetic torque opposite to the running direction, and at the same time converts the kinetic energy of the motor into electrical energy and feeds it back to the battery. But only when the motor terminal voltage is higher than the DC side terminal voltage, the motor can output electric energy to the battery. During low-speed energy regenerative braking, the amplitude 2e of the line potential after the two-phase windings of the motor are connected in series is always lower than the DC bus voltage Ud of the battery, so it cannot be directly fed back. Since the motor winding is an inductive element, the boost chopper principle can be used. During one PWM cycle, when t 0 ~t 1 When , the winding inductance stores energy, and the loop current rises, this stage is called the fre...

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Abstract

A feedback brake control method for a direct current (DC) brushless motor is based on brake control of synchronous rectification, wherein VT1, VT2, VT3, VT4, VT5 and VT6 are three-phase modulation switch tubes of the DC brushless motor, the DC brushless motor also has three states in a cycle, and phase changing is performed once every 120 degrees of an electrical angle. In the freewheeling phase regarding 0 to 2pi / 3 as an interval, VT6 is turned on simultaneously while VT4 is modulated to be turned on instead of VD6 as a freewheeling loop, the current loop is phase A to VT4 to VT6 to phase B,and in the charging phases of 2pi / 3-4pi / 3 and 4pi / 3-2pi, VT1 is turned on simultaneously while the VT4 is modulated to be turned off instead of the VD1 as a charging loop, and the current loop is phase A to VT1 to power supply anode to power supply cathode to VT6 to phase B.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a feedback braking control method of a DC brushless motor. Background technique [0002] Brushless DC motors have been widely used in electric vehicle drive systems due to their advantages such as no commutator and good speed regulation performance. During the operation of an electric vehicle, it is sometimes necessary to decelerate or brake according to the actual situation. The common braking methods include mechanical braking and electrical braking, and the electrical braking methods include energy consumption braking, reverse braking and feedback system. Dynamic and mechanical braking directly convert mechanical energy into heat energy, and the braking method is simple and reliable; dynamic braking is to convert the kinetic energy of the system into electrical energy and consume it on the braking resistor; reverse connection braking is to connect the motor w...

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Application Information

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IPC IPC(8): H02P6/24
CPCH02P6/24
Inventor 贾竹青陆永耕杨鑫程松辽袁红杰
Owner SHANGHAI DIANJI UNIV
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