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Smooth electromagnetic braking method and device suitable for brushless DC motor

A brushed DC motor and electromagnetic braking technology, which is applied in the direction of stopping devices and torque ripple control, can solve problems such as fluctuations, insufficient braking torque, and unresolved commutation torque, so as to avoid mechanical loss , to achieve the effect of torque and improve flexibility

Active Publication Date: 2019-01-29
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, regenerative braking alone cannot provide sufficient braking torque when the speed is low, and the above methods do not solve the problem of commutation torque fluctuations in the braking state.

Method used

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  • Smooth electromagnetic braking method and device suitable for brushless DC motor
  • Smooth electromagnetic braking method and device suitable for brushless DC motor
  • Smooth electromagnetic braking method and device suitable for brushless DC motor

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specific Embodiment

[0111] (1) Calculate ω according to formula (2) cut =26.2rad / s, converted to speed n cut =250.1r / min.

[0112] (2) Calculate ω according to formula (7) con =20.9rad / s, converted to speed n con =199.7r / min.

[0113] (3) The maximum value of torque fluctuation allowed in this embodiment is ΔT=0.2N·m, by Δi=ΔT / (2K e ) to obtain the maximum current variation corresponding to the maximum torque ripple as Δi=0.78A.

[0114] (4) put ω cut , ω con Substituting and Δi into the modulation strategy switching judgment process is Figure 5 .

[0115] (5) Write the subsection PI control algorithm as the main controller algorithm. see Image 6 , the segmented PI controller in this embodiment consists of three traditional PI controllers f 1 , f 2 and f 3 , whose outputs are respectively d 1 、d 2 and d 3 . where controller f 1 The low-speed zone [0, n*] controlling the braking state, n* is determined by the modulation strategy switch judger; the controller f 2 and f 3 Contr...

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Abstract

The invention belongs to the control technical field of a brushless direct current motor, and provides a braking method for maintaining non-fluctuation of electromagnetic torque communication and controllable magnitude of braking torque; the torque control performance of the motor under a braking state can be improved; and in the process, fluctuation of communication torque does not exist, and the control performance is not affected by the rotary speed of the motor. According to the technical scheme provided by the invention, the stable electromagnetic braking method applicable to the brushless direct current motor comprises two steps of modulation strategy switching and commutation current control, wherein the step of modulation strategy switching is carried out by performing reasonable partitioning on the rotary speed of the motor according to specific motor parameters and requirements of a designer; the rotary speed of the motor is partitioned into a high-speed region and a low-speed region; feedback braking which refers to a modulation strategy 1 is adopted in the high-speed region while plug braking which refers to a modulation strategy 2 is adopted in the low-speed region; the step of commutation current control is carried out by designing a commutation duty ratio compensation controller; the commutation duty ratio compensation controller is matched with a main controller to form a current controller; and finally, a proper commutation duty ratio is calculated. The stable electromagnetic braking method and apparatus are mainly applied to the design and manufacturing occasions of the brushless direct current motor.

Description

technical field [0001] The invention belongs to the technical field of brushless DC motor control, and relates to a stable control method for electromagnetic braking torque of a brushless DC motor. Background technique [0002] Brushless DC motors are widely used in aerospace, industrial production and household appliances due to their small size, high reliability, and large output torque. However, large torque fluctuations will affect the high-quality operation of brushless DC motors in some fields. For example, in electric vehicles and electric bicycles, torque fluctuations will reduce the comfort of passengers and the safety of vehicles. In servo control On the CNC machine tool, the torque fluctuation will affect the machining accuracy of the parts and reduce the qualified rate of the product. [0003] The torque fluctuation of the brushless DC motor mainly comes from the commutation torque fluctuation. At present, the torque fluctuation suppression methods in the elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/24H02P6/10
CPCH02P6/10H02P6/24
Inventor 史婷娜牛兴卓李新旻陈炜夏长亮
Owner TIANJIN UNIV
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