Intelligent protection method and device for constant torque starting and overloading of direct current motor

An intelligent protection, DC motor technology, applied in the direction of a single DC motor starter, AC motor speed reducer, emergency protection circuit device, etc., can solve the short duration shutdown protection, reduce the robustness and duration of the drag system Long and other problems, to achieve the effect of shortening the start-up time, overcoming the problem of misoperation, and strong versatility

Active Publication Date: 2019-07-16
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Problems solved by technology

However, under normal circumstances, when there is an instantaneous overload, although the impact current is large, it should not be shut down due to the short duration, or the overload impact current has not reached the set threshold, but due to the long duration, timely protection and

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  • Intelligent protection method and device for constant torque starting and overloading of direct current motor
  • Intelligent protection method and device for constant torque starting and overloading of direct current motor
  • Intelligent protection method and device for constant torque starting and overloading of direct current motor

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[0035] The technical solution and system working principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] On the basis of summarizing the existing motor starting methods and overcurrent protection measures, the present invention proposes a DC separate excitation or permanent magnet motor constant torque starting and overload intelligent protection method, and a corresponding control device is designed accordingly. One of the purposes is to effectively solve the contradiction between the limited starting current of the motor and the maximum starting torque, so as to achieve the fastest start of the motor under the premise of the current that the armature allows to pass; the second purpose is to reasonably solve the problem of motor stability. In the process of operation, when the energy of the overload impulse current is large, safety protection should be carried out in time, and when the energy of the overload ...

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Abstract

The invention relates to the technical field of motor drive and control, in particular to an intelligent protection method and device for constant torque starting and overloading of a separately excited or permanent magnet direct current motor. The device comprises a current closed-loop adjusting unit, a pulse width adjusting unit and a control unit. According to the protection method, intelligentprotection of constant torque starting control and overloading of the direct current motor is realized through motor working current closed-loop detection, a PI adjustor, a PWM variable voltage control technology and a current square attenuation algorithm. The motor is safely started at the maximum speed in an electric drive process, and the motor is scientifically and reasonably protected when the motor is instantaneously overloaded due to load disturbance in a steady-state operation process, so that the working efficiency and the performance of the motor and the robustness of an electric drive system are improved as much as possible on the premise of ensuring safe application of the motor.

Description

technical field [0001] The invention relates to the technical field of motor drive and control, in particular to a constant torque starting and overload intelligent protection method and device for separately excited or permanent magnet DC motors. Background technique [0002] In industrial and agricultural production, a large number of large and medium-sized electric motors are used as prime movers to drive various production machinery and equipment. In the field of automation, various small control motors are widely used as detection, amplification and execution components. As an important branch of the motor field, DC motors have been widely used in modern life due to their good speed regulation performance, wide speed regulation range, large torque and good starting characteristics. [0003] In the process of electric dragging, DC motors often need to be started. The basic requirement for optimal starting is that the starting torque be as large as possible to shorten th...

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Application Information

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IPC IPC(8): H02P1/18H02H7/085H02P29/028
CPCH02H7/0855H02P1/18H02P29/028
Inventor 白海城
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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