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Motor overexcitation halting method and device by frequency changer control

A frequency converter control and overexcitation technology, applied in the field of frequency converters, can solve the problems of commutation failure, high use cost, complicated control, etc., and achieve the effects of improving reliability and operating efficiency, avoiding system failure points, and simple control methods.

Active Publication Date: 2014-10-15
KINCO ELECTRIC SHENZHEN
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  • Abstract
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Problems solved by technology

[0010] Disadvantages of regenerative braking: regenerative braking can only be used under a stable grid voltage that is not prone to failures, otherwise commutation failures will easily occur and components will be damaged; regenerative braking will cause harmonic pollution to the grid, and its control Complicated and expensive to use

Method used

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  • Motor overexcitation halting method and device by frequency changer control
  • Motor overexcitation halting method and device by frequency changer control
  • Motor overexcitation halting method and device by frequency changer control

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Embodiment Construction

[0043] The present invention uses the motor to stop the motor. When the motor is stopped, if the motor is large due to the large rotor, the motor enters the power generation state, and the inverter will increase the motor to the motor by increasing the stator in the power current.Then make the motor shut down as soon as possible without reporting overvoltage or overcurrent.

[0044] like figure 1 Show, the inverter of the inventor controls the device 100 of the inspirational stops includes the inverter motor drive device 110, the frequency adjustment device 120, the bus voltage and phase current sampling circuit 102, the stator current decoupling computing device 134, the PI regulator of the excitation circuit PI regulator105, V / F output voltage calculation device 106, adding magazine 107, voltage vector calculation module 108, PWM duty cycle calculation module 109.Among them, the stator current decoupled calculus computing device 134 further includes, and the PARK transformation ...

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Abstract

The invention provides a motor overexcitation halting method by frequency changer control. Halting is performed by motor overexcitation, when a motor halts, if the motor enters a power generating state due to large rotor inertia, exciting current of a stator is increased by a frequency changer so that motor overexcitation occurs, extra electric energy is converted into heat energy to be consumed, the motor can halt as soon as possible, and overvoltage or overcurrent faults can not be reported. The invention further provides a motor overexcitation halting device by frequency changer control.

Description

Technical field [0001] The invention is the field of inverter, which specializes in a method of controlling motor to control motor analogyle and its device. Background technique [0002] The inverter is a device that transforms the AC electricity of fixed frequency into a frequency -frequency and adjustable AC power, which is widely used in various industries in the industry.The variable frequency speed adjustment has been recognized as one of the most ideal and promising speed adjustment methods. Its main application is in terms of energy conservation, automation system, and improvement of process level and product quality. [0003] The motor rely on the inertia after being stopped for a period of time to stop, but many applications require that the motor can stop quickly, such as cranes or rolling machines, the main axis of the machine, and lifts.In the application in the application of the motor dragging load, when the inverter controls the motor from high to low speed (zero -...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P3/18
Inventor 王茂峰
Owner KINCO ELECTRIC SHENZHEN
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