Method and device for inverter to control over-excitation shutdown of motor

A frequency converter control and over-excitation technology, applied in the field of frequency converters, can solve problems such as commutation failure, high use cost, and complex control, and achieve the effects of improving reliability and operating efficiency, avoiding system failure points, and simple control methods

Active Publication Date: 2016-09-14
KINCO ELECTRIC SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method and device for inverter to control over-excitation shutdown of motor
  • Method and device for inverter to control over-excitation shutdown of motor
  • Method and device for inverter to control over-excitation shutdown of motor

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Embodiment Construction

[0043] The present invention utilizes the over-excitation of the motor to stop. When the motor is stopped, if the motor enters the power generation state due to the large rotor inertia, the frequency converter increases the excitation current of the stator to over-excite the motor and convert the excess electric energy into heat energy for consumption. In turn, the motor can be stopped as soon as possible without reporting an overvoltage or overcurrent fault.

[0044] like figure 1 As shown, the device 100 for frequency converter to control over-excitation shutdown of the present invention includes a frequency converter motor drive device 110, a frequency adjustment device 120, a bus voltage and phase current sampling circuit 102, a stator current decoupling calculation device 134, and an excitation circuit PI regulator 105 , a V / F output voltage calculation device 106 , an adder 107 , a voltage vector calculation module 108 , and a PWM duty cycle calculation module 109 . Whe...

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Abstract

The invention provides a method for a frequency converter to control motor over-excitation to stop. The motor is stopped by using the over-excitation. Over-excitation converts the excess electric energy into heat energy and consumes it, so that the motor will stop as soon as possible without reporting an overvoltage or overcurrent fault. The invention also provides a device for controlling the over-excitation shutdown of the motor by the frequency converter.

Description

technical field [0001] The invention belongs to the field of frequency converters, and in particular relates to a method and a device for a frequency converter to control motor over-excitation shutdown. Background technique [0002] Inverter is a device that converts fixed frequency alternating current into continuously adjustable frequency alternating current, and is widely used in various industries. Frequency conversion speed regulation has been recognized as one of the most ideal and promising speed regulation methods at that time. It is mainly used in energy saving, automation system and improving process level and product quality. [0003] After the motor stops, it needs to rotate for a period of time depending on the inertia, but many applications require the motor to stop quickly, such as cranes or hoists, spindles of machine tools, elevators, etc. In the application where the load driven by the motor has a large mechanical inertia, when the inverter controls the m...

Claims

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Application Information

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