Permanent magnet motor controller with voltage dip protection function

A permanent magnet motor, voltage sag technology, applied in the direction of AC motor control, single motor speed/torque control, emergency protection circuit device, etc., can solve the personal danger of operators, production line work disorder, microprocessor control program disorder And other issues

Inactive Publication Date: 2015-04-15
NINGDE NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, when the power supply voltage is lower than 80% of the nominal value, it will often cause the microprocessor control program to be disordered, and at the same time cause some power electronic devices to malfunction, which will affect the normal operation of the motor and even cause the motor to stop. cause economic loss
Especially for continuous production of petroleum and chemical enterprises, the motor is often interlocked with a series of mechanical mechanisms, and the short-term voltage drop of the power grid will often cause disorder or even paralysis of the entire production line, causing huge losses to economic production, and even bring harm to the operators. Personal danger, so voltage drop protection is necessary for industrial production

Method used

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  • Permanent magnet motor controller with voltage dip protection function
  • Permanent magnet motor controller with voltage dip protection function

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] See figure 1, this embodiment provides a permanent magnet motor controller with voltage sag protection, which is characterized in that it includes a three-phase rectification module A, a filter circuit D, a three-phase voltage detection module U, a high-frequency transformer Y, and a voltage extraction circuit G , current transformer K1, signal conditioning circuit K2, isolation drive circuit O, fault detection module L1, signal processing isolation module L, backup power charging circuit Z, backup power voltage detection circuit Z2, isolated linear sampling circuit Z3, optocoupler isolation Drive circuit Z19, constant current charging circuit CC, charging current detection circuit A1, upper computer monitoring platform COM, constant voltage charging circuit CV, inverter bridge protection circuit (M1), position detection module (EN), high frequen...

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Abstract

The invention relates to a variable frequency control device of a permanent magnet synchronous motor for voltage dip protection. The device can realize a variable frequency speed regulation function for the permanent magnet synchronous motor and automatically detect a network voltage condition in real time, judges the starting time and the stopping time of voltage dip by compiling a microprocessor software program, and ensures that the operation condition of the motor is unaffected when the motor has the voltage dip. In addition, and the adjustable voltage dip protection time can be set according to a hardware key and an upper computer monitoring system.

Description

technical field [0001] The invention relates to the field of permanent magnet motor controllers, in particular to a permanent magnet motor controller with voltage drop protection. Background technique [0002] Rare earth permanent magnet synchronous motor is a kind of high-performance motor with high efficiency, high power factor, no excitation loss, etc. It has been widely used in household, automotive industry, textile industry, oil field and mine. The invention takes the rare earth permanent magnet synchronous motor used in the oil field as the control object, and designs a control system with the function of anti-voltage drop protection. The biggest feature of oil pumping motors for oil fields is that the load is large during the upstroke; the load is small and the efficiency is low during the downstroke. As the oil well gradually becomes deeper during the oil pumping process of the oil pumping motor, its load also gradually decreases. The motor speed and load are not c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P27/06H02H7/08
Inventor 许志红苏晶晶郑乃清吴必瑞王洪涛
Owner NINGDE NORMAL UNIV
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