Passive compensating and energy saving apparatus for digital large power winding asynchronous motor

An asynchronous motor and energy-saving device technology, applied in the output power conversion device, AC motor control, AC power input conversion to AC power output, etc. Ensuring reliable commutation

Inactive Publication Date: 2009-08-05
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, because the system only uses open-loop control, it is difficult to apply to

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  • Passive compensating and energy saving apparatus for digital large power winding asynchronous motor
  • Passive compensating and energy saving apparatus for digital large power winding asynchronous motor
  • Passive compensating and energy saving apparatus for digital large power winding asynchronous motor

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Embodiment Construction

[0013] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the present invention is realized in this way, and it includes motor, current sensor, starting cabinet, A / D converter, current zero-crossing detection circuit, single-chip microcomputer control circuit, frequency converter trigger pulse drive circuit, frequency converter main loop current detection circuit, power supply synchronous signal generation circuit, temperature measurement circuit, protection output drive circuit, solid state relay, transformer, AC frequency converter, relay control circuit, the current sensor is connected between the starter cabinet and the motor, and the characteristic is that the detection signals of the current sensor are respectively After passing through the A / D converter and the current zero-crossing detection circuit, it is input to the single-chip control circuit, and at the same time, the AC inverter power supply synchronization signal is input to the single-chip control ...

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Abstract

The invention provides a reactive power compensation and energy-saving device used for a digital large-power winding asynchronous motor, which is characterized in that the rotor current of the motor is detected by a current sensor; furthermore, the detection signal of the current sensor respectively passes by an A/D converter and a current zero-crossing detection circuit and is then input a singlechip control circuit; simultaneously, the synchronous signal of an AC-AC frequency converter power supply is input in the singlechip control circuit; the singlechip carries out data processing according to the mathematic model of the system and the triggering time procedure, outputs the AC-AC frequency converter trigger pulse signal, leads the output voltage frequency of the AC-AC frequency converter to be the same with the rotor current frequency of the asynchronous motor, leads the phase of the AC-AC frequency converter to be lagged by 90 degrees compared with the rotor current; furthermore, the output voltage is changed according to the change of the detection current. The reactive compensation power and energy-saving device has the advantages of realizing the close-ring control of power factor compensation of the winding-typed asynchronous motor, thus achieving the energy-saving object, and adopting the AC-AC frequency conversion current zero-crossing detection circuit with high reliability.

Description

technical field [0001] The invention relates to a reactive power compensation and energy-saving device for an asynchronous motor, in particular to a digital high-power winding asynchronous motor reactive power compensation and an energy-saving device. Background technique [0002] At present, the reactive power compensation methods of AC wound asynchronous motors at home and abroad mainly include: 1) Parallel capacitors on the motor stator side; parallel capacitors on the motor stator side can only compensate the reactive power of the line, and cannot reduce the stator current of the motor; especially for high-voltage capacitors The installation site and control method have special requirements, and the investment is often high. 2) The rotor circuit of the motor is connected in series with the rotary feeding device. Since the rotary input device connected in series to the rotor circuit of the motor is a commutator rotating motor, it has a certain power consumption, is parti...

Claims

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Application Information

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IPC IPC(8): H02P27/05H02M5/257
Inventor 肖慧荣柴明钢邹文栋
Owner NANCHANG HANGKONG UNIVERSITY
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