Direct power control system of high power factor induction motor

Abstract

A direct power control system of a high power factor induction motor realizes energy-saving control of a three-phase induction motor under the condition of light load or no load. The direct power control system of the high power factor induction motor comprises a controller using a digital signal processor TMS320F2808 as the core, a three-phase bridge power amplification device, a three-phase bridge driving circuit, the three-phase induction motor, a three-phase diode rectifier, a power factor detecting link, a current detecting link, an encoder rotating speed detecting link, a power factor measuring link, a + 24V switching power supply, a +15V switching power, a + / - switching power supply, a +5V switching power and the like. By means of the direct power control system applying power factor measurement, the stator flux linkage amplitude of the three-phase induction motor under the condition of light load or no load is controlled, instantaneous reactive power of the motor is adjusted, and therefore the motor power factor is effectively improved and a good energy-saving effect is achieved.

Description

technical field [0001] The invention relates to a direct power control system of a high power factor induction motor, which belongs to the field of power electronics and electric transmission, and is used for realizing energy-saving control of a three-phase induction motor under light-load or no-load working conditions. Background technique [0002] With the development of science and technology and the improvement of production level, the demand for electric energy is also increasing. Judging from the total power consumption of countries in the world, the electric energy consumed by motors accounts for about 60% to 70% of the total power generation. In the current situation of world energy shortage and insufficient electric energy supply, it is of great practical significance to deeply study the energy saving problem of electric motors. [0003] Three-phase induction motors are a type of AC motors widely used in industry. When three-phase induction motors operate under lig...

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Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the existing three-phase induction motor AC voltage regulation and energy-saving control method, because the thyristor AC voltage regulation is used, when the conduction angle is small, the current waveform appears intermittent, the power factor is difficult to detect, and It avoids the problem of affecting the safe operation of voltage regulation and energy-saving inverters when the three-phase imbalance of the power grid is serious, and provides a direct power control system for three-phase induction motors, which greatly improves the operating efficiency of three-phase induction motors under light-load or no-load conditions.

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