Tri-phase induction motor driving system and driving method thereof

Abstract

A system and method for driving a three-phase induction motor, wherein an inverter power module is provided to supply voltages of three phases to the three-phase induction motor to drive it, a plurality of power supplies are provided to supply powers to a plurality of power devices constituting the inverter power module, and an insulator is provided to insulate the plurality of power supplies and the power module from each other. The present invention can minimize interferences based on a difference between voltages continuously applied to the inverter power module while the three phase voltages are supplied from the inverter power module to the three-phase induction motor. Furthermore, a plurality of photocouplers and a plurality of driving devices constituting the insulator are disposed on a printed circuit board in such a manner that they are spaced apart from one another, thereby minimizing interferences among powers, the amount of abnormal leakage and the effect of a voltage variation on the three-phase induction motor.

Description

technical field [0001] The present invention relates to a three-phase induction motor driving system and its driving method, and particularly relates to a device capable of preventing interference caused by potential differences of three-phase voltages in driving a three-phase induction motor and isolating a power supply unit and driving components on a printed circuit board. A three-phase induction motor drive system and a drive method thereof. Background technique [0002] The use of three-phase induction motors other than single-phase induction motors to drive the compressors of air-conditioning devices has greatly increased. In particular, three-phase induction motors can supply high power to the compressors of air-conditioning devices at a voltage of about 380V. Compared with single-phase induction motors that can supply power at 220V, their application range is expanding. [0003] based on the following figure 1 A drive system for driving such a three-phase induction...

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Problems solved by technology

[0007] However, as described above, since the plurality of power elements are continuously turned on / off during the driving of the three-phase induction motor, the DC voltage of 540V is momentarily and repeatedly applied to the plurality of power elements and then cut off.

Therefore, there is a problem that an unnecessary voltage or signal interference phenomenon is caused between the circuits of the inverter power module part due to the voltage applied from the plurality of power elements.

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