Motor system capable of lowering common mode noise

Abstract

The invention provides a motor system that can reduce common mode noise. The motor system comprises an AC power supply, a first transformer unit and a second transformer unit, wherein, the first transformer unit and the second transformer unit are connected with the AC power supply and can provide DC voltage; and the DC voltage of the first transformer unit and the DC voltage of the second transformer unit respectively supply a drive part and a control part of the motor system, thereby reducing the common mode noise coupling to a control power supply winding through a transformer winding at the drive part. Furthermore, stopping signals can close a pulse-width modulation integrated circuit of the power supply through an optical coupler or a relay, thereby leading the first transformer unitnot to output power to the drive part of the motor so as to achieve the safe shutdown requirement.

Description

technical field [0001] The invention relates to a motor system, in particular to a motor system capable of reducing common mode noise and achieving safe shutdown. Background technique [0002] Referring to FIG. 1 , it is a schematic diagram of a power supply of a known motor drive system. The alternating current (AC) power supply 40 can supply DC voltage to the power supply 44 of the insulated gate bipolar transistor (IGBT) driving frequency converter and the control part after being transformed by a transformer unit 42 (including a rectification part and a DC-DC conversion part). [0003] Specifically, referring to FIG. 2 , it is a block diagram for providing safety function operation in a known motor drive and control system. The provided DC voltage 44A is converted by the transformer unit 42 to supply power to a control section including a microcontroller 50 , an application specific integrated circuit (ASIC) 52 and an interface unit 54 . Furthermore, the transformer un...

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Problems solved by technology

[0004] However, in the circuit shown in Fig. 1 and Fig. 2, there are following problems: since the motor drive circuit uses a single transformer to supply power unit 58 and control chip (comprising the dotted line part of microcontroller 50, ASIC 52 and interface unit 54) auxiliary The power supply cannot effectively make the control chip obtain a clean feedback signal (feedback signal)

The stop signal 64 must be passed through the electromagnetic switch 62 to cut off the power to the motor 60 to meet the safety requirements, but the circuit is complicated

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