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Motor drive

A motor driver and main relay technology, applied in motor control, AC motor control, elevators, etc., can solve expensive and other problems

Active Publication Date: 2018-04-03
KONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So for this it is necessary to provide a high current contactor between the inverter bridge and the lift motor, but this is expensive

Method used

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Examples

Experimental program
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Embodiment Construction

[0029] figure 1 Shown is a motor drive 10 comprising a rectifier bridge 12 connected to a power source L1, L2, L3 via a main relay 14 having contacts for power phases (e.g. public alternating current (AC) grid) L1-L3 Switches 16a-16c. A charging relay 18 having charging switches 20a-20c is connected in parallel with the main relay 14, wherein each charging switch 20a-20c forms a charging circuit 24 together with a PTC resistor 22 as a current limiting element in each phase L1-L3.

[0030] To prevent fault signals of the AC network from damaging the rectifier bridge 12, the rectifier bridge 12 is connected to the power supply via a smoothing circuit 11 comprising capacitors and / or coils.

[0031] The rectifier bridge 12 is connected to the inverter bridge 26 via an intermediate DC circuit 28 having a positive branch 30 and a negative branch 32 with a capacitor 34 or battery connected between them. The inverter bridge 26 is connected to the elevator motor 36 without placing a...

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PUM

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Abstract

The invention relates to a motor drive (10) comprising a rectifier bridge (12) for connection with mains, a converter bridge (26) configured to be connected with an elevator motor and an intermediateDC circuit (28) in-between, whereby between a positive and a negative branch (30, 32) of the intermediate DC circuit (28) at least one capacitor (34) and / or battery is connected, whereby at the mainsside of the rectifier bridge (12) a controlled main relay (14) with contacts (16a, 16b, 16c) is arranged, which are configured to connect or disconnect the rectifier bridge (12) with the correspondingmains phase (L1, L2, L3), characterized in that the motor drive (10) comprises a charging circuit (24) being connected between the mains and the rectifier bridge (12) and / or intermediate DC circuit (28), which charging circuit comprises at least one charging switch (20) connected in series with at least one current limiting component (22, 42).

Description

technical field [0001] The present invention relates to a motor drive which enables an economical way to implement earth fault protection of a motor. Background technique [0002] A motor ground fault occurs if one or more motor outputs are grounded. Such ground faults should be detected to prevent excessive current from flowing and damaging any components of the motor drive. The chances of a ground fault occurring during operation of the motor drive are fairly low, but are very likely to occur during installation when the power is cut off. Therefore, in most cases, it is sufficient to detect a ground fault situation when the mains supply is connected, and then prevent the flow of ground fault current by using some switching elements. of this application figure 2 An internally known solution for preventing the flow of earth fault currents in this case is shown. In known solutions, the motor driver comprises a rectifier bridge, ie an active semiconductor bridge or a passi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/024H02P29/028
CPCH02P29/032H02P29/027H02H7/09H02H7/1216H02H7/0833B66B5/0031B66B1/30H02M5/4585H02H1/0007H02P27/06B66B9/00B66B11/043
Inventor P.拉西纳J.尼坎德P.林内萨里A-P.拉赫蒂宁A.纳卡里O.波基宁
Owner KONE CORP