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Method for detecting motor phase error on motor arrangement and drive circuit for driving electronically commutated motor

A technology of drive circuit and detection circuit, which is applied in the direction of measuring device, AC motor control, emergency protection circuit device, etc., can solve problems such as motor phase interruption, pose risk, insulation failure, etc., and achieve simple circuit structure and simple measurement signal evaluation Effect

Pending Publication Date: 2020-02-21
代傲阿扣基金两合公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

These insulation faults include insulation faults of the motor phases, which may arise, for example, from defects in the motor cables or motor windings
In addition, an insulation fault may occur at the neutral point of the motor due to insulation faults in the motor windings
In the event of an insulation fault, current may flow to earth or the protective conductor, in which case this fault current may pose a risk to persons due to the risk of electric shock and fire
Furthermore, interruptions of motor phases can occur in motor installations, for example due to cut motor cables or burnt motor windings

Method used

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  • Method for detecting motor phase error on motor arrangement and drive circuit for driving electronically commutated motor
  • Method for detecting motor phase error on motor arrangement and drive circuit for driving electronically commutated motor
  • Method for detecting motor phase error on motor arrangement and drive circuit for driving electronically commutated motor

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Embodiment Construction

[0042] refer to Figure 1 to Figure 3 , to explain the structure and operation method of the driving circuit for an electronically commutated motor according to the first exemplary embodiment in more detail.

[0043] The drive circuit 10 is used to drive an electronically commutated motor 12 . exist figure 1 In the exemplary embodiment of the motor, the motor is a three-phase brushless motor 12 having three motor phases U, V, W interconnected at a neutral point SP. The electric machine 12 is fed from a DC voltage intermediate circuit 14 via an inverter 16 . The DC voltage intermediate circuit 14 has an intermediate circuit capacitor C1 and the inverter 16 has in this exemplary embodiment a three-phase inverter bridge circuit with a total of six Circuit breakers M1 to M6 (eg MOSFETs or IGBTs with anti-parallel connected diodes). The three motor windings of the motor 12 are connected by motor cables 18 to a motor phase connection 20 which is connected to the three center tap...

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Abstract

In a method for detecting a motor phase fault (R7a...d; X) of a motor arrangement (12, 18), the motor phases (U, V, W) of which are connected to a drive circuit (10) having a DC voltage intermediate circuit (14) and an inverter (16). A motor phase voltage (Uu, Uv, Uw) at at least one of the motor phases (U, V, W) with respect to a reference potential (P1) is captured while the inverter (16) is switched off; and a voltage profile of the captured motor phase voltage (Uu, Uv, Uw) is used to determine whether there is a motor phase fault (R7a...d; X) on one of the motor phases (U, V, W) of the motor arrangement (12, 18).

Description

technical field [0001] The invention relates to a method for detecting a motor phase failure of an electric motor arrangement, a method for operating a drive circuit for driving an electronically commutated motor with such a motor phase detection, and a method for driving an electronically commutated motor drive circuit. Background technique [0002] When operating electronically commutated motors with drive circuits, various insulation faults can occur on the motor side. These insulation faults include insulation faults of the motor phases, which may arise, for example, due to defects in the motor cables or in the motor windings. In addition, an insulation failure may occur at the neutral point of the motor due to insulation failure of the motor windings. In the event of an insulation fault, current may flow to earth or the protective conductor, in which case this fault current may pose a risk to people due to the risk of electric shock and fire. In addition, interruptio...

Claims

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Application Information

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IPC IPC(8): H02H7/09G01R31/34
CPCH02H7/09G01R31/343H02H7/08H02H11/005G01R31/34H02P23/26H02P29/0243H02P27/06H02P2201/15
Inventor M·魏因曼A·施密德S·蒂纽斯
Owner 代傲阿扣基金两合公司
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