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Circuits for thermal protection and power regulation of motors

A technology of power regulation and thermal protection, which is applied to emergency protection circuit devices, emergency protection circuit devices, and circuit devices for limiting overcurrent/overvoltage, and can solve the problems of increasing circuit costs and component costs

Active Publication Date: 2018-11-09
EBM PAPST MULFINGEN GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will increase the circuit cost and component cost

Method used

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  • Circuits for thermal protection and power regulation of motors

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Embodiment Construction

[0009] Although some of the features mentioned and / or known from the drawings of a circuit or its components according to the invention may only be relevant to the description of one or more other features, according to the invention these features are not Depending on the embodiment, the features, either individually or in combination with other features in the embodiment, are significant and therefore need to be treated as inventions.

[0010] figure 1 Shown is a wiring diagram of a motor with three motor windings W1, W2 and W3, which are connected to the power supply via wire L1 to wire L3. Here, the electric machine is operated in a star circuit by way of example.

[0011] Arranged for the windings are temperature monitors TW1 and TW2 as well as temperature-sensitive resistors PTC, which are connected in series with one another in no particular order. Temperature sensitive resistor PTC especially PTC resistor.

[0012] The end of this series circuit is connected to the ...

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Abstract

The invention relates to a circuit for thermal protection and power regulation based on the actual winding temperature of a phase winding of an electric motor. The circuit comprises at least one temperature monitor switch TW1, TW2 for measuring the winding temperature of the phase winding and a temperature sensitive resistor PTC arranged for the phase winding, the temperature monitor switch TW1, TW2 can The winding current flowing through the winding is cut off, and when the predetermined winding temperature is reached, the temperature-sensitive resistor PTC can reduce the power of the motor or cut off the power of the motor by realizing an increase in resistance. One of the phase windings has a temperature sensitive resistor PTC. The other phase winding or other phase windings each have a temperature monitor switch TW1 , TW2 . The temperature-sensitive resistor PTC and the temperature monitor switches TW1 and TW2 are connected in series on the power supply.

Description

technical field [0001] The invention relates to a circuit for thermal protection and power regulation depending on the actual winding temperature of a phase winding of an electrical machine, with a temperature monitor switch for measuring the winding temperature of said phase winding and a temperature sensitive switch arranged for said phase winding Resistor, when the predetermined winding temperature is reached, that is, the switch temperature (Schalttemperatur), the temperature monitor switch will cut off the winding current flowing through the winding, and when the predetermined winding temperature is reached, the temperature sensitive resistor will increase the resistance by realizing And the power of the motor is reduced. Background technique [0002] As is known, the protection of three-phase motors against thermal overload is achieved by means of three temperature monitor switches, which are preferably bimetallic switches. The temperature of each motor phase is detec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08H02P29/64
CPCH02H5/04H02H7/0852H02H9/026H02P29/02H02P29/64H02K23/36H02P3/06
Inventor 托马斯·萨澳
Owner EBM PAPST MULFINGEN GMBH & CO KG