US 2014/0197769 A1Published application

Over temperature protection device for electric motors

AssigneeMitsubishi Electric Corporation

InventorsTomohiro Kojiya, Yuruki Okada

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Abstract

An over temperature protection device for electric motors applicable to a railway vehicle driving system that operates a plurality of electric motors in parallel using one or a plurality of inverter devices includes a control device configured to control the operation of an inverter device and a protecting device configured to detect, on the basis of a frequency fs including frequency information at the time when the inverter device is applying control for fixing a ratio of a voltage and a frequency to electric motors and electric currents of at least one phase flowing to the electronic motors, an over temperature that could occur in the electric motors, to generate an over temperature protection signal Tf for protecting the electric motors from the over temperature, and to output the over temperature protection signal Tf to the control device.

Claims5

Dependent claims

a control device configured to control an operation of the inverter device;
and
a protecting device configured to detect, based on information concerning the frequency at the time when the inverter device is applying control for fixing the ratio of a voltage and a frequency to the electric motors and an electric current a current detection value of at least one phase flowing to the electronic motors and output, on the basis of a result of determination as to whether the information concerning the frequency is lower than a specified value and a result of determination as to whether a differential current between electric current detection values flowing to predetermined two electric motors among the electric motors is larger than a specified value, to generate an over temperature protection signal for protecting the electric motors from the over temperature, and to output the over temperature protection signal to the control device.

Dependencies are inferred from the claim text.

Facts

Application: 14/343,492Filed 8 Sep 2011
Published: 17 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H02P 29/64
Controlling or determining the temperature of the motor or of the drive: controlling or determining the temperature of the winding
B60L 3/0061
Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train: relating to electrical machines
H02P 5/50
For speed regulation of two or more dynamo-electric motors in relation to one another: by comparing electrical values representing the speeds
H02P 27/047
Using variable-frequency supply voltage, e.g. inverter or converter supply voltage: v/F converter, wherein the voltage is controlled…

Family

US 9,479,107 B2Related patent
US 2014/0197769 A1This patent

From the US filing history. Foreign family members aren’t listed.

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