NORMALLY-OFF PROTECTION ELEMENT AND CONTROL UNIT PROVIDED WITH SAME

WIPO Patent Application WO/2010/038339

A1

A first terminal of a protection element of a control unit is connected to a line between a motor and a switching element, and a second terminal thereof is directly connected to a ground-side line that is common to a controller and the switching element.  The protection element is provided therein with a normally-off switch consisting of a movable contact and a fixed contact.  When overheating caused by the switching element reaches or exceeds a predetermined temperature, the movable contact and the fixed contact are closed to cause the first terminal and the second terminal to be short-circuited to divert an electric current to the protection element side, thereby reducing an electric current flowing to the switching element and shifting the control unit to a temperature range that is safe from the overheating caused by the switching element without stopping a cooling system.

JP2010136611	DIRECT CURRENT MOTOR CONTROL DEVICE AND METHOD OF THE SAME
JPS5893401	CONTROLLER FOR ELECTRIC ROLLING STOCK
JPS5815247	[Title of the Invention] A motor control method of a shearing machine between Running

TAKEDA HIDEAKI (JP)

PCT/JP2009/003214

April 08, 2010

July 09, 2009

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UCHIYA THERMOSTAT (JP)
TAKEDA HIDEAKI (JP)

H02P7/06; H02P7/29; F01P7/04; H01H37/54; H01H37/76; H02H5/04; H02H7/085

JP2006158145A	2006-06-15
JPS59185938U	1984-12-10
JP2007028736A	2007-02-01
JP2003199247A	2003-07-11
JPS54124974U	1979-08-31

OSUGA, Yoshiyuki (JP)
Yoshiyuki Osuge (JP)

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