ELECTRIC MOTOR AND MOTORIZED ROTARY JOINT

PROBLEM TO BE SOLVED: To provide an electric motor which can effectively radiate a switching element and can be reduced in size totally, including a power substrate, and to provide a motorized rotary joint. SOLUTION: The electric motor 4 has a front bracket 7, pivotably supporting a rotary shaft 5 a...

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Bibliographic Details
Main Authors OGIWARA SHIGERU, KASAI SHU, YAMAGISHI TOMOO, HARASHIMA ATSUSHI
Format Patent
LanguageEnglish
Published 10.09.2009
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
DYNAMO-ELECTRIC MACHINES
ELECTRICITY
GENERATION
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Summary:PROBLEM TO BE SOLVED: To provide an electric motor which can effectively radiate a switching element and can be reduced in size totally, including a power substrate, and to provide a motorized rotary joint. SOLUTION: The electric motor 4 has a front bracket 7, pivotably supporting a rotary shaft 5 and a rear bracket 8, wherein the power substrate 50 for switching conduction to each phase coil is arranged on the front bracket 7 side via a heat-dissipating sheet 46, while an encoder 40 for detecting the rotation angle of the rotary shaft 5 is arranged on the rear bracket 8 side; and the power substrate 50 is electrically connected to the encoder 40. The power substrate 50 includes the switching element 48, constituting a bridge circuit, wherein the heat dissipating sheet 46, is interposed between the switching element 48 and the front bracket 7, allowing the heat generated in the switching element 48 to be transferred to the front bracket 7 via the heat-dissipating sheet 46. COPYRIGHT: (C)2009,JPO&INPIT
Bibliography:Application Number: JP20080047769