Control motor integrated with a direct current motor and a speed control circuit
First Claim
1. A control motor comprising an integrated direct current motor and speed control circuit, said speed control circuit controlling a rotational speed of said direct current motor by means of changing a voltage applied to an armature of said motor by a chopping of a switching element, said speed control circuit being composed upon a printed circuit board which is supported in said direct current motor by a case member formed of a heat-conducting material, and a radiation portion of said switching element which is in close contact with a projection formed integrally with said case member and is installed in said projection.
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Accused Products
Abstract
A control motor comprising an integrated direct current motor and speed control circuit, the speed control circuit controlling a rotational speed of the direct current motor by means of changing a voltage applied to an armature by a chopping of a switching element, the speed control circuit being composed upon a printed circuit board, the printed circuit board being supported in the direct current motor by a case member formed of a heat-conducting material, and a radiation portion of the switching element which is closely contracted with a projection formed integrally with the case member and is installed in the projection.
145 Citations
7 Claims
- 1. A control motor comprising an integrated direct current motor and speed control circuit, said speed control circuit controlling a rotational speed of said direct current motor by means of changing a voltage applied to an armature of said motor by a chopping of a switching element, said speed control circuit being composed upon a printed circuit board which is supported in said direct current motor by a case member formed of a heat-conducting material, and a radiation portion of said switching element which is in close contact with a projection formed integrally with said case member and is installed in said projection.
Specification