DC Brushless electromagnetic rotary machine
First Claim
1. A dc electromagnetic rotary machine comprising:
- permanent magnet means for producing magnetic flux, said permanent magnet means having a generally circular hollow shape which has outer and inner cylindrical surface portions, said outer cylindrical surface portion being magnetized in one magnetic polarity and the inner cylindrical surface portion being magnetized in the other magnetic polarity opposite to the one polarity;
rotor shaft means for fixedly carrying said permanent magnet means thereon;
casing means including a magnetically permeable substance for rotatably supporting said rotor shaft means;
armature core means fixedly supported by said casing means so as to face substantially the one surface portion of said permanent magnet means for permeating the magnetic flux therethrough;
coil means supported by said armature core means for conducting current therethrough, a portion of said coil means being positioned in a gap formed between said armature core means and said permanent magnet means; and
magnetic-path forming means extending from said casing means toward said rotor shaft means for bridging the magnetic flux between said casing means and said permanent magnet means;
whereby the current flowing over said coil means causes the magnetic flux emanating from said permanent magnet means to be turned partially.
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Accused Products
Abstract
A dc brushless electromagnetic rotary machine, such as a dc electric motor, a dc electrical generator, includes a rotor having a permanent magnet which is cylindrical outer peripheral surface magnetized in the same polarity. The outer surface faces armature cores fixed on the inner cylindrical surface of a casing frame forming a stator of the machine. In the structure, the magnetic flux emanating from the rotor magnet passes the armature cores and returns to the magnet from a position other than the armature cores. The armature core is provided with coil windings wound thereon in such a manner that a portion of the windings is included in the air gap formed between the rotor magnet and the cores. Additional magnetic flux induced in response to current flowing over the armature windings causes the main magnetic flux generated from the rotor magnet to be turned in the same way irrespective of the angular position of the rotor. Consequently, continuous rotation of the rotor will be accomplished in the case of dc motors, and continuous generation of dc power will be achieved in the case of dc generators.
51 Citations
17 Claims
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1. A dc electromagnetic rotary machine comprising:
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permanent magnet means for producing magnetic flux, said permanent magnet means having a generally circular hollow shape which has outer and inner cylindrical surface portions, said outer cylindrical surface portion being magnetized in one magnetic polarity and the inner cylindrical surface portion being magnetized in the other magnetic polarity opposite to the one polarity; rotor shaft means for fixedly carrying said permanent magnet means thereon; casing means including a magnetically permeable substance for rotatably supporting said rotor shaft means; armature core means fixedly supported by said casing means so as to face substantially the one surface portion of said permanent magnet means for permeating the magnetic flux therethrough; coil means supported by said armature core means for conducting current therethrough, a portion of said coil means being positioned in a gap formed between said armature core means and said permanent magnet means; and magnetic-path forming means extending from said casing means toward said rotor shaft means for bridging the magnetic flux between said casing means and said permanent magnet means; whereby the current flowing over said coil means causes the magnetic flux emanating from said permanent magnet means to be turned partially. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification