DC COMMUTATOR MOTOR AND AUTOMOBILE INCLUDING THE SAME

• US 20130264904A1
• Filed: 04/05/2013
• Published: 10/10/2013
• Est. Priority Date: 04/10/2012
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: TANIGUCHI, Tsukasa, IWAKI, Hidefumi
• Granted Patent: US 9,583,985 B2
• Time in Patent Office: Days
• US Class Current: 310/198
• CPC Class Codes: H02K 23/36 having two or more windings; having two or more commutators; having two or more stators
• CPC Class Codes: H02K 23/38 having winding or connection for improving commutation, e.g. equipotential connection
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32

Abstract

A DC commutator motor includes a yoke, a field magnet, and an armature. A shaft is positioned on a central axis of the armature. A plurality of commutator segments is positioned in a circumferential direction of the shaft. A plurality of armature slots is formed on an outer periphery of an armature core. An upper coil is wound the number of turns Na through two armature slots, which are located apart from each other with the predetermined number of armature slots therebetween, at their opening sides. A lower coil is connected in parallel with the upper coil and wound the number of turns Nb through the two armature slots at their bottom sides. The number of turns Na is smaller than the number of turns Nb.

Claims

1. A DC commutator motor comprising:

a yoke;

a field magnet positioned at an inner peripheral side of the yoke;

an armature rotatably supported at an inner peripheral side of the field magnet with a gap therebetween;

a shaft positioned on a central axis of the armature;

a plurality of commutator segments positioned in a circumferential direction of the shaft;

a plurality of armature slots positioned on an outer periphery of the armature;

an upper coil wound the number of turns Na through two of the armature slots at an opening side of each of the two slots, the two of the armature slots being located apart from each other with the predetermined number of armature slots therebetween; and

a lower coil connected in parallel with the upper coil, the lower coil being wound the number of turns Nb through the two of the armature slots at a bottom side of each of the two slots,

wherein the number of turns Na is smaller than the number of turns Nb.

2. The DC commutator motor according to claim 1, wherein

the number of turns Na of the upper coil and the number of turns Nb of the lower coil are set such that

a difference between a resistance value of the upper coil and a resistance value of the lower coil is a minimum.

3. The DC commutator motor according to claim 2, wherein

the number of turns Na of the upper coil and the number of turns Nb of the lower coil are set such that

the resistance value of the upper coil is identical to the resistance value of the lower coil.

4. The DC commutator motor according to claim 2, wherein

an end point of winding of an i-th (where i=1 to N) upper coil is connected to a start point of the winding of an (i+1)th upper coil, and

an end point of the winding of an i-th (where i=1 to N) lower coil is connected to a start point of the winding of an (i+1) lower coil.

5. The DC commutator motor according to claim 4, wherein

the upper coil is constituted by a first continuous winding conductor, and

the lower coil is constituted by a second continuous winding conductor.

6. The DC commutator motor according to claim 5, wherein

each of the plurality of commutator segments comprises a hook portion, the hook portion comprising a conductive member in a hook shape,

the end point of the winding of the i-th upper coil is hooked to the hook portion of one of the commutator segments to become the start point of the winding of the (i+1)th upper coil, the one of the commutator segments connecting the i-th upper coil and the (i+1)th upper coil, and

the end point of the winding of the i-th lower coil is hooked to the hook portion of one of the commutator segments to become the start point of the winding of the (i+1)th lower coil, the one of the commutator segments connecting the i-th lower coil and the (i+1)th lower coil.

7. The DC commutator motor according to claim 6, wherein

the first winding conductor and the second winding conductor are constituted by one continuous winding conductor.

8. The DC commutator motor according to claim 7, wherein

an external diameter of the armature is larger than an axial dimension of the armature.

9. An automobile comprising

an auxiliary machine for use in the automobile, the auxiliary machine being a peripheral device for operating an engine,

the auxiliary machine comprising a DC commutator motor,

wherein the DC commutator motor comprises:

a yoke;

a field magnet positioned at an inner peripheral side of the yoke;

an armature rotatably supported at an inner peripheral side of the field magnet with a gap therebetween;

a shaft positioned on a central axis of the armature;

a plurality of commutator segments positioned in a circumferential direction of the shaft;

a plurality of armature slots positioned on an outer periphery of the armature;

an upper coil wound the number of turns Na through two of the armature slots at an opening side of each of the two slots, the two of the armature slots being located apart from each other with the predetermined number of armature slots therebetween; and

a lower coil connected in parallel with the upper coil, the lower coil being wound the number of turns Nb through the two of the armature slots at a bottom side of each of the two slots,

wherein the number of turns Na is smaller than the number of turns Nb.