Contact-commutated electric motor

Patent metadata

Field	Value
Publication number	US-2016190756-A1
Application number	US-201314423646-A
Country	US
Kind code	A1
Filing date	Aug 14, 2013
Priority date	Aug 31, 2012
Publication date	Jun 30, 2016
Grant date	—

Abstract

An electric motor with contact commutation may include an external stator and an internal, rotatably mounted rotor. A magnet arrangement including at least one permanent magnet may be arranged fixedly on the rotor. A coil arrangement including at least one electric coil may be arranged fixedly on the stator. A contact commutation assembly may be in communication with the coil arrangement.

First claim

1 . An electric motor with contact commutation, comprising: an external stator and an internal, rotatably mounted rotor, a magnet arrangement including at least one permanent magnet arranged fixedly on the rotor, a coil arrangement including at least one electric coil is arranged fixedly on the stator; and
a contact commutation assembly in communication with the coil arrangement.

2 . The electric motor according to claim 1 , wherein the contact commutation assembly includes a contact element arrangement, which is driven rotatably by the rotor and includes at least one contact element, and a slip ring arrangement, which is arranged in a rotationally fixed relative to the stator, the slip ring arrangement being electrically connected to the coil arrangement and including at least one slip ring.

3 . The electric motor according to claim 2 , wherein the slip ring arrangement includes a plurality of slip rings, wherein at least two slip rings of the plurality of slip rings define a slip ring group, wherein the respective slip ring group includes at least two slip rings electrically connected to one another via the at least one contact element.

4 . The electric motor according to claim 3 , wherein:
the respective slip ring group has two slip rings, the two slip rings defining a slip ring pair, the respective slip ring pair includes a first slip ring and a second slip ring, in that the first slip ring being electrically connected to at least one of the coil arrangement and a coil strand associated with the coil arrangement, and the second slip ring being segmented in a circumferential direction and including (i) at least one plus-pole segment, the at least one plus-pole segment electrically connected to a plus-pole terminal, the plus-pole terminal being connected to a plus pole of a power supply; (ii) at least one minus-pole segment electrically connected to a minus-pole terminal, the minus-pole terminal connected to a minus pole of the power supply; and (iii) at least two insulator segments, the at least two insulator segments being arranged in each case between the at least one plus-pole segment and the at least one minus-pole segment in the circumferential direction.

5 . The electric motor according to claim 4 , wherein:
a magnetic north pole and a magnetic south pole respectively define a magnetic pole pair within the magnet arrangement, and the number of plus-pole segments and the number of minus-pole segments is equal to the number of magnetic pole pairs.

6 . The electric motor according to claim 3 , wherein:
the respective slip ring group has three slip rings, a first slip ring electrically connected to a plus-pole terminal, the plus-pole terminal connected to a plus pole of a power supply, a second slip ring electrically connected to a minus-pole terminal, the minus-pole terminal connected to a minus pole of the power supply, and a third slip ring segmented in a circumferential direction and includes a plurality of insulator segments and a plurality of coil segments, wherein the plurality of insulator segments and the plurality of coil segments are electrically connected to the coil arrangement and alternate in the circumferential direction, wherein at least one contact element electrically connects the first slip ring to the third slip ring, and at least one other contact element electrically connects the second slip ring to the third slip ring.

7 . The electric motor according to claim 6 , wherein the slip ring arrangement has one slip ring group with three slip rings, wherein the plurality of coil segments are associated with a plurality of at least one of coils and coil strands.

8 . The electric motor according to claim 2 , wherein the slip ring arrangement has one slip ring, the slip ring being segmented in a circumferential direction and including (i) at least one plus-pole segment electrically connected to a plus-pole terminal, the plus-pole terminal connected to a plus pole of a power supply; (ii) at least one minus-pole segment electrically connected to a minus-pole terminal, the minus-pole terminal connected to a minus pole of the power supply; (iii) at least one coil segment electrically connected to the coil arrangement; and (iv) at least one electrically insulating insulator segment; wherein the at least one plus-pole segment, the at least one minus-pole segment, the at least one coil segment and the at least one insulator segment follow one another in the circumferential direction such that the coil segment is arranged between the plus-pole segment and the minus-pole segment, and the insulator segment is arranged between the plus-pole segment and the minus-pole segment.

9 . The electric motor according to claim 8 ,
wherein the coil arrangement includes a plurality of windings, the plurality of windings respectively defining a coil strand composed of at least one of a single coil and a plurality of coils connected in series, wherein the coil arrangement has a plurality of coil strands, the slip ring including a plurality of coil segments, wherein each coil segment is electrically connected to one of the plurality of coil strands, and each coil strand is electrically connected to at least one coil segment.

10 . The electric motor according to claim 2 ,
wherein the coil arrangement, includes a plurality of windings, the plurality of windings respectively defining at least one coil strand composed of at least one of a single coil and a plurality of coils connected in series, the coil arrangement has a plurality of coil strands, wherein the slip ring arrangement includes two slip rings, a first slip ring segmented in a circumferential direction defining a plurality of plus-pole segments, the plurality of plus-pole segments electrically connected to a plus-pole terminal, the plus-pole terminal connected to a plus pole of a power supply, and each of the plurality of coil strands has at least one coil segment, which is electrically connected to the respective coil strand, wherein the plurality of plus-pole segments and the plurality of coil segments are electrically insulated with respect to one another in the circumferential direction, and a second slip ring is segmented in the circumferential direction defining a plurality of minus-pole segments, the plurality of minus-pole segments electrically connected to a minus-pole terminal, which is connected to a minus pole of the power supply, and each of the plurality of coil strands has at least one coil segment, which is electrically connected to the respective coil strand, wherein the plurality of minus-pole segments and the plurality of coil segments are electrically insulated with respect to one another in the circumferential direction.

11 . The electric motor according to claim 10 , wherein:
the plurality of plus-pole segments and the plurality of coil segments of the first slip ring follow one another in the circumferential direction such that at least one coil segment is arranged between two plus-pole segments, and plurality of minus-pole segments and the plurality of coil segments of the second slip ring follow one another in the circumferential direction such that at least one coil segment is arranged between two minus-pole segments.

12 . The electric motor according to claim 10 , wherein:
the first slip ring further includes an electrically insulating insulator segment for each coil segment, wherein the plurality of plus-pole segments, the plurality of insulator segments and the plurality of coil segments following one another in the circumferential direction such that each coil segment adjoins one of the plurality insulator segments on one side and one of the plurality of plus-pole

Assignees

• Mahle Int Gmbh

Inventors

• Froebel Marcel
• Helmis Martin
• Mack Bernd
• Wieske Peter

Classifications

• H01R39/18 Primary

  Contacts for co-operation with commutator or slip-ring, e.g. contact brush · CPC title

• H02K23/62 Primary

  Motors or generators with stationary armatures and rotating excitation field · CPC title

• H02K13/003

  Structural associations of slip-rings · CPC title

• H02K13/006

  Structural associations of commutators · CPC title