Low-voltage direct current motor
First Claim
Patent Images
1. A brush roller for a vacuum cleaner, the brush roller being driven by a low-voltage direct current motor, the low-voltage direct current motor comprising:
- a stator comprising a round housing, a permanent magnet mounted to an inner surface of the housing, and brushes; and
a rotor rotatable relative to the stator, the rotor comprising a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent to the rotor core, and rotor windings wound about poles of the rotor core and electrically connected to the commutator,wherein the brushes of the stator are disposed in sliding contact with the commutator, an input voltage of the motor is in the range of 7 to 36V, and a ratio of an outer diameter of the rotor core to an outer diameter of the housing is in the range of 67% to 75%, wherein the permanent magnet is a ferrite magnet made of a material with a maximum energy product BHmax of 35.8±
1.6 kj/m3, and wherein the outer diameter of the housing is 27.5 mm±
0.3 mm, and the outer diameter of the rotor core is 19 mm±
0.2 mm, and wherein when an axial length of the magnet is 21.0 mm±
2.1 mm, 27.5 mm±
0.3 mm, or 34 mm±
0.3 mm, the motor is capable of achieving a rated power output of 20 W, 50 W, or 80 W, respectively.
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0 Petitions
Accused Products
Abstract
A low-voltage direct current motor has a stator and a rotor rotatable relative to the stator. The rotor includes a rotary shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent to the rotor core, and rotor windings wound about poles of the rotor core and electrically connected to the commutator. The stator includes a round housing, a permanent magnet mounted to an inner surface of the housing, and brushes disposed in sliding contact with the commutator. An input voltage of the motor is in the range of 7 to 36V, and a ratio of an outer diameter of the rotor core to an outer diameter of the housing is in the range of 67% to 75%.
19 Citations
15 Claims
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1. A brush roller for a vacuum cleaner, the brush roller being driven by a low-voltage direct current motor, the low-voltage direct current motor comprising:
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a stator comprising a round housing, a permanent magnet mounted to an inner surface of the housing, and brushes; and a rotor rotatable relative to the stator, the rotor comprising a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent to the rotor core, and rotor windings wound about poles of the rotor core and electrically connected to the commutator, wherein the brushes of the stator are disposed in sliding contact with the commutator, an input voltage of the motor is in the range of 7 to 36V, and a ratio of an outer diameter of the rotor core to an outer diameter of the housing is in the range of 67% to 75%, wherein the permanent magnet is a ferrite magnet made of a material with a maximum energy product BHmax of 35.8±
1.6 kj/m3, and wherein the outer diameter of the housing is 27.5 mm±
0.3 mm, and the outer diameter of the rotor core is 19 mm±
0.2 mm, and wherein when an axial length of the magnet is 21.0 mm±
2.1 mm, 27.5 mm±
0.3 mm, or 34 mm±
0.3 mm, the motor is capable of achieving a rated power output of 20 W, 50 W, or 80 W, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A brush roller for a vacuum cleaner, the brush roller being driven by a low-voltage direct current motor, the low-voltage direct current motor comprising:
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a stator comprising a round housing, a permanent magnet mounted to an inner surface of the housing, and brushes; and a rotor rotatable relative to the stator, the rotor comprising a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent to the rotor core, and rotor windings wound about poles of the rotor core and electrically connected to the commutator, wherein the brushes of the stator are disposed in sliding contact with the commutator, an input voltage of the motor is in the range of 7 to 36V, and a ratio of an outer diameter of the rotor core to an outer diameter of the housing is in the range of 67% to 75%, wherein the permanent magnet is a ferrite magnet made of a material with a maximum energy product BHmax of 34.2±
1.6 kj/m3, and wherein the outer diameter of the housing is 27.5 mm±
0.3 mm, and the outer diameter of the rotor core is 19 mm±
0.2 mm, when an axial length of the magnet is 21.0 mm±
2.1 mm, 27.5 mm±
0.3 mm, or 34 mm±
0.3 mm, the motor is capable of achieving a rated power output of 20 W, 50 W, or 80 W, respectively. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A brush roller for a vacuum cleaner, the brush roller being driven by a low-voltage direct current motor, the low-voltage direct current motor comprising:
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a stator comprising a round housing, a permanent magnet mounted to an inner surface of the housing, and brushes; and a rotor rotatable relative to the stator, the rotor comprising a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent to the rotor core, and rotor windings wound about poles of the rotor core and electrically connected to the commutator, wherein the brushes of the stator are disposed in sliding contact with the commutator, an input voltage of the motor is in the range of 7 to 36V, and a ratio of an outer diameter of the rotor core to an outer diameter of the housing is in the range of 67% to 75%, and wherein the outer diameter of the housing is 27.5 mm±
0.3 mm, and the outer diameter of the rotor core is 19 mm±
0.2 mm, and wherein the rotor core has five or ten poles, the stator has two permanent magnetic poles, and the commutator has five commutator segments.
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Specification
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Current AssigneeJohnson Electric International AG (Johnson Electric Holdings Limited)
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Original AssigneeJohnson Electric International AG (Johnson Electric Holdings Limited)
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InventorsLu, Ming Cen, Law, Chi Keung, Leung, Ngai Ming
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Primary Examiner(s)Kim, John K
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Application NumberUS15/185,492Publication NumberTime in Patent Office984 DaysField of Search31015401US Class CurrentCPC Class CodesH02K 1/02 characterised by the magnet...H02K 1/17 Stator cores with permanent...H02K 2213/03 Machines characterised by n...H02K 23/04 having permanent magnet exc...
