Motor driving assembly

Patent metadata

Field	Value
Publication number	US-10693351-B2
Application number	US-201615361202-A
Country	US
Kind code	B2
Filing date	Nov 25, 2016
Priority date	Nov 25, 2015
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A motor driving assembly includes a motor. The motor includes an outer housing, and a rotor and a brush holder received in the outer housing. The rotor includes a rotary shaft extending out of the outer housing. A commutator is fixed on a shaft portion of the rotary shaft within the outer housing. Brushes for contacting the commutator are disposed on the brush holder. A visible identification mark fixed relative to the rotary shaft is disposed outside the outer housing of the motor, such that a relative position between the brushes and the commutator in a rotational direction of the rotary shaft is identifiable by reference to a position of the visible identification mark relative to the outer housing in the rotational direction of the rotary shaft. As such, the commutator can be prevented from stalling at a position where arcing noise may be easily generated.

First claim

The invention claimed is:

1. A motor driving assembly comprising a motor, the motor comprising:
an outer housing,
a rotor received in the outer housing, the rotor comprising a rotary shaft extending out of the outer housing, a commutator being fixed on a shaft portion of the rotary shaft within the outer housing; and
a brush holder received in the outer housing with brushes for contacting the commutator disposed on the brush holder, and
wherein a visible identification mark fixed relative to the rotary shaft is disposed outside the outer housing of the motor, such that a relative position between the brushes and the commutator in a rotational direction of the rotary shaft is identifiable by reference to a position of the visible identification mark relative to the outer housing in the rotational direction of the rotary shaft;
wherein the motor driving assembly further comprises a worm which is fixedly connected to the shaft portion of the rotary shaft outside the housing for rotation with the rotary shaft, the worm is configured to drivingly connect to a worm gear, and the visible identification mark is disposed on the worm.

2. The motor driving assembly of claim 1 , wherein the visible identification mark is disposed on the rotary shaft outside the outer housing.

3. The motor driving assembly of claim 2 , wherein the visible identification mark is an optical reflection mark, a color mark, or a plane disposed on an outer circumferential surface of the rotary shaft.

4. The motor driving assembly of claim 2 , wherein the visible identification mark is disposed on one end of the rotary shaft away from the outer housing.

5. The motor driving assembly of claim 1 , wherein a fixing block is fixed on the rotary shaft, the worm includes a thread portion and a fixing ring at one end of the thread portion, the fixing ring is attached around the fixing block and is directly fixed relative to the fixing block in the rotational direction of the rotary shaft, and the visible identification mark is disposed on the fixing ring.

6. The motor driving assembly of claim 5 , wherein the visible identification mark is an optical reflection mark, a color mark, or a plane disposed on an outer circumferential surface of the fixing ring.

7. The motor driving assembly of claim 1 , wherein the visible identification mark is disposed on one end of the worm away from the outer housing.

Assignees

• Johnson Electric Sa
• Johnson Electric Int Ag

Inventors

• Lau James Ching Sik
• Wong Duncan Yiu Lung
• Cheung Chun Kit

Classifications

• H02K11/20

  for measuring, monitoring, testing, protecting or switching (rectifiers H02K11/04; power electronics H02K11/33) · CPC title

• H02K1/2786

  Outer rotors · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K7/1166 Primary

  comprising worm and worm-wheel (structural association with bearings specially adapted for worm gear drives H02K7/081) · CPC title

• H02K13/006 Primary

  Structural associations of commutators · CPC title