Johnson Electric S.a.

Biao Yu

Ben To Fan Wong

Tian Jun Liao

Hong Wei Zhang

Tain Jun Liao

An electric motor includes a stator, a rotor and an end cap. The stator includes a housing and magnets attached to an inner surface of the housing. The housing has an open end closed by the end cap. The rotor includes a shaft, an armature and a commutator fixed to the shaft. The end cap includes a cover case, a support plate integrally formed in the cover case, brushes, a bearing and a printed circuit board mounted in the cover case. The support plate divides the interior space of the cover case into a first cavity and a second cavity. The brushes are mounted in the first cavity, the bearing is mounted on the support plate, and the printed circuit board is mounted in the second cavity.

Electric motor

A motor comprises a stator and a rotor () disposed within the stator. The stator comprises: a housing () having a polygon cross section that comprises a plurality of side portions (-) and a plurality of curved corner portions (-), each of the corner portions connect two adjacent side portions and curve around a center (O') which is offset from the rotational center (O) of the rotor; and a ring magnet () fixed to the inner surface of the housing. An air gap () is formed between a peripheral surface of the rotor () and an inner surface of the ring magnet (). The thickness of the ring magnet at portions corresponding to the corner portions (-) of the housing being larger than the thickness of the ring magnet at portions corresponding to the side portions (-) of the housing.

Permanent magnet electric motor

A motor comprises a stator and a rotor () disposed within the stator. The stator comprises a shell comprising a plurality of sidewalls (-) and arcuate connection parts (-) connecting neighboring sidewalls. The cross section of the shell is a polygon with fillets. The stator also comprises a plurality of magnets (-) installed inside the arcuate connection parts. The magnets (-) are mutual arranged at intervals. The outer surface of each magnet (-) is attached to inner surfaces of the two neighboring sidewalls (-) and a gap is formed between the magnet and the inner surface of the corresponding arcuate connection part. Air gaps are formed between the inner surface of the magnets (-) and the outer surface of the rotor. Disposing the magnets inside the arcuate connection parts improves the space utilization ratio. In addition, the gaps formed between the outer surface of magnets and the inner surface of arcuate connection parts may be used for adhesive to fix the magnets to the shell.

Motor

An electric motor has a rotor (), a housing () and a ring magnet () fixed onto an inner surface of the housing. The housing () has a cross section in a polygon, preferably tetragonal, shape that comprises a plurality of side portions () and a plurality of curved corner portions (), each of which connects two adjacent side portions. The thickness of the ring magnet at portions corresponding to the corner portions of the housing is larger than the thickness of the ring magnet at portions corresponding to the side portions of the housing. An air gap () is formed between a peripheral surface of the rotor and an inner surface of the ring magnet, the thickness of the air gap at portions corresponding to the corner portions of the housing being smaller than that of the air gap at portions corresponding to the side portions of the housing. The motor has a polygon housing which is convenient to install and has good space utilization.

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Shenzhen, China

Biao Yu