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US 8,710,707 B2Granted
Electric motor
AssigneeJohnson Electric S.A.
InventorsJames Ching Sik Lau, Xiao Jun Yang, Kwong Yip Poon
Life of this patent
Estimating the term…
Abstract
An electric motor includes a stator and a rotor rotatably installed in the stator. The stator includes a pair of end caps disposed at opposite ends thereof, and a pair of bearings respectively fixed to outer surfaces of the end caps from outside thereof. The rotor includes a shaft pivotally supported by the bearings.
Claims14
An electric motor comprising:
- a stator core having first and second ends;
- first and second end caps fixed with respect to the stator core, each end cap defining a stepped hole having a large section near an outer surface of the end cap and a small section near an inner surface of the end cap;
- first and second ball bearings respectively fixed to the end caps;
- and
- a rotor installed in the stator, the rotor comprising a shaft rotatably supported by the first and second ball bearings,
- wherein the first and second ball bearings are fixed to the large sections of corresponding stepped holes from outside of the end caps and cooperate with the shaft to axially clamp the end caps with respect to the stator core,
- wherein the motor is connected to a gearbox which has a casing, the casing having a through hole through which the shaft extends, and
- wherein the first ball bearing has one end being fixedly received in the large section of the stepped hole of the first end cap and an other end extending outwardly beyond an outer surface of the first end cap to be fixedly received in the through hole of the casing of the gearbox, to thereby axially align the first end cap and the casing with the shaft.
5 more elements
An electric motor comprising:
- a stator core having first and second ends;
- first and second end caps fixed with respect to the stator core;
- first and second bearings respectively fixed to the end caps;
- and
- a rotor installed in the stator, the rotor comprising a shaft rotatably supported by the bearings,
- wherein the bearings are fixed to the end caps from outside of the end caps and the bearings clamp the end caps to the stator core,
- wherein each end cap defines a stepped hole which comprises a large section near an outer surface of the end cap and a small section near an inner surface of the end cap, the shaft of the rotor extending through the large section and the small section which are coaxial with the shaft, each bearing being received in the large section of the corresponding stepped hole,
- wherein the stator core comprises a yoke and a plurality of teeth extending inwardly from the yoke, each tooth has a pole shoe which confronts the rotor, the motor further comprises windings wound about repective teeth of the stator core and a plurality of locking members engaging the stator core and the end caps to space the end caps from the stator core, and
- wherein the locking members are elongate pins with grooves in opposite sides thereof and extend through gaps between the pole shoes of adjacent teeth, circumferential edges of the pole shoes being received in corresponding grooves of the locking members.
6 more elements
An electric motor comprising:
- a stator core;
- first and second end caps fixed with respect to the stator core, each of the first and second end caps defining a hole;
- first and second ball bearings respectively received in the holes of the end caps;
- a rotor installed in the stator, the rotor comprising a shaft rotatably supported by the bearings, and
- a gearbox having a casing fixed to the outer surface of the first end cap,
- wherein an end of the first bearing extends outwardly beyond an outer surface of the first end cap and is fixedly received in a through hole of the casing to align the casing with the shaft, the first bearing having an opposite end received in the hole of the first end cap to align the first end cap with the shaft.
3 more elements
Dependencies are inferred from the claim text.