Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-07-19
1997-07-22
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 56, 310 89, 310 90, 310 905, H02K 708, H02K 1514
Patent
active
056506740
ABSTRACT:
An enclosed electric motor includes a stator assembly, a rotor assembly held via a dynamic pressure air bearing on the stator assembly, and a motor casing enclosing the stator and rotor assemblies. An air flow path is formed in the motor casing so as to communicate between an axial upper space and an axial lower space in the motor casing, so that the difference in air pressure between these spaces is reduced. Heat-dissipating fins are formed on the outer periphery of the motor casing so as to correspond to the air flow path. When the motor casing is formed with a plurality of air flow paths, a circumferential interval of the air flow paths is set at 150 degrees. A circumferential interval of two concavities formed in the inner periphery of the motor casing is also set at 150 degrees. Either one of the concavities serves as a window through which laser beams pass when the motor is used as a scanner motor for driving a polygon mirror which is employed for scanning laser beams in a laser printer.
REFERENCES:
patent: 2488387 (1949-03-01), Elsay
patent: 4644202 (1987-02-01), Kroy et al.
patent: 5434695 (1995-07-01), Saito et al.
patent: 5438447 (1995-08-01), Kunii
Dougherty Thomas M.
Kabushiki Kaisha Toshiba
Tamai Karl I.
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