Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-11-01
1992-01-28
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 52, 310 58, 181206, 181200, H02K 524, H02K 902, H02K 904, F01N 106
Patent
active
050846418
ABSTRACT:
The air-cooled type induction motor used for railway vehicles such as the electric car generates sound waves (noise) which are uncomfortable to the ears of the human being when it is rotated. An induction motor according to the present invention has therein a plurality of waveguide (or air guide) plates for efficiently exhausting air, which serves to cool the motor, outside the motor. These waveguide plates are arranged not to resonate with the frequency of the sound waves which are generated by the cooling air. The sound waves are guided outside the motor through the waveguide plates before it is amplified to a noise level which is uncomfortable to the ears of the human being. Noise caused when the motor is rotated at high speed can be thus eliminated.
REFERENCES:
patent: 2610992 (1952-09-01), Johns et al.
patent: 3407317 (1968-10-01), Honsinger
patent: 4250417 (1981-02-01), Arnold
patent: 4275321 (1981-06-01), Shimamoto et al.
patent: 4766337 (1988-08-01), Parkinson et al.
"On The Induction Motor For Use With Vehicles" of a magazine "Science of Electric Cars", Feb. edition, 1988, pp. 18-23.
Fujiwara Kazuyuki
Nagayama Takashi
Saima Tooru
Kabushiki Kaisha Toshiba
La Balle C.
Stephan Steven L.
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