Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-08-14
1999-06-15
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310156, 310180, H02K 300, H02K 2302
Patent
active
059125225
ABSTRACT:
This PMDC machine concept operates from a constant dc voltage source with maximum torque capacity throughout its rotational speed range. The back electromotive force (back-emf) produced by the machine windings under the constant amplitude air gap field produced by the magnets is controlled by changing the winding configurations in series-parallel combinations. Torque is, thus, controlled from minimum to maximum speed without exceeding winding current capacities and without need to increase driving voltage with speed. At startup and low speed the combined back-emf of series connected windings limit current while producing maximum torque. At higher speeds where back-emf would severely limit torque, the windings are connected in series-parallel combinations for maximum achievable torque without exceeding winding current capacities. To accomplish this, windings concentrated in slots are used. Result is optimum utilization of core magnetics and capability of operating at constant input voltage.
REFERENCES:
patent: 2611799 (1952-09-01), Ackerman
patent: 4217529 (1980-08-01), Bourke et al.
patent: 4692645 (1987-09-01), Gotou
patent: 5202599 (1993-04-01), Kao
patent: 5412268 (1995-05-01), Arnaud et al.
patent: 5442250 (1995-08-01), Stridsberg
patent: 5614775 (1997-03-01), Horski et al.
patent: 5614799 (1997-03-01), Anderson et al.
Excerpts from a book entitled: "Brushless Permanent-Magnet Motor Design" by Duane C. Hanselman, published in 1994 by McGraw Hill, Inc., New York; pp. 61-123 and 155-180.
Jan. 1996--Article entitled "Brushless DC Motor Provides High Power Density and High Efficiency at Low Cost for Electric Transportation" by Neil Garcia-Sinclair. Jan. 1996 issue of PCIM magazine at pp. 9, 10, 12, 14, 16, 19 and 20.
Hall William D.
Mullins B.
Ramirez Nestor
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