Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1980-07-02
1983-03-29
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318139, 318341, H02P 516
Patent
active
043785174
ABSTRACT:
To control the energization of an electric motor pulses of current are supplied to the motor from a power source, and the pulse mark/space ratio and the motor field strength are controlled to determine the output speed and torque of the motor. Means are provided for deriving information representative of the speed of the motor and the torque required to be developed by the motor at that speed, and means are provided for determining information representative of the pulse mark/space ratio and the motor field strength necessary to provide the required torque at the said derived speed such that power losses are minimized. This makes it possible to control the motor field strength and mark/space ratio in accordance with the determined information to achieve optimum efficiency.
REFERENCES:
patent: 3735220 (1973-05-01), Ren ner et al.
patent: 3841238 (1974-10-01), Thompson
patent: 4037144 (1977-07-01), Ohmae et al.
patent: 4153863 (1979-05-01), Schachte et al.
patent: 4172231 (1979-10-01), d'Alayer de Costemore d'Arc et al.
patent: 4247807 (1981-01-01), Wilson
Jones John
Morton John
Cableform Limited
Smith Jr. David
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