Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1988-05-10
1989-11-14
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318805, H02P 540
Patent
active
048810223
ABSTRACT:
A method and apparatus is shown to control both the motor terminal current to vary in exact proportion as the motor shaft torque varies for any given excitation frequency. This obviates the need for ancillary motor speed control and prevents voltage boosting at low speeds from resulting in excessive motor losses for no load conditions. A motor is powered from an inverter, the inverter providing an output voltage with independent control of amplitude and frequency. A frequency signal is fed directly to the inverter from a frequency input, the frequency input also being connected to a multiplier. The multiplier provides the amplitude signal for the inverter based on the product of the input frequency and motor current.
REFERENCES:
patent: 3909687 (1975-09-01), Abbondanti
patent: 3989991 (1967-11-01), Brennen
Smith Jr. David
University of Auckland
LandOfFree
Method and/or apparatus for controlling the motor speed of an el does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and/or apparatus for controlling the motor speed of an el, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and/or apparatus for controlling the motor speed of an el will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1854516