Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1979-11-30
1981-07-07
Smith, Jr, David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318510, 318512, H02P 742, H02P 764
Patent
active
042777364
ABSTRACT:
A turn off circuit for a multiphase motor is provided, comprising a D.C. powered system including a three element choke core having two outer cores with loosely coupled windings and a central core closely coupled to the outer cores to enhance pulse generation.
A modified SCR ring counter is provided to supply D.C. power to the load to produce a three phase wave shape with less wave distortion and lower noise.
Pulse width modulation is supplied to the negative SCRs of the ring counter through steering SCRs which are turned on by discharge from capacitors in the steering circuit.
Pulse width modulation is fed to the ring counter through the outer core elements, while the central core functions to improve pulse width of the discharge capacitors. Free wheeling energy from the motor is fed to the discharge capacitors and increases firing energy.
REFERENCES:
patent: 2697197 (1954-12-01), Brown
patent: 3351841 (1967-11-01), Lipman et al.
patent: 3406325 (1968-10-01), Rosa
patent: 3891913 (1975-06-01), Rao et al.
patent: 4128793 (1978-12-01), Stich
Jay Boyce & Associates
Krawitz Willie
Smith, Jr David
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