Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1990-03-06
1992-08-18
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318794, 318254, 378109, 378131, H02P 144, H05G 134
Patent
active
051402467
ABSTRACT:
A sationary rotatable anode (42) of an x-ray tube (10) is electrically connected to a high speed starter (24). The starter (24) includes an inductive rotor (44) connected to the anode (42), a main stator winding (50) and an auxiliary stator winding (52). The rotor (44) is driven by a power drive circuit (26) which is part of the starter (24). A main capacitor (64) is placed in series with the main winding for reducing its inductance. An auxiliary capacitor (66) is placed in series with the auxiliary winding for maintaining a selective impedence. A control circuit (90) is included in the starter (24) to control the main current and auxiliary current so that as the rotation of the rotor (44) increases, the control circuit (90) lowers the frequency of the main current and the auxiliary current passing to the main and auxiliary windings.
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patent: 5039933 (1991-08-01), Dong
Cabeca John
Picker International Inc.
Shoop Jr. William M.
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