Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
1999-03-11
2001-08-21
Masih, Karen (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S254100, C318S434000, C318S132000, C318S798000, C318S430000, C318S434000
Reexamination Certificate
active
06278254
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to methods and apparatus for motors, anode rotators, and/or high speed starters.
BACKGROUND OF THE INVENTION
Anode rotators, also known as high speed starters, generally, are known in the art. An anode rotator supplies current to a stator which causes the spinning of a rotor of an X-ray tube (or motor) at different speeds. Low speed is typically operated at 50-60 Hertz (line operated) and high speed is operated at 180 hertz. There is a need for improved anode rotators.
SUMMARY OF THE INVENTION
The present invention in one embodiment provides an apparatus comprised of a processor, a display, and a current measuring device. The current measuring device is adapted to measure the current in a first winding of a first stator of an alternating current motor. The processor causes a first message to be placed on the display if the current in the first winding of the first stator falls outside a first range of a first high value and a first low value.
The apparatus may be further comprised of a memory device. The first high value and the first low value can be stored in the memory device. The current measuring device may have two input ports, for measuring current in first and second windings of the first stator of the alternating current motor. The processor may cause a second message to be placed on the display if the current in the second winding of the first stator falls outside a second range of a second high value and a second low value.
The apparatus may further be comprised of a first relay device for selecting between a first start signal and a first run signal. During a start time period, the processor may send a signal to a control input port of the first relay device to cause the first start signal to be transmitted through the first relay device to the first winding of the first stator. During a run time period, the processor may send a signal to the control input port of the first relay device to cause the first run signal to be transmitted through the first relay device, and to thus be applied to the first winding of the first stator.
The first start signal and first run signal can be alternating voltages having a frequency of sixty hertz.
The apparatus may also include a phase shifter. The phase shifter may have an input port connected to the output port of the first relay device and an output port connected to a second winding of the first stator.
A second relay device may be provided for selecting between a second start signal and a second run signal. During a second start time period, the processor sends a signal to the control input port of the second relay device to cause the second start signal to be applied to the first winding of the first stator. During a second run time period the processor sends a signal to the control input port of the second relay device to cause the second run signal to be applied to the first winding of the first stator.
The first start signal and the first run signal may have a low frequency while the second start signal and the second run signal may have a second frequency substantially higher than the first frequency. The first frequency may be about sixty hertz and the second frequency may be about one hundred and eighty hertz.
The first start signal may have a first alternating voltage which has a high amplitude, such as 500 volts, and the second alternating voltage may have an amplitude substantially lower than the first alternating voltage, such as 65 volts.
A keypad may be provided comprised of a plurality of buttons and having an output port connected to the input port of the processor. A second relay device may be provided for selecting among a plurality of stators.
There can be three switches connected to an interface circuit corresponding to three stators. An operator activates the first of the three switches (such as by pressing a button) to cause a second relay device to transmit signals to a first stator. An operator activates the second of the three switches to cause a second relay device to transmit signals to a second stator. An operator may activate the third of the three switches to cause a second relay device to transmit signals to a third stator.
Pressing one or more buttons of the keypad in a another sequence causes the processor to obtain a first current measurement from the current measurement device, to add a high constant to the first current measurement to obtain the first high value, to add a low constant to the first current measurement to obtain a first low value, and to store the first high value and the first low value in the memory device.
REFERENCES:
patent: 5245496 (1993-09-01), Kim et al.
patent: 5835786 (1998-11-01), Brown et al.
patent: 5875087 (1999-02-01), Spencer et al.
Masih Karen
Teneza, Jr. Walter J.
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