US3564254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spin motor controller for a rotating anode motor of an x-ray generator tube
Assignee: Westinghouse Electric Corp
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Filing: 1968-07-17
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Granted: 1971-02-16
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Expires: 1988-07-17
Abstract
Abstract A solid state spin motor controller responsive to monostable multivibrator circuitry for starting the motor, sensing that the motor has come up to speed properly, and preventing the application of excitation to the anode of the X-ray generator tube in the event the motor has not properly come up to speed or fails to operate continuously.
Inventors
- 👤 Melvin P Siedband
- 👤 Jack L James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:28
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/42; H02P1/423; H02P1/426; H03; H03K; H03K5/00; H05; H05G; H05G1/00; H05G1/08; H05G1/66
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
184 words
In a spin motor controller for a rotating anode motor of an X-ray generator tube wherein the motor has at least two windings displaced in phase, the combination comprising: monostable multivibrator means having a stable state but being responsive to an input signal to assume an unstable state from which it returns and a recovery state during its return to said stable state; said monostable multivibrator means including first and second cross connected switching devices and time delay means interconnecting said switching devices; said time delay means connected to determine the time said multivibrator means is in its unstable state and to determine the time said monostable multivibrator means is in its recovery state; means for providing an input signal to said monostable multivibrator means; means for providing a starting voltage to said windings when said monostable multivibrator means is in said unstable state, and means responsive to the back emf induced in the one of said windings by the other when said monostable multivibrator means is in said recovery state for determining motor speed before energizing the anode of said X-ray generator tube.
Claim 2
Dependent Claim
184 words
In a spin motor controller for a rotating anode motor of an X-ray generator tube wherein the motor has at least two windings displaced in phase, the combination comprising: monostable multivibrator means having a stable state but being responsive to an input signal to assume an unstable state from which it returns and a recovery state during its return to said stable state; said monostable multivibrator means including first and second cross connected switching devices and time delay means interconnecting said switching devices; said time delay means connected to determine the time said multivibrator means is in its unstable state and to determine the time said monostable multivibrator means is in its recovery state; means for providing an input signal to said monostable multivibrator means; means for providing a starting voltage to said windings when said monostable multivibrator means is in said unstable state, and means responsive to the back emf induced in the one of said windings by the other when said monostable multivibrator means is in said recovery state for determining motor speed before energizing the anode of said X-ray generator tube.
Claim 3
Dependent Claim
47 words
The circuitry of claim 1 wherein said time delay means including energy storage means connected to discharge energy to determine the time said multivibrator means is in its unstable state and to store energy to determine the time said monostable multivibrator means is in its recovery state.
Claim 4
Dependent Claim
13 words
The circuitry of claim 2 wherein said energy storage means includes capacitive means.
Claim 5
Dependent Claim
19 words
The combination of claim 1 wherein said two windings are a shifted phase winding and a fixed phase winding.
Claim 6
Dependent Claim
60 words
The combination of claim 1 wherein said two windings are a shifted phase winding and a fixed phase winding; and said means for determining motor speed includes means for disconnecting said shifted phase winding during the recovery state of said monostable multivibrator means; and means for sensing back emf induced in said shifted phase winding by said fixed phase winding.
Claim 7
Dependent Claim
36 words
The combination of claim 5 including latching means responsive to said means for sensing back emf for preventing excitation of said anode should the sensed back emf indicate the motor is not up to proper speed.
Claim 8
Dependent Claim
50 words
The combination of claim 1 wherein said means for providing a starting voltage to said windings includes a first bidirectional semiconductor switching means and a second bidirectional semiconductor switching means responsive to the unstable state of said monostable multivibrator means for connecting said starting voltage to said phase displaced windings.
Claim 9
Dependent Claim
25 words
The combination of claim 7 wherein said second switching means disconnects one of sAid windings when said monostable multivibrator means is in its recovery state.
Claim 10
Dependent Claim
25 words
The combination of claim 8 wherein said second switching means reconnects said one of said windings after the recovery state of said monostable multivibrator means.
Claim 11
Dependent Claim
40 words
The combination of claim 1 wherein said means for providing a running voltage to said windings includes a bidirectional semiconductor switching means for connecting a running voltage to said windings when said monostable multivibrator means returns to said stable state.
Claim 12
Dependent Claim
71 words
The combination of claim 10 including another bidirectional semiconductor switching means which is inhibited by the unstable state of said monostable multivibrator means to prevent energization of said third switching means. 12 The combination of claim 7 including yet another bidirectional semiconductor switching means which is responsive to the unstable state of said multivibrator means for energizing said first switching means to connect over voltage to the other of said windings.
Claim 13
Dependent Claim
49 words
The combination of claim 7 including yet another bidirectional semiconductor switching means, amplifier means and voltage detector means; said yet another switching means responsive to said amplifier means and voltage detector means for energizing said second semiconductor means to control the voltage to said one of said phase windings.
Claim 14
Dependent Claim
36 words
The combination of claim 13 wherein said amplifier means includes a semiconductor device responsive to the return of said monostable multivibrator means to said stable state for amplifying a voltage signal to said voltage detector means.
Claim 15
Dependent Claim
44 words
The combination of claim 14 wherein said voltage detector means includes the second semiconductor device responsive to the voltage output from said amplifier means exceeding a predetermined value for energizing said yet another semiconductor switching means and hence closing said second semiconductor switching means.
Claim 16
Dependent Claim
79 words
The combination of claim 5 including controlled rectifier means responsive to the absence of a back emf in said shifted phase winding during the unstable state of said monostable multivibrator means for preventing application of excitation to said anode means responsive to the back emf during the unstable state of said monostable multivibrator means for preventing application of excitation to said anode in the absence of a back emf indicative of the motor not being up to proper speed.
Claim 17
Dependent Claim
19 words
The combination of claim 16 including means for preventing application of said excitation until another input signal is initiated.
Claim 18
Dependent Claim
45 words
The apparatus of claim 16 including a third semiconductor device responsive to the condition of said controlled rectifier means, the condition of one switch of the monostable multivibrator means, and the condition of said means for sensing back emf for controlling excitation to said anode.
Claim 19
Dependent Claim
47 words
The apparatus of claim 16 including additional energy storage means connected to sense the back emf through said shifted phase winding, to sense the current through said shifted phase winding and to sense current through said fixed phase winding for determining when each sensed quantity is present.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |