Patent US4339697A successfully refreshed from Google Patents.
US4339697A
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Propulsion motor control apparatus and method
Assignee: Bombardier Transportation Holdings USA Inc
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Filing: 1980-05-13
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Granted: 1982-07-13
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Expires: 2000-05-13
Abstract
Abstract There is disclosed a motor control chopper apparatus and method having a random frequency of operation with a long term average deviation of substantially zero to reduce the average magnitude of the chopper apparatus generated noise signals.
Inventors
- 👤 James H. Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:06
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/291; H02M; H02M1/00; H02M1/44; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/72; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/915; Y10S388/917
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
147 words
In control apparatus for a motor operative with a power supply and in relation to a control signal within a known frequency bandwidth, the combination of: switch means coupled between the power supply and the motor and having a duty cycle for determining the average operation of the motor; means providing a first signal having a reference frequency and a predetermined magnitude; means providing a motor operation error signal having a magnitude in response to at least one of the actual operation of the motor and a desired operation for said motor; means coupled with the switch means for determining said duty cycle and the average operation of said motor in accordance with a comparison of the magnitude of said first signal and the magnitude of said error signal; and means coupled with the first signal providing means for providing a predetermined deviation of said reference frequency.
Claim 2
Dependent Claim
147 words
In control apparatus for a motor operative with a power supply and in relation to a control signal within a known frequency bandwidth, the combination of: switch means coupled between the power supply and the motor and having a duty cycle for determining the average operation of the motor; means providing a first signal having a reference frequency and a predetermined magnitude; means providing a motor operation error signal having a magnitude in response to at least one of the actual operation of the motor and a desired operation for said motor; means coupled with the switch means for determining said duty cycle and the average operation of said motor in accordance with a comparison of the magnitude of said first signal and the magnitude of said error signal; and means coupled with the first signal providing means for providing a predetermined deviation of said reference frequency.
Claim 3
Dependent Claim
42 words
The control apparatus of claim 1, with said predetermined deviation of the reference frequency changing for each operational cycle of said switch means and having a substantially zero average deviation when considered over a plurality of operational cycles of said switch means.
Claim 4
Dependent Claim
53 words
The control apparatus of claim 1: with the first signal comprising a ramp having a substantially constant magnitude; and with the magnitude of the error signal having a percentage relationship with the ramp magnitude in accordance with the difference between the actual operation of the motor and the desired operation of the motor.
Claim 5
Dependent Claim
44 words
The control apparatus of claim 1, with the first signal means controlling the operational cycles of the switch means and with the predetermined deviation providing means including a random signal source for modifying said reference frequency for each operational cycle of the switch means.
Claim 6
Dependent Claim
43 words
The control apparatus of claim 1, with said predetermined deviation of the reference frequency reducing the average noise signal generated by said switch means for each operational cycle of said switch means in relation to the known frequency bandwidth of said control signal.
Claim 7
Dependent Claim
40 words
The control apparatus of claim 1, including means for sensing the actual current of said motor and with the actual operation of the motor being in accordance with the sensed motor current supplied to the motor by said switch means.
Claim 8
Dependent Claim
138 words
In the method of controlling the current supplied to a vehicle propulsion motor from a power source in relation to a vehicle control signal within a known frequency bandwidth, the steps of: determining the average current supplied to said motor in accordance with the duty cycle of a switching device; providing a reference signal having a predetermined frequency and a first magnitude to determine the operation frequency of the switching device; providing a motor current signal having a second magnitude for comparison with said first magnitude to determine the duty cycle of the switching device, with said second magnitude being responsive to the actual current of the motor; and providing a predetermined frequency variation of the reference signal in a random manner such that the average variation of that frequency is substantially zero over an extended time period.
Claim 9
Dependent Claim
138 words
In the method of controlling the current supplied to a vehicle propulsion motor from a power source in relation to a vehicle control signal within a known frequency bandwidth, the steps of: determining the average current supplied to said motor in accordance with the duty cycle of a switching device; providing a reference signal having a predetermined frequency and a first magnitude to determine the operation frequency of the switching device; providing a motor current signal having a second magnitude for comparison with said first magnitude to determine the duty cycle of the switching device, with said second magnitude being responsive to the actual current of the motor; and providing a predetermined frequency variation of the reference signal in a random manner such that the average variation of that frequency is substantially zero over an extended time period.
Claim 10
Dependent Claim
22 words
The method of claim 7, with the second magnitude having a percentage relationship to the first magnitude for determining said duty cycle.
Claim 11
Dependent Claim
36 words
The method of claim 7, with said predetermined frequency variation reducing any harmonic signal noise resulting from the switching device in relation to said known frequency bandwidth without changing the duty cycle of the switching device.
Claim 12
Dependent Claim
38 words
The method of claim 7, with the second magnitude of the error signal being less than and having a percentage relationship with the first magnitude of the reference signal to determine the duty cycle of the switching device.
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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |