US4580083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chopper controller for a D.C. motor
Assignee: Hitachi Ltd
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Filing: 1984-09-19
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Granted: 1986-04-01
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Expires: 2004-09-19
Abstract
Abstract A chopper controller for a D.C. motor controls currents flowing in an armature winding and a field winding of the D.C. motor by controlling an armature chopper and a field chopper in accordance with a command from a command generator such as an accelerator pedal. The armature chopper and the field chopper are controlled by chopper control signals from an armature chopper control circuit and a field chopper control circuit, respectively. Those chopper control signals are in a predetermined phase relationship and an interruption request signal is issued in phase-synchronism with one of the chopper control signals. In response to the interruption request signal, computing means computes an armature chopper duty factor and a field chopper duty factor in accordance with the command from the command generator and supplies them to the chopper control circuits.
Inventors
- 👤 Tsutomu Omae
- 👤 Katsuji Marumoto
- 👤 Shotaro Naito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:46
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/0077; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/298; H02P7/2985; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902; Y10S388/907; Y10S388/909; Y10S388/912; Y10S388/923; Y10S388/934
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
378 words
A chopper controller for a D.C. motor comprising: (a) a D.C. power supply; (b) an armature chopper for chopping a current supplied to an armature winding of said D.C. motor from said D.C. power supply to control the current flowing in said armature winding; (c) a field chopper for chopping a current supplied to a field winding of said D.C. motor from said D.C. power supply to control the current flowing in said field winding; (d) a command signal generator for commanding a magnitude of at least one of a driving force and a rotation speed of said D.C. motor; (e) detection means for detecting the armature current and the field current flowing in said armature winding and said field winding, respectively, of said D.C. motor; (f) computing means including command calculating means for calculating an armature current command and a field current command based on a command signal associated with the command from said command signal generator, said computing means further including means for calculating a duty factor of said armature chopper and a duty factor of said field chopper based on said armature current command and said field current command from said command calculating means and an armature current and the field current detected by said detection means; (g) an armature chopper control circuit for producing an armature chopper control signal to control turn-on and turn-off of said armature chopper in accordance with the armature duty factor computed by said computing means, said armature chopper control signal being supplied to said armature chopper; (h) a field chopper control circuit for producing a field chopper control signal to control turn-on and turn-off of said field chopper in accordance with the field duty factor computed by said computing means, said field chopper control signal being supplied to said field chopper; (i) an interruption request pulse signal generating circuit for generating an interruption request pulse signal in synchronism with one of said armature chopper control signal and said field chopper control signal; and (j) means for operating said command calculating means in a normal operation state and responsive to said interruption request pulse signal for interrupting said command calculating means and operating said duty factor calculating means during an interrupt operation state initiated by said interruption request pulse signal.
Claim 2
Dependent Claim
378 words
A chopper controller for a D.C. motor comprising: (a) a D.C. power supply; (b) an armature chopper for chopping a current supplied to an armature winding of said D.C. motor from said D.C. power supply to control the current flowing in said armature winding; (c) a field chopper for chopping a current supplied to a field winding of said D.C. motor from said D.C. power supply to control the current flowing in said field winding; (d) a command signal generator for commanding a magnitude of at least one of a driving force and a rotation speed of said D.C. motor; (e) detection means for detecting the armature current and the field current flowing in said armature winding and said field winding, respectively, of said D.C. motor; (f) computing means including command calculating means for calculating an armature current command and a field current command based on a command signal associated with the command from said command signal generator, said computing means further including means for calculating a duty factor of said armature chopper and a duty factor of said field chopper based on said armature current command and said field current command from said command calculating means and an armature current and the field current detected by said detection means; (g) an armature chopper control circuit for producing an armature chopper control signal to control turn-on and turn-off of said armature chopper in accordance with the armature duty factor computed by said computing means, said armature chopper control signal being supplied to said armature chopper; (h) a field chopper control circuit for producing a field chopper control signal to control turn-on and turn-off of said field chopper in accordance with the field duty factor computed by said computing means, said field chopper control signal being supplied to said field chopper; (i) an interruption request pulse signal generating circuit for generating an interruption request pulse signal in synchronism with one of said armature chopper control signal and said field chopper control signal; and (j) means for operating said command calculating means in a normal operation state and responsive to said interruption request pulse signal for interrupting said command calculating means and operating said duty factor calculating means during an interrupt operation state initiated by said interruption request pulse signal.
Claim 3
Dependent Claim
41 words
A chopper controller for a D.C. motor according to claim 1 wherein said armature chopper control signal from said armature chopper control circuit and said field chopper control signal from said field chopper control circuit are produced synchronously with each other.
Claim 4
Dependent Claim
43 words
A chopper controller for a D.C. motor according to claim 1 wherein said armature chopper control signal from said armature chopper control circuit and said field chopper control signal from said field chopper control circuit are produced with a predetermined phase difference therebetween.
Claim 5
Dependent Claim
69 words
A chopper controller for a D.C. motor according to claim 3 wherein said armature chopper control circuit is adapted to turn off said armature chopper a predetermined time period after said field chopper has been turned off, said predetermined time period being sufficiently shorter than a chopper period and long enough to allow said computing means to read in at least said armature current detected by said detection means.
Claim 6
Dependent Claim
57 words
A chopper controller for a D.C motor according to claim 4 wherein said interruption pulse signal generating circuit generates said interruption pulse signal in synchronism with the turn-on of said field chopper, said computing means being responsive to said interruption pulse signal for reading in said armature current and said field current detected by said detection means.
Claim 7
Dependent Claim
77 words
A chopper controller for a D.C. motor according to claim 1 wherein said computing means includes a chopper period control circuit for calculating chopper periods of said armature chopper and said field chopper based on said command signal and at least one of said armature current and said field current and controlling periods of said armature chopper control signal from said armature chopper control circuit and said field chopper control signal from said field chopper control circuit.
Claim 8
Dependent Claim
44 words
A chopper controller for a D.C. motor according to claim 6 wherein said computing means computes said chopper period T c such that the value T c ·α a (1-α a ) is kept substantially constant, where α a is said armature duty factor.
Claim 9
Dependent Claim
61 words
A chopper controller for a D.C. motor according to claim 1 wherein said armature chopper control circuit and said field chopper control circuit produce said armature chopper control signal and said field chopper control signal, respectively, of predetermined periods, respectively, and further comprising timer means for measuring time by summing said chopper period each time said interruption request pulse is issued.
Claim 10
Dependent Claim
37 words
A chopper controller for a D.C. motor according to claim 6 further comprising timer means for measuring time by summing said chopper period computed by said computing means each time said interruption request pulse signal is issued.
Claim 11
Dependent Claim
38 words
A chopper controller for a D.C. motor according to claim 1 further comprising chopper control suppression means for suppressing the feed of said chopper control signals to at least one of said armature chopper and said field chopper.
Claim 12
Dependent Claim
40 words
A chopper controller for a D.C. motor according to claim 10 wherein said chopper control suppression means is operative to keep said armature chopper control circuit and said field chopper control circuit activated during the suppression of the chopper control
Claim 13
Dependent Claim
38 words
A chopper controller for a D.C. motor according to claim 6 further comprising chopper control suppression means for suppressing the feed of said chopper control signals to at least one of said armature chopper and said field chopper.
Claim 14
Dependent Claim
37 words
A chopper controller for a D.C. motor according to claim 12 wherein said chopper control suppression means is operative to shorten said chopper period than a normal operation chopper period during the suppression of the chopper control.
Claim 15
Dependent Claim
61 words
A chopper controller for a D.C. motor according to claim 1 further comprising protection means for detecting a temperature of at least one of said D.C. motor, said armature chopper, said field chopper and said D.C. power supply to control said armature chopper control circuit to reduce the current in said armature winding when the detected temperature exceeds a predetermined temperature.
Claim 16
Dependent Claim
42 words
A chopper controller for a D.C. motor according to claim 1 further comprising protection means for controlling said armature chopper control circuit to reduce the current in said armature winding when the voltage of said D.C. power supply exceeds a predetermined level.
Claim 17
Dependent Claim
48 words
A chopper controller for a D.C. motor according to claim 1 further comprising protection means for detecting a rotation speed of said D.C. motor to control said armature chopper control circuit to reduce the current in said armature winding when the detected rotation speed exceeds a predetermined speed.
Claim 18
Dependent Claim
53 words
A chopper controller for a D.C. motor according to claim 1 further comprising protection means for detecting at least one of said armature current and said field current to block the circuit for feeding the current to said D.C. motor to said D.C. power supply when the detected current exceeds a predetermined level.
Claim 19
Dependent Claim
23 words
A chopper controller for a D.C. motor according to claim 14 further comprising means for indicating alarm when said protection means is actuated.
Claim 20
Dependent Claim
23 words
A chopper controller for a D.C. motor according to claim 15, further comprising means for indicating alarm when said protection means is actuated.
Claim 21
Dependent Claim
23 words
A chopper controller for a D.C. motor according to claim 16, further comprising means for indicating alarm when said protection means is actuated.
Claim 22
Dependent Claim
23 words
A chopper controller for a D.C. motor according to claim 17, further comprising means for indicating alarm when said protection means is actuated.
Claim 23
Dependent Claim
55 words
A chopper controller for a D.C. motor according to claim 1, wherein said armature chopper control signal from said armature chopper circuit and said field chopper control signal from said field chopper control circuit are produced with a predetermined phase difference therebetween to prevent the simultaneous turn-off of said armature chopper and said field chopper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |