US3795854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for driving an electric pulse motor having duty cycle control of winding excitation signals
Assignee: Fujitsu Ltd
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Filing: 1971-12-13
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Granted: 1974-03-05
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Expires: 1991-12-13
Abstract
Abstract In a system for driving an electric pulse motor by changing the exciting phase in turn and stepping the rotor of the electric pulse motor, the present invention utilizes a control circuit which repeats the forward and reverse stepping signals in a ratio according to the step position, and stops or vibrates the rotor in a predetermined position between the step positions which are determined by the number of exiting phases and the number of teeth per each phase. According to the present invention, a number of steps per unit distance larger than the number of steps per unit distance which are determined by the number of exciting phases and the number of teeth per each phase can be obtained by suitably determining the sequence of input pulses of a logic circuit which determines the exciting phases. According to the exciting system of the present invention, the number of steps and the quantity of steps are not restricted by the number of phases nor by the driving system. In the driving system, by further detecting the position of the displacement of the mechanical system driven by the pulse motor and providing an error detector circuit which operates on the pulse motor via the above-mentioned control circuit so as to bring detected value into coincidence with the command value, a more precise numerical control system can be provided.
Inventors
- 👤 K Kobayashi
- 👤 M Manabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:23
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/18; G05D3/183
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
A system for driving a pulse motor having a plurality of exciting coils and a rotor comprising: a. a source of command pulses having substantially uniform widths, b. means being connected between said (a) source and said pulse motor for controlling the stepping of said rotor, said stepping control means including: 1. a counter for counting said command pulses, and 2. circuit means connected to said counter which includes i. first means for selecting a predetermined plurality of said exciting coils to be excited simultaneously and for supplying exciting signals to said predetermined plurality of coils, and ii. second means for determining the duty cycle of each exciting signal supplied to said selected exciting coils as a function of the count in said counter.
Claim 2
Independent Claim
124 words
A system for driving a pulse motor having a plurality of exciting coils and a rotor comprising: a. a source of command pulses having substantially uniform widths, b. means being connected between said (a) source and said pulse motor for controlling the stepping of said rotor, said stepping control means including: 1. a counter for counting said command pulses, and 2. circuit means connected to said counter which includes i. first means for selecting a predetermined plurality of said exciting coils to be excited simultaneously and for supplying exciting signals to said predetermined plurality of coils, and ii. second means for determining the duty cycle of each exciting signal supplied to said selected exciting coils as a function of the count in said counter.
Claim 3
Dependent Claim
63 words
circuit means connected to said counter which includes i. first means for selecting a predetermined plurality of said exciting coils to be excited simultaneously and for supplying exciting signals to said predetermined plurality of coils, and ii. second means for determining the duty cycle of each exciting signal supplied to said selected exciting coils as a function of the count in said counter.
Claim 4
Dependent Claim
63 words
circuit means connected to said counter which includes i. first means for selecting a predetermined plurality of said exciting coils to be excited simultaneously and for supplying exciting signals to said predetermined plurality of coils, and ii. second means for determining the duty cycle of each exciting signal supplied to said selected exciting coils as a function of the count in said counter.
Claim 5
Dependent Claim
175 words
A system for driving a pulse motor according to claim 1 wherein said i means includes: means for changing the phase of excitation so as to step the rotor of said pulse motor in the forward direction or the reverse direction every time a positive pulse or negative pulse is received, and means for supplying the exciting signal to the exciting coils in accordance with said phase of excitation; and wherein said second means includes: a pulse generator for generating a plurality of control pulses having a constant period and varying pulse widths, a gate circuit for selecting a pulse out of said control pulses corresponding to the count in said counter, means for generating a group of positive pulses and negative pulses having a phase difference corresponding to the pulse width of said selected pulse, and means for supplying the overflow pulses of said counter and said group of positive pulses as positive pulses and the difference pulses of said counter and said group of negative pulses as negative pulses to said first means.
Claim 6
Dependent Claim
107 words
circuit means connected to said counter which includes i. a pulse generator coupled to said counter for generating control pulses having a constant period and variable pulse widths, ii. a gate circuit coupled to said pulse generator and said counter for selecting said predetermined plurality of coils to be excited simultaneously in accordance with the count in said counter and also for selecting a plurality of said control pulses to determine the duty cycle of each exciting signal supplied to said selected coils in accordance with the count in said counter, and iii. means for supplying said exciting signals to said predetermined plurality of said exciting coils.
Claim 7
Dependent Claim
107 words
circuit means connected to said counter which includes i. a pulse generator coupled to said counter for generating control pulses having a constant period and variable pulse widths, ii. a gate circuit coupled to said pulse generator and said counter for selecting said predetermined plurality of coils to be excited simultaneously in accordance with the count in said counter and also for selecting a plurality of said control pulses to determine the duty cycle of each exciting signal supplied to said selected coils in accordance with the count in said counter, and iii. means for supplying said exciting signals to said predetermined plurality of said exciting coils.
Claim 8
Dependent Claim
33 words
A system of driving a pulse motor according to claim 1 further comprising means for controlling the switching action of said second means on said exciting signal in synchronism with said command pulses.
Claim 9
Dependent Claim
20 words
A system of driving a pulse motor according to claim 1 wherein means are provided to chop said exciting signals.
Claim 10
Dependent Claim
72 words
A system of driving a pulse motor according to claim 1 further comprising: detecting means for detecting the displacement of said rotor and producing a position signal corresponding thereto, comparing means for comparing said position signal with said command pulses, compensation pulse generating means for generating compensation pulses in accordance with the difference between said position signal and said command pulses, and means for adding said compensation pulses to said command pulses.
Claim 11
Independent Claim
51 words
A system for driving a pulse motor having a plurality of exciting coils and a rotor comprising: a. a source of command pulses having substantially uniform widths, b. means being connected between said (a) source and said pulse motor for controlling the stepping of said rotor, said stepping control means including:
Claim 12
Independent Claim
51 words
A system for driving a pulse motor having a plurality of exciting coils and a rotor comprising: a. a source of command pulses having substantially uniform widths, b. means being connected between said (a) source and said pulse motor for controlling the stepping of said rotor, said stepping control means including:
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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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |