US4119902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acceleration/deceleration control circuit for a stepping motor
Assignee: MESUR MATIC ELECTRONICS CORP
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Filing: 1977-07-08
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Granted: 1978-10-10
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Expires: 1997-07-08
Abstract
Abstract An acceleration/deceleration control circuit for a stepping motor includes a plural stage up/down counter connected to a source of pulses of constant repetition rate. The up/down counter output is connected to a decoder, such as a digital/analog converter, and conventionally, the output of the decoder is coupled to a variable rate oscillator, whose frequency increases, for example, as the output voltage of the digital/analog converter increases, and vice versa. The variable rate output is provided as an input to the stepping motor. In the improved arrangement a series RC circuit is coupled to the output of the decoder and the input of the variable rate oscillator is connected across the capacitor.
Inventors
- 👤 Harold R. Newell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:57
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/00006; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; H03K7/00; H03K7/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
An improved acceleration control for a stepping motor which includes a source of pulses of constant frequency, a plural stage up/down counter with one input for stepping said counter is one direction connected to said source of pulses, decoding means connected to plural stage outputs of said counter for providing a voltage corresponding to a count stored in said counter, a variable frequency oscillator responsive to said voltage for providing pulses at a rate related to said voltage, said variable frequency oscillator having an output supplying pulses to said stepping motor, said output also connected to a further input of said plural stage up/down counter for stepping said counter in another direction wherein the improvement comprises integrating means connected between said decoder means and said variable frequency oscillator.
Claim 2
Dependent Claim
128 words
An improved acceleration control for a stepping motor which includes a source of pulses of constant frequency, a plural stage up/down counter with one input for stepping said counter is one direction connected to said source of pulses, decoding means connected to plural stage outputs of said counter for providing a voltage corresponding to a count stored in said counter, a variable frequency oscillator responsive to said voltage for providing pulses at a rate related to said voltage, said variable frequency oscillator having an output supplying pulses to said stepping motor, said output also connected to a further input of said plural stage up/down counter for stepping said counter in another direction wherein the improvement comprises integrating means connected between said decoder means and said variable frequency oscillator.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 wherein said integrating means comprises serially connected resistor and capacitor, with said variable frequency oscillator connected across said capacitor.
Claim 4
Dependent Claim
130 words
A pulse control circuit for smoothing pulse rate changes between an input line and an output line when said input line is subjected to discrete pulse groups each of which includes pulses at a fixed repetition rate, said control circuit comprising: a plural stage up/down counter with said input line connected to an up counting input thereof, a digital to analog converter connected to outputs of plural stages of said counter, a series resistance-capacitance circuit connected to said digital to analog converter, a variable repetition rate pulse source having a control input for controlling pulse repetition rate of output pulses produced thereby and connected to said capacitance, said variable repetition rate pulse source having an output coupled to said output line and to a down count input of said counter.
Claim 5
Dependent Claim
130 words
A pulse control circuit for smoothing pulse rate changes between an input line and an output line when said input line is subjected to discrete pulse groups each of which includes pulses at a fixed repetition rate, said control circuit comprising: a plural stage up/down counter with said input line connected to an up counting input thereof, a digital to analog converter connected to outputs of plural stages of said counter, a series resistance-capacitance circuit connected to said digital to analog converter, a variable repetition rate pulse source having a control input for controlling pulse repetition rate of output pulses produced thereby and connected to said capacitance, said variable repetition rate pulse source having an output coupled to said output line and to a down count input of said counter.
Claim 6
Dependent Claim
31 words
The circuit of claim 3 in which said up/down counter has a zero count output, said variable rate pulse source has a stop input, with said zero count output connected thereto.
Claim 7
Dependent Claim
21 words
The apparatus of claim 3 in which said variable rate pulse source has a disable input coupled to said input line.
References Cited (Backward Citations)
US3886459A
Cited
US3899729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |