US3593096A — Pulse control circuit for step motors

Claim 1

Independent Claim 461 words

In combination with a multiphase step motor having mechanical means for incrementally rotating a load in response to driving pulses applied in a preselected sequence to field windings of the motor to excite the respective motor phases, and with a driver circuit for supplying said driving pulses in response to input pulses applied thereto, said mechanical means of said motor having a known response time to the excitation of said motor phases before said load is rotated, means for generating pulses at a predetermined constant repetition rate, means responsive to incoming pulses occurring at a constant repetition rate for producing a set of serial pulses at a constant rate greater than said predetermined rate for each incoming pulse, each said set of pulses containing an identical number of pulses less than the total number of phases of said step motor, and each said set of pulses terminating a length of time prior to the onset of the next successive incoming pulse greater than said response time of said mechanical means to a number of said driving pulses equal to the number of pulses in each said set, means for selectively applying pulses generated by said generating means to said pulse set producing means as the incoming pulses therefor, and means for supplying the sets of pulses produced by said pulse set producing means to said driver circuit to provide a synchronized corresponding number of driving pulses from said driver circuit to the field windings of said motor, wherein said pulse set producing means includes monostable multivibrator means having n monostable multivibrator stages in cascade, where n is an integer 1 and is one less than the number of pulses in each said set, each of said multivibrator stages being normally in a stable state and having a quasistable state to which the respective stage is triggered in response to an incoming pulse, and having a predetermined delay time between assumption of said quasi-stable state and spontaneous return to said stable state selected to permit termination of each said set of pulses said Length of time prior to onset of the next successive incoming pulse to said pulse set producing means, the first said multivibrator stage connected to receive the incoming pulses to said pulse set producing means, and each succeeding multivibrator stage connected to receive an incoming pulse from the immediately preceding stage upon spontaneous return of said immediately preceding stage to its stable state, said pulse set producing means further including means responsive to a pulse produced by each multivibrator stage upon being triggered to its quasistable state and further responsive to the pulse produced by the last multivibrator stage upon return to its stable state for supplying those pulses in the sequence produced to said driver circuit supplying means.

Claim 2

Dependent Claim 461 words

In combination with a multiphase step motor having mechanical means for incrementally rotating a load in response to driving pulses applied in a preselected sequence to field windings of the motor to excite the respective motor phases, and with a driver circuit for supplying said driving pulses in response to input pulses applied thereto, said mechanical means of said motor having a known response time to the excitation of said motor phases before said load is rotated, means for generating pulses at a predetermined constant repetition rate, means responsive to incoming pulses occurring at a constant repetition rate for producing a set of serial pulses at a constant rate greater than said predetermined rate for each incoming pulse, each said set of pulses containing an identical number of pulses less than the total number of phases of said step motor, and each said set of pulses terminating a length of time prior to the onset of the next successive incoming pulse greater than said response time of said mechanical means to a number of said driving pulses equal to the number of pulses in each said set, means for selectively applying pulses generated by said generating means to said pulse set producing means as the incoming pulses therefor, and means for supplying the sets of pulses produced by said pulse set producing means to said driver circuit to provide a synchronized corresponding number of driving pulses from said driver circuit to the field windings of said motor, wherein said pulse set producing means includes monostable multivibrator means having n monostable multivibrator stages in cascade, where n is an integer 1 and is one less than the number of pulses in each said set, each of said multivibrator stages being normally in a stable state and having a quasistable state to which the respective stage is triggered in response to an incoming pulse, and having a predetermined delay time between assumption of said quasi-stable state and spontaneous return to said stable state selected to permit termination of each said set of pulses said Length of time prior to onset of the next successive incoming pulse to said pulse set producing means, the first said multivibrator stage connected to receive the incoming pulses to said pulse set producing means, and each succeeding multivibrator stage connected to receive an incoming pulse from the immediately preceding stage upon spontaneous return of said immediately preceding stage to its stable state, said pulse set producing means further including means responsive to a pulse produced by each multivibrator stage upon being triggered to its quasistable state and further responsive to the pulse produced by the last multivibrator stage upon return to its stable state for supplying those pulses in the sequence produced to said driver circuit supplying means.

Claim 3

Dependent Claim 10 words

The combination according to claim 1 wherein n 1 .

Claim 4

Dependent Claim 25 words

The combination according to claim 1 wherein the number of pulses in each said set is equal to half the total number of motor phases.

Claim 5

Dependent Claim 267 words

A control circuit for supplying pulses to sequentially excite the windings of a multiple phase step motor, said control circuit including, means for generating stepping pulses at a preselected pulse repetition rate, means responsive to said stepping pulses to produce for each stepping pulse a series of further pulses at a rate greater than said preselected rate, each said series of further pulses containing an identical number of pulses less than the number of motor phases, said greater rate being sufficiently rapid to terminate each series of further pulses with sufficient time remaining prior to production of the next successive stepping pulse to allow mechanical response of the motor to a like series of pulses applied to sequentially excite the windings thereof, and means responsive to each series of further pulses produced by said pulse series producing means for supplying a like series of pulses to said motor windings in a preselected sequential format, wherein said pulse series producing means comprises a monostable multivibrator, said multivibrator having a stable state in which it is normally operative and having a quasi-stable state into which it is triggered in response to one of said stepping pulses, and having a preselected delay time in which it spontaneously reassumes its stable state after having been triggered to the quasi-stable state, said delay time being sufficiently less than the interval between consecutive ones of said stepping pulses to provide said remaining time following each said series of further pulses, said multivibrator generating a first pulse upon assumption of its quasi-stable state and generating a second pulse upon return to its stable state.

Claim 6

Dependent Claim 267 words

A control circuit for supplying pulses to sequentially excite the windings of a multiple phase step motor, said control circuit including, means for generating stepping pulses at a preselected pulse repetition rate, means responsive to said stepping pulses to produce for each stepping pulse a series of further pulses at a rate greater than said preselected rate, each said series of further pulses containing an identical number of pulses less than the number of motor phases, said greater rate being sufficiently rapid to terminate each series of further pulses with sufficient time remaining prior to production of the next successive stepping pulse to allow mechanical response of the motor to a like series of pulses applied to sequentially excite the windings thereof, and means responsive to each series of further pulses produced by said pulse series producing means for supplying a like series of pulses to said motor windings in a preselected sequential format, wherein said pulse series producing means comprises a monostable multivibrator, said multivibrator having a stable state in which it is normally operative and having a quasi-stable state into which it is triggered in response to one of said stepping pulses, and having a preselected delay time in which it spontaneously reassumes its stable state after having been triggered to the quasi-stable state, said delay time being sufficiently less than the interval between consecutive ones of said stepping pulses to provide said remaining time following each said series of further pulses, said multivibrator generating a first pulse upon assumption of its quasi-stable state and generating a second pulse upon return to its stable state.

Claim 7

Dependent Claim 29 words

The invention according to claim 4 wherein said pulse series producing means further includes means for supplying said first and second pulses as a series of said further pulses.

Claim 8

Dependent Claim 112 words

The invention according to claim 4 wherein said pulse series producing means comprises a plurality of cascaded stages of monostable multivibrators each corresponding to the first-named monostable multivibrator, the number of said cascaded stages being one less than the number of pulses in each said series of further pulses, the first stage of said cascaded stages connected to receive stepping pulses from said stepping pulse generating means, each succeeding stage connected to receive said second pulse from the immediately preceding stage, and means for supplying said first pulse of each stage and the second pulse of the last stage in the sequence and spacing produced, as a series of said further pulses.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-07-12	1975-01-11	1975-07-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-07-12	1979-01-11	1979-07-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-07-12	1983-01-11	1983-07-13	$7700.00	Window Closed / Lapsed

Pulse control circuit for step motors

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