US3766458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for driving a self-excited pulse motor in accordance with the movement of the rotor
Assignee: Fujitsu Ltd
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Filing: 1971-12-23
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Granted: 1973-10-16
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Expires: 1991-12-23
Abstract
Abstract A driving circuit of a self-excited pulse motor controls the stator in accordance with the movement of the rotor. The driving circuit includes a phase difference switching circuit for switching the phase difference between the phase of the motor and the exciting phase of the stator in correspondence with the speed of rotation of the rotor. The phase difference is switched every time that the speed of rotation reaches a predetermined speed, thereby compensating for the reduction of the torque during high speed rotation based on the time lag of an exciting signal in a feedback loop.
Inventors
- 👤 T Nishimura
- 👤 Y Kibe
- 👤 Y Yokoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:03
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14; H02K; H02K29/00; H02K29/06; H02K29/10; H02K29/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
195 words
A pulse motor driving system for a pulse motor having a rotor and a stator having stator windings, said pulse motor driving system comprising rotor position detectiNg means for producing a signal corresponding to the position of the rotor, said rotor position detecting means including a pulse generating disc affixed to, and rotating with, the shaft of the rotor; speed detecting means for producing a speed signal corresponding to the speed of rotation of the rotor, said speed detecting means including the pulse generating disc; excitation switching means connected to the rotor position detecting means for sequentially exciting each stator winding with a phase difference for a phase of the stator corresponding to the position of the rotor by a signal corresponding to the rotor position; and phase difference switching means having inputs connected to the excitation switching means and coupled to the speed detecting means and outputs coupled to the stator windings for switching the phase difference between the phase of the stator corresponding to the position of the rotor and the exciting phase of the stator when the speed of rotation of the rotor reaches a predetermined magnitude corresponding to the speed signal.
Claim 2
Dependent Claim
195 words
A pulse motor driving system for a pulse motor having a rotor and a stator having stator windings, said pulse motor driving system comprising rotor position detectiNg means for producing a signal corresponding to the position of the rotor, said rotor position detecting means including a pulse generating disc affixed to, and rotating with, the shaft of the rotor; speed detecting means for producing a speed signal corresponding to the speed of rotation of the rotor, said speed detecting means including the pulse generating disc; excitation switching means connected to the rotor position detecting means for sequentially exciting each stator winding with a phase difference for a phase of the stator corresponding to the position of the rotor by a signal corresponding to the rotor position; and phase difference switching means having inputs connected to the excitation switching means and coupled to the speed detecting means and outputs coupled to the stator windings for switching the phase difference between the phase of the stator corresponding to the position of the rotor and the exciting phase of the stator when the speed of rotation of the rotor reaches a predetermined magnitude corresponding to the speed signal.
Claim 3
Dependent Claim
140 words
A pulse motor driving system as claimed in claim 1, wherein the speed detecting means has an input coupled to the rotor and two outputs, and further comprising a timer circuit connected to one of the outputs of the speed detecting means for producing more than one standard pulse of different duration in accordance with the speed signal and switch signal generating means having an input connected to the other of the outputs of the speed detecting means, inputs connected to the timer circuit and outputs connected to the phase difference switching means for producing a switching signal corresponding to the speed of rotation of the rotor in accordance with the relationship of the speed signal to the standard pulse, said switching signal switching the phase difference between the phase of the motor and the exciting phase of the stator.
Claim 4
Dependent Claim
69 words
A pulse motor driving system as claimed in claim 2, wherein the standard pulse produced by the timer circuit has a duration substantially equal to the time interval of the speed signal produced by the speed detecting means during a speed of rotation which is likely to produce one phase difference for the phase difference between the predetermined phase of the motor and the exciting phase of the stator.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |