Patent US3609486A successfully refreshed from Google Patents.
US3609486A
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Method and apparatus for movement of mechanical members by an electric motor
Assignee: BASF SE
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Filing: 1969-10-13
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Granted: 1971-09-28
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Expires: 1989-10-13
Abstract
Abstract Method and apparatus for control of DC motor directly connected to actuating element of control or regulating device with step actuation of motor by pulse modulation in trains of individual pulses whose energy content is varied in dependence on the force requirement to move the mechanical member.
Inventors
- 👤 Heinrich Feldhoff
- 👤 Georg Schlereth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:37
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/18; G05D3/1445
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A method for the stepwise movement of a mechanical member by an electric motor which comprises energizing said motor for clockwise or counterclockwise step movement with a series of trains of individual pulses, controlling the number of said individual pulses in said trains and the pause between said trains by pulse modulation, and controlling the energy content of each of said individual pulses in said trains in dependence upon the instantaneous force required to move said mechanical member.
Claim 2
Independent Claim
78 words
A method for the stepwise movement of a mechanical member by an electric motor which comprises energizing said motor for clockwise or counterclockwise step movement with a series of trains of individual pulses, controlling the number of said individual pulses in said trains and the pause between said trains by pulse modulation, and controlling the energy content of each of said individual pulses in said trains in dependence upon the instantaneous force required to move said mechanical member.
Claim 3
Dependent Claim
32 words
A method as claimed in claim 1, wherein the energy content of said individual pulses is controlled by the output of a force-measuring instrument coupled to the mechanical member to be moved.
Claim 4
Dependent Claim
83 words
Apparatus for the stepwise movement of a mechanical member by an electric motor which comprises means for energizing said motor for clockwise or counterclockwise step movement with a series of trains of individual pulses, means for controlling the number of said indIvidual pulses in said trains and the pause between said trains by pulse modulation, and means for controlling the energy content of each of said individual pulses in said trains in dependence upon the instantaneous force required to move said mechanical member.
Claim 5
Dependent Claim
83 words
Apparatus for the stepwise movement of a mechanical member by an electric motor which comprises means for energizing said motor for clockwise or counterclockwise step movement with a series of trains of individual pulses, means for controlling the number of said indIvidual pulses in said trains and the pause between said trains by pulse modulation, and means for controlling the energy content of each of said individual pulses in said trains in dependence upon the instantaneous force required to move said mechanical member.
Claim 6
Dependent Claim
153 words
Apparatus for the stepwise movement of a mechanical member which comprises a DC disc armature motor directly coupled to said mechanical member, a power unit energizing said motor for clockwise and counterclockwise step movement with a series of trains of individual pulses obtained by controlled rectification from the AC mains, a phase shift circuit for each direction of rotation of said disc armature, said phase shift circuit triggering the corresponding controlled rectifier of said power unit, a force measuring means to control said phase shift circuit in dependence upon the instantaneous force requirement of said mechanical member, a trigger circuit for each of said phase shift circuits, and an amplifier which amplifies the deviation or error of a process control means in interaction with a feedback circuit from each of said trigger circuits to control the number of said individual pulses in said trains and the pause between said trains by pulse modulation.
Claim 7
Dependent Claim
153 words
Apparatus for the stepwise movement of a mechanical member which comprises a DC disc armature motor directly coupled to said mechanical member, a power unit energizing said motor for clockwise and counterclockwise step movement with a series of trains of individual pulses obtained by controlled rectification from the AC mains, a phase shift circuit for each direction of rotation of said disc armature, said phase shift circuit triggering the corresponding controlled rectifier of said power unit, a force measuring means to control said phase shift circuit in dependence upon the instantaneous force requirement of said mechanical member, a trigger circuit for each of said phase shift circuits, and an amplifier which amplifies the deviation or error of a process control means in interaction with a feedback circuit from each of said trigger circuits to control the number of said individual pulses in said trains and the pause between said trains by pulse modulation.
Claim 8
Dependent Claim
23 words
Apparatus as claimed in claim 4 in which said mechanical member is the stem of a process control valve having a single seat.
Claim 9
Dependent Claim
175 words
Apparatus for the stepwise movement of a stem of a process control valve having a single seat which comprises a DC disc armature motor directly coupled to said stem, a power unit energizing said motor for clockwise and counterclockwise step movement with a series of trains of individual pulses obtained by controlled rectification from the AC mains, a phase shift circuit for each direction of rotation of said disc armature, said phase shift circuit triggering a corresponding controlled rectifier of said power unit, a position indicator coupled to said stem, means coacting with said indicator to control said phase shift circuit in dependence upon the instantaneous position of said stem, a trigger circuit for each of said phase shift circuits, and an amplifier which amplifies the deviation or error of a process control means in interaction with a feedback circuit from each of said trigger circuits to control by pulse modulation the number of said individual pulses in said trains and the pause between said trains in dependence upon the instantaneous position of said stem.
Claim 10
Dependent Claim
175 words
Apparatus for the stepwise movement of a stem of a process control valve having a single seat which comprises a DC disc armature motor directly coupled to said stem, a power unit energizing said motor for clockwise and counterclockwise step movement with a series of trains of individual pulses obtained by controlled rectification from the AC mains, a phase shift circuit for each direction of rotation of said disc armature, said phase shift circuit triggering a corresponding controlled rectifier of said power unit, a position indicator coupled to said stem, means coacting with said indicator to control said phase shift circuit in dependence upon the instantaneous position of said stem, a trigger circuit for each of said phase shift circuits, and an amplifier which amplifies the deviation or error of a process control means in interaction with a feedback circuit from each of said trigger circuits to control by pulse modulation the number of said individual pulses in said trains and the pause between said trains in dependence upon the instantaneous position of said stem.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |