US3809986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positioning device
Assignee: US Philips Corp
•
Filing: 1973-02-15
•
Granted: 1974-05-07
•
Expires: 1993-02-15
Abstract
Abstract A positioning device is subjected to an acceleration during the first part of a step, whilst it is subjected to a deceleration during the second part. The tolerance in the maximum obtainable deceleration is not negligibly small. Therefore, the second part of the step is divided into three phases. In the first phase a standard deceleration is used which is less than the maximum deceleration; in the second phase the deceleration is maximum; in the third phase positional control is effected.
Inventors
- 👤 W Visser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526; G11B5/553; G11B5/5547; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/23; G05B19/231; G05B19/232
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
131 words
A method of positioning a load from a first position to a second position by means of a motor which can reach a given maximum acceleration and a maximum deceleration which comprises, driving the motor towards the second position with an acceleration step and a multi-phase deceleration step, the acceleration being at the maximum acceleration during the acceleration step and the deceleration being constant during a first phase of the deceleration step at a standard value below said maximum deceleration, at a given distance from said second position starting a second phase of the deceleration step in which the motor is driven with said maximum deceleration, and driving the motor under positional control during the last phase of the deceleration step to bring the load to rest at the second position.
Claim 2
Independent Claim
131 words
A method of positioning a load from a first position to a second position by means of a motor which can reach a given maximum acceleration and a maximum deceleration which comprises, driving the motor towards the second position with an acceleration step and a multi-phase deceleration step, the acceleration being at the maximum acceleration during the acceleration step and the deceleration being constant during a first phase of the deceleration step at a standard value below said maximum deceleration, at a given distance from said second position starting a second phase of the deceleration step in which the motor is driven with said maximum deceleration, and driving the motor under positional control during the last phase of the deceleration step to bring the load to rest at the second position.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1, characterized in that the second phase is terminated and the last phase begun at a given second distance from said second position.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, characterized in that the second phase is terminated when the motor reaches a given minimum velocity.
Claim 5
Dependent Claim
26 words
A method aS claimed in claim 1, characterized in that a step with uniform displacement velocity is provided between the acceleration step and the deceleration step.
Claim 6
Independent Claim
211 words
A device for positioning a load from a first position to a second position comprising, a motor coupled to the load and a servo control generator connected thereto and by means of which the motor can be driven from said first position to said second position in an acceleration step and a multi-phase deceleration step, the motor being capable of reaching a maximum acceleration and a maximum deceleration, the servo generator having means for deriving an acceleration signal and at least two further signals, means for applying said acceleration signal to the motor to produce said maximum acceleration, a first of the two further signals being a standard deceleration signal which will drive the motor at a deceleration less than said maximum deceleration, means responsive to the last of said two further signals for activating a positional control device coupled to the motor, means responsive to the motor for deriving a deviation signal indicating the distance to the second position, means for applying the deviation signal to the servo generator which in response thereto generates an intermediate signal between the first and the last signals of a value to produce said maximum motor deceleration, and means for applying said maximum deceleration signal to the motor between the first and last signals.
Claim 7
Independent Claim
211 words
A device for positioning a load from a first position to a second position comprising, a motor coupled to the load and a servo control generator connected thereto and by means of which the motor can be driven from said first position to said second position in an acceleration step and a multi-phase deceleration step, the motor being capable of reaching a maximum acceleration and a maximum deceleration, the servo generator having means for deriving an acceleration signal and at least two further signals, means for applying said acceleration signal to the motor to produce said maximum acceleration, a first of the two further signals being a standard deceleration signal which will drive the motor at a deceleration less than said maximum deceleration, means responsive to the last of said two further signals for activating a positional control device coupled to the motor, means responsive to the motor for deriving a deviation signal indicating the distance to the second position, means for applying the deviation signal to the servo generator which in response thereto generates an intermediate signal between the first and the last signals of a value to produce said maximum motor deceleration, and means for applying said maximum deceleration signal to the motor between the first and last signals.
Claim 8
Dependent Claim
33 words
A device as claimed in claim 5, characterized in that the servo generator can be switched through from said second position under the control of a second deviation signal from a deviation detector.
Claim 9
Dependent Claim
32 words
A device as claimed in claim 5, characterized in that the servo generator can be switched through from said second position under the control of a velocity signal from a velocity detector.
Claim 10
Dependent Claim
57 words
A device as claimed in claim 5 characterized in that said servo generator further comprises means for generating an additional signal between the acceleration signal and said first standard deceleration signal and of a value to produce uniform motor speed, and means for applying the additional signal to the motor to drive same at said uniform speed.
Claim 11
Independent Claim
244 words
A system for positioning a load between first and second positions comprising, a motor coupled to the load, a motor control unit for controlling the acceleration and deceleration of the motor to provide an acceleration step and a multi-phase deceleration step, means for sensing the motor position and providing control signals indicative thereof, a positional control system controlled by said control signal, means for supplying to said motor control unit a signal representative of the distance the load must travel between said first and second points, means for applying said control signals to said motor control unit, said control unit including means for generating an acceleration signal of a value to drive the motor at maximum acceleration and first and second deceleration signals in the order named, said first deceleration signal being of a value to drive the motor at a fixed deceleration value less than the maximum motor deceleration during a first deceleration phase and the second deceleration signal being of a second value to drive the motor at its maximum deceleration during a second deceleration phase of the deceleration step, said motor control unit being responsive to said control signals to switch over from the generation of said first deceleration signal to said second deceleration signal at a given deviation of the motor from said second position, and means controlled by said control unit for selectively coupling said positional control system to the motor during the last phase of the deceleration step.
Claim 12
Independent Claim
244 words
A system for positioning a load between first and second positions comprising, a motor coupled to the load, a motor control unit for controlling the acceleration and deceleration of the motor to provide an acceleration step and a multi-phase deceleration step, means for sensing the motor position and providing control signals indicative thereof, a positional control system controlled by said control signal, means for supplying to said motor control unit a signal representative of the distance the load must travel between said first and second points, means for applying said control signals to said motor control unit, said control unit including means for generating an acceleration signal of a value to drive the motor at maximum acceleration and first and second deceleration signals in the order named, said first deceleration signal being of a value to drive the motor at a fixed deceleration value less than the maximum motor deceleration during a first deceleration phase and the second deceleration signal being of a second value to drive the motor at its maximum deceleration during a second deceleration phase of the deceleration step, said motor control unit being responsive to said control signals to switch over from the generation of said first deceleration signal to said second deceleration signal at a given deviation of the motor from said second position, and means controlled by said control unit for selectively coupling said positional control system to the motor during the last phase of the deceleration step.
Claim 13
Dependent Claim
56 words
A system as claimed in claim 9 further comprising means for sensing the motor speed and providing a velocity signal proportional thereto, said motor control unit including means responsive to said velocity signal for terminating the second phase of the deceleration step and initiating the last phase thereof at a given minimum speed of the motor.
Claim 14
Dependent Claim
48 words
A system as claimed in claim 9 wherein said motor control unit includes means responsive to the position control signals for terminating the second phase of the deceleration step and initiating the last phase thereof at a second given deviation distance of the motor from said second position.
Claim 15
Dependent Claim
125 words
A system as claimed in claim 9 further comprising means for sensing the motor speed and providing a velocity signal proportional thereto, and wherein said motor control unit includes a difference register to which is applied said signal representative of the load travel distance and a sequence of counting pulses from said motor position sensing means, a digital-to-analog converter for converting the register count to an analog signal, a function generator controlled by said analog signal to generate a second velocity signal that varies with the register count, a subtractor unit, means for applying the first and second velocity signals to said subtractor, said subtractor supplying a drive signal to the motor that is proportional to the difference between said first and second velocity signals.
References Cited (Backward Citations)
US3482155A
Cited
US3629560A
Cited
US3668494A
Cited
US3729668A
Cited
US3699555A
Cited
US3731177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |