Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Mechanically coupled in fixed ratio of movement
Patent
1996-11-26
1998-09-08
Ip, Paul
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Mechanically coupled in fixed ratio of movement
318 37, 318102, 318119, 318128, 310 36, 310 37, H02K 3300
Patent
active
058049339
DESCRIPTION:
BRIEF SUMMARY
This is application is a 371 of PCT/SE95/00613 filed on May 30, 1995.
TECHNICAL FIELD
The present invention relates to a method of operating at least one adjusting/positioning apparatus for an adjustable device, means of operating an adjustable device and an application of the said means.
STATE OF THE ART
The use of rapid pulses to drive a motor shaft through an electromagnetically vibrated (oscillating) arm mounted on the shaft has long been known. The shaft may be driven reversibly by an arrangement of two electromagnetically vibrated arms (see U.S. Pat. No. 1,860,492 and DE-C-349 678).
The use of a ratchet connected to a solenoid or electromagnet energized by an alternating current as a stepping drive for a disc device is also known (see U.S. Pat. No. 3,530,346 and CH-C-469 393).
The control of a feeder for handling vibrating material is known from U.S. Pat. No. 4,554,490. An optimum speed for conveying material so as to improve the feeding efficiency, reduce noise levels and reduce mechanical wear and tear on the equipment can be achieved by varying strokes and driving frequencies.
A disadvantage of known devices which use pulse-controlled electromagnets is that they use rapid oscillating pulses, a method which is not always suitable for operating adjustable devices, in addition to which the pulse length, frequency and amplitude cannot be varied at different times and at different positions of adjustment.
SUMMARY OF INVENTION
The present invention relates to a method and means of using at least one tool to operate an adjusting/positioning apparatus for an adjustable device, the tool being actuated mechanically by a moving element interacting magnetically with an electromagnet.
The electromagnet is energized by current pulses controlled by a computer program, the moving element actuating the tool operating adjusting/positioning apparatus in response to the current pulses in order to operate the adjustable device in accordance with the computer program. Several tools may be connected to the adjusting/positioning apparatus separately and/or in series and/or in parallel to operate the adjusting/positioning apparatus in one or the other direction at the specified torque/operating speed for different directions of operation and/or at different positions of adjustment.
The mutually dependent or independent current pulses for the electromagnets in question may be of a fixed or variable frequency, and the moving elements in question may be controlled to assume air gaps of different sizes with respect to the electromagnet under the control of the computer program.
In one embodiment of the invention, the adjusting apparatus consists of a threaded shaft provided with a fastener, such as a nut, to secure the adjusting apparatus to the adjustable device. The tool for operating the adjustable device may consist of an actuating/ratchet device.
The invention relates particularly to the use of the means of operating or positioning one or more adjustable devices in a vehicle, preferably using a single computer to control all of the magnetizing pulses.
Other special features and characteristics are described in the appended patent claims.
The invention is particularly applicable as a small, powerful, slow-acting motor, such as a linear motor, angle motor, stepping motor or suchlike, or as an actuator for operating and adjusting a device, such as turning a shaft, in instances in which solenoids are too fast-acting.
An advantage of the method and means in accordance with the invention, compared with other known adjusting devices, is the wide range of adjustment facilities, in terms of torque and speed of operation, available for different directions of operation, as well as for different adjustment times and positions. This is due to the computer control of the induced magnetizations of the electromagnets, which are determined by several parameters, such as current pulse frequency, pulse amplitude and pulse length, and by the nature of the mutual dependency between the magnetization pulses.
Another advantage is the
REFERENCES:
patent: 1860492 (1932-05-01), Butler
patent: 3530346 (1970-09-01), Mariani
patent: 4554490 (1985-11-01), Scott
Ip Paul
SEM AB
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