Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1980-01-17
1982-06-08
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318135, 417416, 128 1D, 310 37, G05B 1100
Patent
active
043341802
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application is based on German Patent Application Ser. No. P 2,823,802.0, filed in the Federal Republic of Germany on May 31, 1978 and on the corresponding application PCT/DE79/00053 filed on May 31, 1979. The priority of the original German filing date is claimed.
BACKGROUND OF THE INVENTION
The invention relates to a driving mechanism for oscillating displacement pumps. Such driving mechanisms are known from British Pat. No. 1,442,500. In these known driving mechanisms the time sequence of the volume flow and of the suction pressure as well as of the discharge pressure is determined by the geometry of the pole shoes and of the field configuration. Thus, among others, the flow speed is also determined.
When conveying media which can withstand only a certain reduced pressure or increased pressure without damage, it is necessary to reduce the driving speed of such pumps so that the occurring reduced or increased pressures do not exceed the permissible limit values. Thus, the mass flow is substantially reduced and the pump is insufficiently utilized. However, it is possible to reduce these difficulties by using volume storage means in the form of expansion chambers arranged upstream or downstream, whereby the entire pumping system becomes more involved and more expensive. Besides, by these features it is not excluded that the permissible reduced or increased pressures are exceeded anyway. Additionally, these features cause an increase in the volume of the medium being conveyed in the pump conveying system.
In connection with media to be conveyed which may not be exposed to certain maximum shearing stresses, it is necessary to keep the acceleration forces of the moving pump components so low that the limit value of the shearing stress is not exceeded at any points of the hydraulic system. This also reduces the degree of efficiency of the pump.
It is known in connection with positioning means for disc memories in the data processing art, which comprise electro-dynamic linear motors, to provide a control circuit which controls the positioning stroke in response to the difference between the actual value of the positioning displacement and the reference value of the desired position as well as in response to the positioning speed. However, in connection with such positioning means for disc memories used in the electronic data processing art, problems of quite a different type occur. Especially, it is essential that the desired reference position is reached precisely so that this known device could not provide any hints with regard to driving mechanisms for oscillating displacement pumps ("Feinwerketechnik and Mikronik", Vol. 77, Nr.4 1973, pages 151 to 157).
OBJECTS OF THE INVENTION
Thus, it is the object of the invention to construct the above mentioned driving mechanism in such a manner that on the one hand the permissible limit values for the reduced pressure, the increased pressure, the acceleration and so forth, are maintained with certainty while on the other hand the largest possible conveying capacity is achieved within the limit values.
SUMMARY OF THE INVENTION
The invention has achieved the above objectives in an electromagnetic drive mechanism for an oscillating displacement pump, including a stator and a runner which is guided by the stator and movable across the field lines of the stator, and further including a coupling device between the stator and the runner on the one hand, and between the stator and the displacement pump on the other hand, said stator comprising a permanent magnet system for producing the stator field and said runner comprising a runner winding which is characterized by a control circuit arrangement which comprises at least one first signal pick-up for providing a signal representing the actual or measured value of a stroke parameter by at least one reference second pick-up for providing a signal representing a reference value of a stroke parameter, by at least one comparator operatively connected with its two inputs
REFERENCES:
patent: 2483895 (1949-10-01), Fisher
patent: 3737883 (1973-06-01), Sordello et al.
patent: 4078198 (1978-03-01), Murakosi
patent: 4122379 (1978-10-01), Richter
patent: 4220899 (1980-09-01), von der Heide
"Design Notes", Control and Instrumentation, Sep. 1977, vol. 9, No. 8, 318-135.
"Design Notes", Control and Instrumentation, Sep. 1977, vol. 9, No. 8, 318-135.
E & M; Elektrotechnik und Maschinenbau; by O. Roubicek "Die Uebertragungseigenschaften des Niederfrequenzsynchronlinearmotors", Jan. 1973; pp. 23 to 29.
Bramm Guenter
Novak Pavel
Dobeck B.
Fasse W. G.
Gould D. F.
Speidel & Keller GmbH & Co. KG
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