Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Mechanically coupled in fixed ratio of movement
Patent
1986-09-11
1989-01-17
Ro, Bentsu
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Mechanically coupled in fixed ratio of movement
318 41, H02P 768
Patent
active
047989998
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a numerically controlled electromechanical precision drive system in which driven shafts of electromotors, provided with their own power supply, have pinions meshing with a middle gear arranged in a common housing (16), the middle gear having a spindle (20), for the parts to be driven, arranged parallel to the motor shafts, and wherein the control pulses are determined by parameters associated with the parts to be driven.
From the DE-OS No. 33 45 528 a method is known for controlling motor-driven high-pressure valves where the control of the motion of the valve regulating rod is controlled automatically and fully electronically in dependence on continuously performed and continuously indicated results of parameters such as pressure, temperature, position of the valve cone and such. With a device for carrying out this method, merely a single regulating motor is provided for the valve regulating rod. This results in the unit having to be shut down if the motor fails.
From the DE-OS No. 29 52 695 a method and a set-up is known for the control, monitoring and consumption measurement of a fluid flow valve where the signal for the control of the position of the valve body is used for measuring the fluid flow-through volume of the valve. Here also only a single step-motor is provided.
Hitherto designed electromechanical drive systems are, due to the mass inertia, relatively slow and not very dynamic. Their start-up is difficult and they cannot be driven with sufficient precision. It has been shown that with the known valve controls, the versatile demands made particularly by the measurement and control engineering fields on large and heavy electromechanical drives cannot be fulfilled.
SUMMARY AND OBJECTS OF THE INVENTION
In contrast to this, the invention is based on forming a numerically controlled electromechanical precision drive system of the initially mentioned type in such a way that with low power consumption, high-speed, sure and efficient drives are obtained which can also move heavy components with high precision in a large torque range and over the smallest of measured lengths, both in rotational operation and in translational operation as well as in combined rotational/translational operation. This task is fulfilled according to the invention with an electromechanical precision drive system of the type aforenoted, in which a large number of almost inertia-free light-current servomotors synchronously controlled independently of each other by means of a drive electronics with emergency power unit has small individual torques, and that the pinions on each servomotor are provided as planetary gears and the middle gear as a sun gear with relatively small toothing and wherein the sum of the individual torques combining in the spindle of the sun gear whereby a multi-torque drive occurs which effects a rotational and/or a translational motion of the spindle.
In this manner an electromechanical drive system is provided with an extremely good proportion of torque and pushing and pulling force to the drive volume, this having the following advantages: reproducibility,
The following fields of application are of particular interest: all types of valve controls, especially in those cases where precise settings of valves are required, here therefore in particular in chemical processing engineering, in aviation, space operations as well as in nuclear technology, precision drives in general mechanical engineering, e.g. for precision advance with all sorts of translational movements such as traversing, or in the field of CNC machines, with robots and manipulators, also in safety-relevant plants such as drives of reactor control means, and especially where maximum operational reliability is required and where in the event of a power failure the drives are to function perfectly.
Further novel features and other objects of this invention will become apparent from the following detailed description, discussion and the appended claims taken in conjunction with the accompanying drawings.
BRIEF
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