Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1992-10-26
1993-11-23
Ip, Paul
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318685, 318138, 318254, 318653, H02P 540, H02P 602
Patent
active
052647722
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a high-speed numerically controlled load actuating apparatus, more particularly to a numerically controlled load actuating apparatus which is preferably utilized for a motor which is required to quickly shift or move a load and stop at its stopping position with a high accuracy even in the case where the load is a heavy load such as one having a driving force of, for example, 10 kilogram weight-1000 kilogram weight.
BACKGROUND ART
Conventionally, a stepping motor for light loads has been well known. But, few cases are known as to the motors which have been practically used for providing a stepping motion to transfer a heavy weight at a high-speed.
Besides, there has been no means for realizing a numerical control in transferring a light load in a high speed condition.
A first problem for a heavy-duty stepping motor for numerically controlling a heavy load is that it tends to become large in size. This further poses the following problems.
(a) Due to its large inertia, it requires a considerably long time to finish one complete stepping motion. Thus, its rotational speed becomes so low that its utility is largely spoiled.
(b) Due to its large output torque, a large electric power is required for obtaining adequate acceleration and deceleration in each stepping motion. Thus, a large energy is consumed but also its efficiency is largely deteriorated to become a substantial drawback to its utility.
A second problem for a heavy-duty stepping motor is that it is required to shorten a stepping angle. However, if teeth are provided on magnetic poles for solving this problem, the rotational speed of the motor will be lowered, and thus an overall control time is too elongated for quick response.
Thus, it is an object of the present invention to provide a numerically controlled load actuating apparatus, which is capable of carrying out a numerical control of a load at a high speed and efficiently.
DISCLOSURE OF INVENTION
The present invention provides a numerically controlled load actuating apparatus, wherein a load is driven with a motor having n-phase (n=2, 3, 4, ---) full-wave salient poles or a magnet rotor; said numerically controlled load actuating apparatus comprising;
n-phase armature coils associated with n-phase magnetic poles of a fixed armature;
a current supply control circuit including said respective phase armature coils and a plurality of transistors;
diodes inversely connected in parallel with said respective transistors in said current supply control circuit for returning magnetic energies stored in respective armature coils to an electric power source when said armature coils are deactivated;
a DC electric power source for applying a voltage to said current supply control circuit;
2n pieces of back-flow preventing diode interposed in a forward direction with respect to a positive or a negative terminal of said DC electric power source;
a pulse distributor driven in response to outputs of an oscillator to generate stepping electric signals of n-phase full-wave current supply mode having a predetermined frequency;
small-capacitance capacitors disposed in parallel with said back-flow preventing diodes, respectively;
a position detecting device including a plurality of position detecting elements for detecting rotational positions of salient poles or magnetic poles on said magnet rotor so as to obtain position detecting signals of n-phase full-wave current supply mode;
a first electric circuit for obtaining an electric pulse row having a frequency corresponding to a frequency of said position detecting signals;
a second electric circuit for turning on said respective transistors in the current supply control circuit in response to said position detecting signals to let the DC motor generate a necessary torque;
a third electric circuit for turning on said respective transistors in the current supply control circuit in response to said stepping electric signals to let the stepping motor generate a necessary torque;
a first counter circuit for regist
REFERENCES:
patent: 4670696 (1987-06-01), Byrne et al.
patent: 4760320 (1988-07-01), Tsugita
patent: 4868478 (1989-09-01), Hedlund et al.
patent: 5043643 (1991-08-01), Hedlund et al.
patent: 5097191 (1992-03-01), Bahn
patent: 5111091 (1992-05-01), Bahn
patent: 5138244 (1992-08-01), Bahn
patent: 5144215 (1992-09-01), Bahn
patent: 5168190 (1992-12-01), Bahn
patent: 5194795 (1993-03-01), Bahn et al.
Ip Paul
Kabushikigaisha Sekogiken
LandOfFree
Numerically controlled load actuating apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Numerically controlled load actuating apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Numerically controlled load actuating apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1852045