GB2069768A - An electrical motor - Google Patents

Abstract

A DC motor comprises at least one disk stator (10) carrying an array of DC electromagnets (12) and confronting at least one disk rotor (20) carrying an array of permanent magnets (22). When the electromagnets are energised the stator and the rotor have like poles at the same radial positions, thus providing a repulsion force. The electromagnets are intermittently energized through a switching means as soon as the attraction forces of both magnetic fields are at maximum and then de-energized as the repulsion forces of both fields are at minimum so as to enable said rotor (20) to maintain continuous rotation. <IMAGE>

Description

SPECIFICATION An electrical motor The present invention relates generally to an electrical motor, and more particularly to a novel DC motor device comprising at least one disk stator of a DC electromagnet assembly and at least one disk rotor of a permanent magnet assembly wherein a plurality of disk stators and disk rotors are coaxially and alternately arranged, and the electromagnet assembly is intermittently energized through a switching means as soon as the attraction force of both magnetic fields is going to be maximum and then de-energized as the expellation force to be minimum so as to enable said rotor producing a rotating motion.

At present the energy sources will be soon depleted and the energy crisis is increasingly serious day by day; all countries in the world are endeavouring to research and develop to find new energy sources or energy-saving machineries, while prime movers are particularly the mother of industry, and a majority of energy is consumed in them. The conventional engines not only consume large quantities, but also pollute the atmosphere, resulting in a serious public hazard. Hence, it would be very valuable to provide a driving device which has no waste gases to pollute the atmosphere. Further, although the conventional driving device using electric motor does not pollute the atmosphere, it requires a continuous power supply to keep it in operation, consuming a lot of power.Therefore, the provision of a new driving device saving power and having no air pollution problems will certainly be invaluable and have an epoch significance.

Accordingly, the primary objective of the present invention is to improve several shortcomings of conventional driving devices mentioned above and to provide a novel motor device utilizing the corelated action force of magnetic field's attraction and expellation, producing from a DC electromagnet assembly of a stator and a permanent magnet assembly of a rotor.

Another objective of the present invention is to provide a power-saving driving device incorporating a DC electromagnet and permanent magnetic field with a very powerful driving force.

These and other objects of the present invention will become more apparent from the ensuing disclosure and appended claims.

Fig. 1 is a sectional view of the first preferred embodiment of the DC motor device in accordance with the present invention; Fig. 2 is a sectional side view of Fig. 1, taken on lines I-I, showing a radial arrangement of a plurality of permanent magnet sets in the disk type of rotor in accordance with the present invention; Fig. 3 is a sectional side view of Fig. 1, taken on lines ll-ll, showing a radial arrangement of a plurality of electromagnet sets in the disk type of stator in accordance with the present invention; Fig. 4 is the wiring diagram in accordance with the present invention; Fig. 5 is a sectional view of the second preferred embodiment of the DC motor device in accordance with the present invention, wherein the electromagnet sets are of two-face type;; Fig. 6 is a sectional side view taken on lines Ill-Ill of Fig. 5; Fig. 7 is a sectional view of the third preferred embodiment of the DC motor device in accordance with the present invention, wherein the electromagnet sets and permanent magnet sets are of in the type of two-face, for simplicity, only showing two pairs of stator and rotor.

As shown in appended figures the DC motor device in accordance with the present invention is composed of components, i.e., stators 10, rotors 20, shaft 30, and switching means 40.

In Figs. 1 and 3, stators 10 are a plurality of electromagnets fixed on a circular disc 11 made of non-magnetic materials, in the center thereof is fitted with a bearing (not shown) and a shaft 30 is slip into the bearing. The stators 10 are secured by outer frame as conventionals (not shown), and as the shaft 30 rotates, owing to the security of the outer frame and the rolling of bearing nested in two end covers as conventionals, said stators 10 remain in fixed positions and do not move, while on the face of said stators 10 a plurality of electromagnet sets 12 are fixed at radially symmetrical positions, and in this embodiment there are 4 sets, said electromagnet sets 12 being composed respectively of several unit magnets, of course, each unit electromagnet 12 is composed of a core of ferro-silicon and winding, with two sets of unit electromagnet 12 connected in series, and then said six pairs terminals will be connected in parallel to their common junctions and further connected to the battery 60 through said switching means 40 and the main switch 50 (as shown in Fig. 4). Thus, after said main switch 50 is switched on and when said switching means 40 is make, the polarity of every unit electromagnet 12 is the same, that is, the S poles of all sets of unit electromagnet 12 are on the outer side and their N poles are on the inner side (of course, the N poles may be on the outer side and the S poles on the inner side).

It is to be understood that the switch means 40 in this embodiment is a type of limit switch, of course, any other forms of switching means can also be used, such as non-contacting switching means, for example, SCR, photo cell together with their control circuit.

As shown in Fig. 2, a shaft 30 is fitted onto the rotors 20 at the center of the circular disc 21 made of a non-magnetic material. An actuating means (not shown) is fixed at places where the unit permanent magnets have a maximum attraction to the electromagnet, making the switching means 40 "on" and energized, and effecting no energization during minimum expellation, so as to run against the switch means 40 to control the electromagnet sets 12 energized or not; while at the corresponding radial positions of said rotors 20 are fitted each four sets of permanent magnet 22 and each permanent magnet set 22 is composed of two sets of unit permanent magnet 22, their fixed positions being corresponding to the unit electromagnets 12.As for polarity, the S pole faces toward the S pole of the energized elec tromagnet set 12, and the N pole faces toward the N pole of the energized electromagnet set 12. Thus, when said electromagnet set 12 is not energized the core of electromagnet set 12 will be attracted by the permanent magnet set 22, and when said electromagnet set 12 is energized it will be expeiled by the permanent magnet set 22.

The shaft 30 passes through the whole stators 10 and rotors 20, but the rotor is secured onto the shaft 30 and the stator 10 is slip over the shaft 30 by means of a bearing, and the stators are secured with a frame (not shown). Thus the rotary force due to attraction and expellation of the stators 10 and rotors 20 can drive said rotors 20 and said shaft 30 to rotate and in turn drive other machineries. The number and the intervals of stators 10 and of rotors 20 on the shaft 30 can be determined according to practical requirements.

As the foregoing descriptions, the permanent magnet 22 and the electromagnet 12 are both arranged in the manner of face to face and both are radially positioned on one side thereof. However, said electromagnet sets 12 of said stator 10 may be further formed in the type of two-face as shown in Fig. 5, the second preferred embodiment of the present invention where both side of said electromagnet 12 are sandwiched by two disk rotors 20-20 and the rest components remain unchanged.

As shown in Fig. 7 is the third embodiment of the present invention in which two pairs of disk rotors and stators are combined together as one unit by an outerfranges 13 and 14, and both premanent magnet sets and electromagnet sets are all in the type of two-face construction which are enclosed by said permanent magnet sets. This construction will further increase the co-related action force of both magnetic field's attraction and expellation. It will be understood that for purpose of simplicity only two pairs of rotors and stators are shown, however, numerous rotors and stators may be further combined together depending on the practical requirements.

When assembled, the stators 10 and rotors 20 are placed alternately one by one, that is, the first piece is a stator 10 and the second piece is a rotor 20, and the third piece is a stator 10, and so on in succession; and the electromagnet sets 12 of the stators 10 are arranged with the N,S poles of the rotors 20 at positions as shown in the appended figures. Furthermore, the stators 10 are placed in fixed positions, whereas in the rotors 20, the permanent magnet set 22 on one piece differs from the permanent magnet set 22 on another piece in a certain angle in positioning, making the whole incorporated device possess attracting and expelling forces at the same time sequence, so that the rotation is uniform and smooth.

While I have described several embodiments and modifications of the present invention as above. It is apparent that certain changes, omissions and substitutions of the arrangement of electromagnet or permanent magnet on the stators or rators together with there fitting means and switching means of the present invention may be made therein without departing either from the spirit of the invention or the scope of the appended claims.

Claims (4)

1. A novel DC motor device comprising: A housing for accommodating at least one stator and at least one rotor and a shaft extending through the centers of both said stator and rotor; Said stator being a circular disk made of a nonmagnetic material having a bearing means at its center for movably supporting said shaft and a plurality of electromagnet sets being secured radially on at least one face thereof; Said rotor being a circular disk made of a nonmagnetic material having a fixing means at its center for rigidly fitting on said shaft and at least on one face of said disk rotor being fixed with a same number of permanent magnet sets at the corresponding positions to said stator;; A switching means being connected in series with a DC power supply and mounted at such a position that when said electromagnet and permanent magnet are in the position of maximum attraction, said electromagnet sets on said stators will be energized to produce a magnetic field with a same polarity of said permanent magnetic field on said rotor and will expel said rotor to rotate, and when said rotors rotating into a neutral position with respect to said stators, said electromagnet sets are de-energized by said switching means, and then the permanent magnet sets on said rotors attract said electromagnet sets on said stators; whereby the intermittent actions of attraction and expellation force the rotors to continue rotation.

2. A novel DC motor device according to clam 1, wherein said electromagnet sets are mounted on at least one face of said rotors, while said permanent magnet sets on at least one face of said stators.

3. A novel DC motor device according to claims 1-2, wherein a number of disk stators and rotors are alternately fixed on said shaft and said permanent magnet sets on each said rotor (or stator) are respectively placed at a predetermined angle differing each other from said corresponding electromagnet sets on said stator (or rotor).

4. A novel DC motor device substantially as hereinbefore described with reference to, and as illustrated in the accompanying drawings.