GB2220281A

GB2220281A - A motor with torque control

Info

Publication number: GB2220281A
Application number: GB8814281A
Authority: GB
Inventors: Yao-Yu Wu
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-04-20
Filing date: 1988-06-16
Publication date: 1990-01-04
Also published as: DE3813226A1; GB8814281D0

Description

-1 2220281 TITLE: A MOTOR WITH AN AUTO OUTPUT ADJUSTING DEVICE

BACKGROUND OF THE INVENTION

So far, the maximum output of a motor used in a machine such as a shaper, a press, a cutter, a roller... etc. should be decided according to the maximum work load of the machine driven by the motor. Therefore, when the machine works idle or with a light load, the motor still revolves nerely at its high output, which makes up the waste of electric power.

This invention has been worked out in order to reduce as much as possible the waste of electric power used in the motor driving such a machine as mentioned above.

1 1 10 SUMMARY OF THE INVENTION

This invention relates to a motor with an auto output adjusting device.

It is the primary object of the present invention to provide a motor with an auto ouptut adjusting device which has a torque sensor that can sense the torque required to transmit to a secondary shaft by a main shaft.

It is another object of the present invention to provide a motor with an auto output adjusting device which can economize electric power consumption.

It is still another object of the present invention to provide a motor with an auto output adjusting device which is precise in construction.

2 BRIEF DESCRIPTIUON OF THE DRAWINGS FIG. I is an explosive perspective view of the first example of the motor with an output adjusting device in this invention; FIG. 2 is a cross-section view of the first example of the motor in this invention; FIG. 3 is the diagram of the electric circuit used in this invention; FIG. 3-1 is the diagram of the circuit of the stator independent coils in this invention; FIG. 4 is the diagram of the circuit of the resistances in this circuit; FIG. 5 is the diagram of the controlling circuit for the resistances in this invention; FIG-6 is the diagram of the example of the photoelectric controlling circuit in this invention; FIG. 7 is the diagram of the second example of the photoelectric controlling circuit of this invention; FIG. 8 is a view of the static interrelated position of the main and the secondary gear discs in this invention; FIG. 9 is a view of the static interrelated position of the protrusion, the active rod, the ring shutter and the photoelectric switch in this invention; 3 FIG. 10 is a view of the kinetic interrelated position of the main and the secondary gear discs in this invention; and FIG. 11 is a view of the kinetic interrelated position of the protrusion, the active rod, the ring shutter and the photoelectric switch in this invention.

4 DETAILED DESCRIPTION OF THE INVENTION

4 As in FIG. 1 and 2 show, a stator 1 has five independent coils 11, 12, 13, 14, 15 wind around the same core, a rotor 2 includes a main shaft 21 and a secondary shaft 22 fixed at the transmitting end of the main shaft 21, a torque sensor 3 is connected between the main shaft 21 and the secondary shaft 22, and a fly wheel 4 is set at the untransmitting end of the main shaft 21.

The other kind of structure of stator 1 and rotor 2, as FIG. 2-1 shows, can be made up of independent coils 11, 12, 13, 14 and 15, divided to have their seperate parts of rotor 2 to drive, in other words, each coil having its own parts of rotor 2 for driving, this structure also has the same effect as the first mentioned above does.

The torque sensor 3 includes main gear disc 31 fixed on main shaft 21 and secondary shaft 22 fixed on secondary shaft 22 set facing and engaging with each other with gears 311 of the main gear disc 31 engaging with gear 321 of secondary gear disc 32 plus spring 33 set between both gears 311, 312 as FIG. 8 shows. On the peripheral surface of main gear disc 31 are set protrusions 312 and the protrusion side against 1 5 secondary gear disc 32 forms spherical inclined surface 313 as FIG. 1 shows. On the peripheral surface of secondary gear disc 32 are set supporters 322 with holes 323 bored in the center, and active rods 35 are set penetrating through said holes 23 and covered around by spring 34. Active rods have their one end touching the inclined surface of protrusions 312 and the other end fixed with ring 36 after penetrating through holes 323 of supporters 322. Ring 36 and the inside edge of motor cap 30 are respectively set with ring shutters 37 and photoelectric switches 38 facing each other.

The electric circuit for adjusting the output of the motor in this invention is shown in FIG. 3, 3-1.

The first independent stator coil 11 ig directly turned on/off by the power switch, while the independent stator coils 12, 13, 14 and 15 of the 2nd to the 5th ones controlled by the photoelectric switches 38; under normal condition, said active rods 35 touch the highest point of the inclined surface 313 of protrusions 312 as shown in FIG. 9, forcing ring shutters 37 fall into the nortch of the photoelectric switches 38 to cut off said switches 38.

A variable resistance 5 shown in FIG. 3 and 4, is set for restricting the starting current for a motor of high capacity or high horse power but unnecessary for a 6 motor of low capacity.

To start this motor when the machine is-silent, first move switch C to the auto Position and then turn power switch F on, making magnetic switches M6, M7, M8 and M9 on, switch S commands magnetic switches M1, M2, M3, M4 and M5 to activate, with the normally open of the magnetic-switch M1 closed, the stator independent coils 11, 12, 13, 14 and 15 will be charged to drive rotor 2..

The revolution detector E set on the main shaft 21 of the motor shown in FIG. 1, 2 and 5 has generating ability. The starting current of the motor has to pass resistances AR1, AR2, AR3, AR4 and AR5 for being restricted its current as shown in FIG. 4; as the speed of the motor is increasing, transistors Q1, Q2, Q3, Q4 and Q5 orderly become on activating relays al, a2, a3, a4 and a5 and magnetic switches Al, A2, A3, A4 and A5 to turn on orderly, and then resistances AR1, AR2, AR3, AR4 and AR5 can get shortcircuited orderly. The starting operation of the motor will have been finished at the moment when magnetic switch A5 begins to work on, all resistances ARI, AR2, AR3, AR4 and AR5 will have been cut off, and magnetic switches Al, A2, A3 and A4 will be made to open.

Upon sensing the revolution of the rotor of the motor has reached a predetermined value, which means A5 7 is actuated, the revolution detector E will close the relay D1 to cut off the magnetic switches M6, M7, M8 and M9.

After the motor has been started, gears 311 of the main gear disc 31 press against the springs 33 as shown in FIG. 10 in transmitting the revolution to secondary shaft 22. Then the distance of the springs 33 contracted by gears 311 are just tantamount to the distance of the protrusion 312 moved; the moving of the protrusions 312 causes active rods 35 to move their touching point on inclined surfaces 313 from high to low as shown in FIG. 11 and then ring shutters 37 are to be made to retreat lstting the light given off by the LED pass through closing photoelectric switches 38, which sent a signal for commanding transistors Q6, Q7, Q8, Q9 to drive relays D2, D3, D4 or D5 on. So it can be understood that once the motor is started, magnetic switches M10, M11, M12, M13 form another circuit for separately supplying stator independent coils 12, 13, 14, 15 with electricity.

Therefore, if the working load of the machine still exceeds the output of the stator independent coil 11 after the closing of relay D1, another group of magnetic switches already in the closed state M10, M11, M12 or M13 will retain at least one closed circuit of 8 stator independent coils 12, 13, 14, or 15 according to the work load.

Photoelectric switches 38 shown in FIG. 3 with the aid of the variable resistances VR1, VR2, VR3, VR4 controls individually relays D2, D3, D4 and D5 to be closed or opened in accordance with the amount of light received from the LED. The equivqlent circuit shown in FIG. 7 represents that four photoelectric switches set for individually controlling relays D2, D3, D4 and D5 are located all differently from one another in the distance from ring shutters 37, and the sequential order in which ring shutters 37 move in four photoelectric switches decides the turning-on or turning-off o said relays D2, D3, D4 and D5.

Magnetic switches M2, M3, M4 and M5 are established for separating the phase coil of each stator independent coil lest those stator independent coils still not supplied with electricity should produce electromotive force during the working state of the motor.

The electric circuit used in this invention shown in FIG. 3 also includes a manual operation means in which switch C can be moved to the manual operation point first, and then switches HS can be optionally closed to turn on the stator independent coils needed in 9 working the motor.

As the above description shows, this invention can be at any time adjusted in the output of the motor in accordance with the load the machine is receiving by means of changing the number of the stator independent coils needed-to get electricity. Therefore, the operational current used in the motor during the idle or light working load of the machine is far less than used in a conventional motor which always drives its machine 10 with the maximum capacity.

Claims

I CLAIM:

1. A motor with an auto output adjusting device comprises a stator and a rotor, said stator having a.plurality of independent coils with s.eparate contact points able to drive individually the rotor by-only-one or more of said-independent coils operated manually or automatically by an- electric circuit;

2.The motor with an auto output adjusting device as claimed in claim 1, wherein the revolving shaft of the rotor in the motor includes a main shaft and a secondary shaft set at the transmitting end of said main shaft, a torque sensor is connected between the main and the secondary shaft for sensing the torque the main shaft has to transmit to thesecondary-in order'that the stator independent coils needed to cope with the load of the-maizhine-can get electricity by means of the electric circuit, and a fly wheel for inertia is s-et at the untransmitting end of the motor; The motor with an auto output adjusting device as claimed in claim 2, wherein said torque 11 4.

1 sensor comprises a main and a secondary gear discs facing and engaging with each other, the main gear disc is fixed on the main shaft while the secondary gear disc on the secondary shaft, several curved gears are set protruding longitudinally on both the main and the secondary gear discs, a spring is set between each gear of the main gear disc and each gear of the secondary gear disc, on the peripheral surface of the main gear disc are set protrusions with an inclined surface facing the secondary gear disc, on the peripheral surface of the secondary gear disc are set supporters with a hole at its center, an active rod covered by a spring is set with one end touching the inclined surface of the protrusions of the main gear disc with the other end penetrating through the hole of the supporter of the secondary gear disc being fixed with a ring, said ring and the motor cap separately have ring shutters and photoelectric switches set opposite to each other, the distance between each gear of the main gear disc and each gear of the secondary gear disc can be automatelly changed by the 12 1 spring between both said gears of the main and the secondary gear disc correctly corresponding to contract or lengthening according to the machine load, and then the protrusions of the main gear disc are. sychroneously moved to push or release the active rods, which then move the ring shutters out or in the photoelectric switches to close or open said switches that command the turning-on turning-off of the stator independent coils; 4. The motor with an auto output adjusting device as claimed in claim 1, wherein the rotor independent coils are set on the same core but on a separate layer each; 5. The motor with an auto output adjusting devic as claimed in claim 1, wherein the stator independent coils are set on the same core but on a separate section each.

13 Published 1989 atThe Patent Office, State House, 56/71 HighHolborn, London WCIR4TP. Further copiesmaybe obtained from The Patent Office. Sales Branch, St Mary Cray, Orpington, Kent ERS 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con. 1/87