CN2416663Y

CN2416663Y - Brushless electric machine micro high-speed sander

Info

Publication number: CN2416663Y
Application number: CN00222062U
Authority: CN
Inventors: 王明栋; 刘旭清
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-12
Filing date: 2000-01-12
Publication date: 2001-01-24
Anticipated expiration: 2010-01-12

Abstract

The utility model relates to a brushless electric machine micro high-speed sander, which is composed of an operating circuit which can ensure an electric machine to stably run at a high speed, an electric machine structure composed of a hall switch element, an electric machine circuit, wherein, the operating circuit is composed of a transform rectifying unit, a low voltage power supply switching unit, a current sampling control unit, an amplifying output unit and signal distribution speed feedback unit; the electric machine structure and the electric machine circuit are composed of hall element position sensors, stator windings, permanent magnet rotor bodies, low voltage power supplies and driving amplifiers. The utility model has the advantages of easy buy and low price of hall elements in the market, large force moment, high rotation speed, no interference of sparks, noe abrasion of carbon brushes, low noise and long service life.

Description

Brushless electric machine miniature high-speed sander

The utility model relates to a kind of electric tool, particularly a kind of oral medical operation, the employed Hall brushless motor of jewelry retrofit or the like miniature high-speed sander of being used for.

Existing miniature high-speed sander, as the high speed sander in Japan, Korea S and Taiwan, not only price is very expensive, wants 8000 yuan of one cover as Japan, 3000 yuans of Korea Ss, Taiwan is also wanted more than 2000 yuan.From keep in repair, technical also existing problems, the needed various accessories of above-mentioned sander are very expensive, and micromotor, it all is the motor of charged brush, promptly not only friction is big, rapid wear power consumption brush, needs often maintenance during use and changes carbon brush, not only uses inconvenient, and cost is very high, dallies over one's work the time.

See have the brush high speed sander number that must rub big technically, resistance is big, and rotating speed will be subjected to very big restriction, though import parts best be japanese product, maximum speed also is merely able to reach 30000 rev/mins.And noise is big, and the life-span is short, job insecurity.

The objective of the invention is to: disclose a kind of oral medical, jewelry and precision machined of being used for to the public, the brushless high speed direct-flow micromachine that adopts hall magnetic component to make is made, power is short big, noise is little, no spark signal disturbs, non-carbonate wearing and tearing and life-span are long, the brushless electric machine miniature high-speed sander of working stability.

The technical solution of the utility model is:

This brushless electric machine miniature high-speed sander is made of operating circuit that guarantees the steady running of motor high speed and electric machine structure and the motor circuit that is made of the Hall switch element.Operating circuit by 1., transformation rectification and filter unit, 2., switch and low-tension supply unit, 3., current sampling and control unit, 4., amplification and output unit, 5., signal allocation and speed feedback unit constitute.1. to 2. be unidirectional connection, 2. with 3. be two-way the connection, 2. to be unidirectional connection 4., 2. with 5. be two-way the connection, 4. with 5. be two-way the connection.Motor position sensor (the H that electric machine structure and motor circuit are made of locking-typed Hall switch element _1-2), stator winding (W _1-4), p-m rotor body (N-S), low-tension supply (IC) and driving amplifier (F _1-4) form.

Position transducer is made of two locking-typed Hall switch elements.These two Hall elements are mutually an angle of 90 degrees degree and distribute around rotor S-N, be fixed together with stator winding.

Stator winding is four groups of (W _1-4), four groups of stator winding evenly distributions of 90 degree each other around rotor S-N, four groups of stator winding (W _1-4) every group of parallel connection be connected with amplification and output unit, the other end is respectively by No. four drive circuit V ₁, V ₂, V ₃, V ₄Be connected with current sampling and control unit.Two Hall element sensitive surface are in the face of rotor S-N, and other end circuit is in parallel to be connected with the speed feedback unit with output unit, signal allocation with, amplification.

Operation principle of the present utility model is:

The full four condition that closes and end of two Hall switch and No. four drive circuit V ₁, V ₂, V ₃, V ₄Corresponding, drive circuit amplifies hall signal and makes corresponding stator winding electrifying, thereby produces the rotor electromagnetic torque, and rotor is running just.When rotor rotates, the N pole field always affacts two Hall elements, produce a control signal in any angle, this signal is connected the amplifier tube of corresponding drive circuit, cause the moving stator winding of this pipe racks to produce leading N-S magnetic field by electricity, force the magnetic field opposite sex alignment of the S-N stator generation of rotor.Electromagnetic torque has just been arranged between rotor and the stator, and rotor just rotates.Motor speed increases with supply power voltage, and linear the increasing, rotating speed can increase to more than 50,000 commentaries on classics from hundreds of commentaries on classics.Contain speed in the electronic driver and detect link, also just produced rate signal voltage, this signal is controlled the size of principal voltage conversely, has so just realized speed stabilizing control.The set-point of change speed, motor just are stabilized in running under definite rotating speed.Be that rotating speed of motor signal voltage and given signal compare, the error signal control switching is adjusted the output voltage size automatically, and motor stabilizing is turned round on given rotating speed.

The utility model compared with prior art has following advantage:

1, Hall element is easily purchased on the market, and price is low.

2, this motor power output is big, and moment is big, the rotating speed height, and no electric spark disturbs, non-carbonate wearing and tearing, noise is low, and the life-span is long.

3, this motor adopts low-voltage power supply, has safe, easy to use in fact.

4, whole aircraft reliability height, cost is low, is easy to produce by batch.

5, during the electric motor starting and under the load situation about increasing the weight of, motor will be adjusted supply power voltage automatically, quicken under predetermined electric current or moment compensates automatically, guarantee to accelerate to normal operating conditions with the fastest speed,

Below will description of drawings and embodiment the utility model is described further:

Fig. 1 is the utility model working cell and circuit connection diagram thereof.

Fig. 2 is the dc motor structure schematic diagram of the utility model Hall switch element control.

Wherein: 1, stator body (containing two Hall switch elements); 2, p-m rotor body; 3, motor shaft; 4, motor casing; 5, bearing is two; 6, adjusting nut; 7, three-jaw chuck body; 8, lock nut; 9, motor bonnet; 10, polishing emery wheel or rubbing head; 11, nine core cables.

Embodiment

According to part processing figure require 1, stator body, 2, p-m rotor body, 3, motor shaft, 4, motor casing, 6, adjusting nut, 8, lock nut, 9, motor bonnet or the like processes, and outsourcing piece: two Hall switch elements, 5, two on bearing, 7, three-jaw chuck body, 10, polishing emery wheel or rubbing head, 11, nine core cables etc. are according to assembling and setting figure and technological requirement assembling and setting.

Two Hall switch elements are tightened be fixed on the stator body 1.

Nine core cables are sent into hall sensor signal in the electronic driver and are handled, and connect corresponding stator line packet generation electromagnetic torque in the motor then, make rotor accelerate to specified polishing rotating speed.

After sample processes,, become 20v low pressure constant current after the rectification of civil power 220v AC transformation, export corresponding direct voltage, amplify power controlling triode V through signal through variable PWM pulse width control through test _1-4Conducting, thereby make corresponding W _1-4Conducting, static each corresponding H of the rotor S-N utmost point among the figure ₁And H ₂, after assignment of logical, allow V ₃The Zhongdao drive signal, W ₃Produce the S pole field, this magnetic field will attract the N utmost point of rotor, repel the S utmost point, and this electromagnetic torque impels rotor to clockwise rotate 90 degree, after this H ₁, H ₂The signal that produces makes W again ₄Conducting, rotor turn 90 degrees again, is later on W ₁→ W ₂Energising successively, rotor is with regard to the continuous accelerated service of up time.

Under secret prerequisite, sample send attached dental hospital of Huaxi Medical Univ actual use, no matter be technical or price on, all considerably beyond external (comprising Korea S and Taiwan) imported product.

Claims

1, a kind of brushless electric machine miniature high-speed sander, be made of operating circuit that guarantees the steady running of motor high speed and electric machine structure and the motor circuit that is made of the Hall switch element, it is characterized in that the connection between the operating circuit is: 2. 1. the transformation rectification be unidirectional the connection with switch with the low-tension supply unit with filter unit; 4. 2. switch be unidirectional the connection with amplification with output unit with the low-tension supply unit; Switch and low-tension supply unit 2. with current sampling and control unit 3., 5. signal allocation be two-way the connection with the speed feedback unit; Amplify with output unit and 4. 5. be two-way the connection with the speed feedback unit with signal allocation.

2, brushless electric machine miniature high-speed sander according to claim 1, it is characterized in that: described electric machine structure and motor circuit are connected to form by Hall element position transducer and stator winding, p-m rotor body and the amplifying circuit that two locking-typed Hall switch elements are constituted; Two Hall elements are mutually an angle of 90 degrees degree and distribute around rotor S-N, be fixed together with stator winding.

3, brushless electric machine miniature high-speed sander according to claim 1, it is characterized in that: stator winding is four groups, in peritrochanteric evenly distribution of 90 degree each other, 4. every group of parallel connection of four groups of stator winding be connected with amplification and output unit, and 3. the other end is connected with current sampling and control unit by No. four drive circuits respectively.

4, brushless electric machine miniature high-speed sander according to claim 1 is characterized in that: two Hall element sensitive surface are in the face of rotor S-N, other end circuit in parallel with amplification and output unit 4., 5. signal allocation be connected with the speed feedback unit.