CN101488696A

CN101488696A - Brushless vibrating motor

Info

Publication number: CN101488696A
Application number: CNA200810218350XA
Authority: CN
Inventors: 董乐平
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd; AAC Acoustic Technologies Changzhou Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd; AAC Technologies Holdings Changzhou Co Ltd
Priority date: 2008-12-12
Filing date: 2008-12-12
Publication date: 2009-07-22

Abstract

A brushless vibrating motor mainly comprises a base, an upper cover and a rotating shaft supporting on the base and the upper cover; wherein, the base is provided with a circuit board which is distributed with a first coil and a second coil, a starting coil positioned between the first coil and the second coil, and a control chip that is provided with a hall element; the first coil and the second coil are connected with two pins of the control chip in series, and are communicated with a power end; one end of the starting coil is connected with the power end, and the other end is connected with another pin of the control chip, and one of the pins of the control chip is earthing; the pin which is earthing is not conducted with the motor connected at another pin of the starting coil when in the process of normal starting or running.

Description

Brushless vibrating dynamo

[technical field]

The present invention relates to a kind of vibrating motor, relate in particular to a kind of brushless vibrating dynamo that is used on the portable consumer electronic product.

[background technology]

The portable consumer electronic product, as mobile phone, handheld device, guider or palm multimedia entertainment equipment etc., generally can use vibrating motor and do system feedback, such as the incoming call prompting of mobile phone, vibrational feedback of game machine or the like, wherein used motor mainly contains column motor unshakable in one's determination, drag cup motor and flat electric machine several types.According to the used current characteristics of motor, can be divided into direct current machine and alternating current machine etc. again, and direct current machine is divided into brush direct current machine and brshless DC motor two classes is arranged, so-called here " brush " is the brush that cooperates with commutator.Dc brushless motor has identical operation principle with general direct current machine, but it constitutes difference.

Brushless electric machine has the advantage of low noise, no electromagnetic interference and stable performance because removed brush and the commutator that mutual friction energy causes the generation powder of cremating.Brshless DC motor drives and controls motor rotation by built-in circuit, for this low-power machine of vibrating motor, integrated detection rotor-position and the drive controlling single application-specific integrated circuit (ASIC) (ASIC) in one has appearred on the market, this integrated circuit generally has Hall element, Hall element utilizes Hall effect work, so-called Hall effect when being meant the charge carrier of the action of a magnetic field in current-carrying metallic conductor, semiconductor, produces the physical phenomenon of transverse electric potential difference.Therefore, can utilize Hall element detect magnetic field with and intensity, on brushless electric machine, then can be used to detect changes of magnetic field and be used for the sense of current in the control coil.

Brushless electric machine comprises rotor and stator, rotor constitutes by belt multistage magnet is installed on the eccentric pallet usually, in order further to improve the vibration force of rotor, can increase a balancing weight that proportion is higher than iron therein, stationary part then comprises the control chip of deflecting coil and band Hall element, if when motor stays cool, deflecting coil is to be in to stimulate transition region or Hall element to be in no field region, and motor can't start.

In order to address the above problem, a kind of technical scheme has occurred.Please join Fig. 1 and Fig. 2, a kind of brushless vibrating dynamo 90, it comprises base 91, loam cake 92, is supported on the rotating shaft 93 between base 91 and the loam cake 92, circuit board 94 is set on the base 91, circuit board 94 is provided with the first coil 95a and the second coil 95b and the actuating coil 95c between the first coil 95a and the second coil 95b, also be provided with control chip 99 on circuit board 94, control chip 99 has Hall element 99a, and circuit board 94 and each element that is provided with are above formed stator.

Relative with stator, be provided with rotor rotated around the shaft, this rotor comprises substrate 96, be fixed on the magnet 97 on the substrate 96 and be fixed on weighting block 98 on the substrate 96.Please join Fig. 3, magnet 97 is circular, is provided with spaced magnetic pole, has magnetic gap 97a between adjacent two magnetic poles, and the magnetic field intensity of magnetic gap 97a is very weak.The electrical connection of the first coil 95a, the second coil 95b, actuating coil 95c and control chip 99 as shown in Figure 4, the first coil 95a and the second coil 95b are series at two pins of control chip 99, and link to each other with power supply (VDD), actuating coil 95c two ends are connected to the earth terminal of power supply and control chip 99.When motor 90 is in halted state, if the first coil 95a and the second coil 95b drop on magnetic gap 97a top simultaneously, magnetic field intensity herein is very weak, even if electrical power, also have no idea to utilize the first coil 95a and the second coil 95b to start, but actuating coil 95c at this moment is positioned at a certain magnetic pole top, can normally start, rotate thereby make rotor obtain certain deflecting force, then mainly utilize the first coil 95a and second coil 95b running after the startup.

Yet in this technical scheme, in case motor power supply, actuating coil 95c is in "on" position always, and the startup stage of comprising and the normal operation stage, this can increase the power consumption of motor.

Therefore, be necessary to propose a kind of new technical scheme, reduce the power consumption of motor.

[summary of the invention]

The technical problem to be solved in the present invention is to provide a kind of brushless vibrating dynamo of saving power consumption.

The present invention solves above-mentioned technical problem by such technical scheme:

A kind of brushless vibrating dynamo, it mainly comprises base, loam cake and be supported on base and loam cake between rotating shaft, base is provided with circuit board, distribute on the circuit board and be provided with first coil, second coil, actuating coil between first coil and second coil, and control chip, control chip has Hall element, first coil and second coil are series at two pins of control chip, and be communicated with power end, actuating coil one end is connected in power end, the other end is connected in another pin of control chip, a wherein pin ground connection of control chip, the pin of this ground connection and be connected between another pin of actuating coil motor normal start or operation process in not conducting.

As a kind of improvement of the present invention, a wherein pin of control chip is connected to a control unit.

As a kind of improvement of the present invention, the line of centres of first coil and second coil is by the rotation of rotor.

As a kind of improvement of the present invention, the center of actuating coil and the line of rotation are perpendicular or normal to the line of centres of first coil and second coil.

Compared with prior art, the present invention has the following advantages: Hall element can control whether pass through electric current in the actuating coil, switch in the actuating coil under the feasible state that can't normally start, and after starting under the situation that can normally start and under the situation of improper startup, no current in the actuating coil, rather than omnidistance energising, thereby saved the power consumption of vibrating motor.

[description of drawings]

Fig. 1 is the generalized section of brushless vibrating dynamo in the background technology.

Fig. 2 is coil and the distribution schematic diagram of control chip on circuit board among Fig. 1.

Fig. 3 is the floor map of magnet among Fig. 1.

Fig. 4 is the coil of the brushless vibrating dynamo among Fig. 1 and the schematic diagram that is electrically connected of control chip.

Fig. 5 is the generalized section of brushless vibrating dynamo of the present invention.

Fig. 6 is coil and the distribution schematic diagram of control chip on circuit board among Fig. 5.

Fig. 7 is the floor map of magnet among Fig. 5.

Fig. 8 is the coil of the brushless vibrating dynamo among Fig. 5 and the schematic diagram that is electrically connected of control chip.

Fig. 9 is the electrical connection schematic diagram of another embodiment of the invention.

[embodiment]

Describe content of the present invention in detail below in conjunction with accompanying drawing.

Please join Fig. 5 and Fig. 6, brushless vibrating dynamo 10 of the present invention, be used for the portable consumer electronic product, its mainly comprise base 11, loam cake 12 and be supported on base 11 and loam cake 12 between rotating shaft 13, base 11 is provided with circuit board 110, distributing on the circuit board 110 is provided with the first coil 111a, the second coil 111b, the actuating coil 111c between the first coil 111a and the second coil 111b, and control chip 17, and control chip 17 has Hall element 17a.Circuit board 110 with and on the first coil 111a, the second coil 111b, actuating coil 111c and control chip 17 be the rotor of motor.Preferably, the line of centres L1 of the first coil 111a and the second coil 111b is by the rotation O of rotor, and the line L2 of the center of actuating coil 111c and rotation O is perpendicular or normal to the line of centres L1 of the first coil 111a and the second coil 111b.

Be provided with stator with the rotor opposition of being separated by, this stator comprises can be around the substrate 14 of rotating shaft 13 rotations, be fixed on magnet 15 and weighting block 16 on its plate 14.Please join Fig. 7, magnet 15 is circular, and it is provided with the magnetic pole at some intervals, has magnetic gap 15a between adjacent two magnetic poles, and the magnetic field intensity of this magnetic gap 15a is very weak.

Please join Fig. 8, the annexation of each coil and control chip 17 is as follows: the first coil 111a and the second coil 111b are series at two pins of control chip 17, and be communicated with power end (VDD), actuating coil 111c one end is connected in power end, the other end is connected in another pin of control chip 17, a wherein pin ground connection of control chip 17.

Under the normal condition, the first coil 111a and the second coil 111b are positioned at the top of two magnetic poles, when wherein aliving, produce electromagnetic force under the effect in magnetic field, the interaction of electromagnetic force makes that rotor begins to rotate, after the rotation, magnetic direction can not stop to change, Hall element 17a in the control chip 17 can detect the variation of this magnetic direction, can change sense of current simultaneously, makes that the suffered magnetic field force direction of coil is constant.In this process, Hall element 17a can detect the change of the bigger intensity in magnetic field and intensity and direction, can be to control chip 17 transmission signals, cause the pin that control chip 17 will be connected with actuating coil 111c and the pin of ground connection to disconnect, no current passes through among the actuating coil 111c at this moment.

When brushless vibrating dynamo 10 halted states, if the first coil 111a and the second coil 111b are in magnetic gap 15a top simultaneously, even pass through electric current among the first coil 111a and the second coil 111b, also can not stressedly rotate because magnetic field intensity is very little, it is very little that Hall element 17a can detect magnetic field, almost nil, can not detect simultaneously the variation of magnetic field intensity again, at this moment, Hall element 17a can send signal to control chip 17, the pin that control chip 17 can will be connected with actuating coil 111c and the pin of ground connection are communicated with, promptly, feed electric current among the actuating coil 111c, actuating coil 111c is the top that is positioned at a certain magnetic pole, the then force-applied biography of revolving behind the feeding electric current, thereby make that rotor begins to rotate, this process is improper startup, in case rotate, Hall element 17a then detects the variation of magnetic field intensity and the direction in magnetic field, can be to control chip 17 transmission signals, cause the pin that control chip 17 will be connected with actuating coil 111c and the pin of ground connection to disconnect, no current passes through among the actuating coil 111c of this moment.

Therefore, formation of the present invention, can be so that switch among the actuating coil 111c under the state that can't normally start, and after starting under the situation that can normally start and under the situation of improper startup, no current among the actuating coil 111c, rather than omnidistance energising, thereby saved the power consumption of vibrating motor.

Please join Fig. 9, be another kind of execution mode, in this execution mode, mainly be that the wherein pin with control chip 17 ' is connected to a control unit 20, and this control unit 20 can be used for controlling switch or other functions of entire circuit.

The above only is a better embodiment of the present invention; protection scope of the present invention is not exceeded with above-mentioned execution mode; as long as the equivalence that those of ordinary skills do according to disclosed content is modified or changed, all should include in the protection range of putting down in writing in claims.

Claims

1. brushless vibrating dynamo, it mainly comprises base, loam cake and be supported on base and loam cake between rotating shaft, base is provided with circuit board, distribute on the circuit board and be provided with first coil, second coil, actuating coil between first coil and second coil, and control chip, control chip has Hall element, it is characterized in that: first coil and second coil are series at two pins of control chip, and be communicated with power end, actuating coil one end is connected in power end, the other end is connected in another pin of control chip, a wherein pin ground connection of control chip, the pin of this ground connection and be connected between another pin of actuating coil motor normal start or operation process in not conducting.

2. brushless vibrating dynamo according to claim 1 is characterized in that: a wherein pin of control chip is connected to a control unit.

3. brushless vibrating dynamo according to claim 1 is characterized in that: the line of centres of first coil and second coil is by the rotation of rotor.

4. brushless vibrating dynamo according to claim 3 is characterized in that: the center of actuating coil and the line of rotation are perpendicular or normal to the line of centres of first coil and second coil.