JP3125496U - BLDC vibration motor - Google Patents

Abstract

[PROBLEMS] To stop the rotation of a rotor at a position where the magnetic poles of the rotor maintain a balance to improve the rotational torque of the rotor and the performance at the time of initial startup, as well as the non-startup caused by a BLDC vibration motor. By solving the problems and building the reliability of the product, high vibration force can be exhibited with the same outer diameter and thickness as the conventional BLDC vibration motor, and both can be made small and thin. A BLDC vibration motor is provided.
A bracket of a single-phase drive type BLDC vibration motor having a non-starting point is made of a soft magnetic material, and a predetermined equal interval is maintained on the bracket made of a soft magnetic material via an incision. The cogging torque generating unit is configured.
[Selection] Figure 1

Description

  The present invention relates to a single-phase drive type BLDC vibration motor, and more specifically, a single-phase drive type flat vibration motor having a non-starting point generates a cogging torque so that the rotational torque of the rotor is Of course, the present invention relates to a BLDC vibration motor capable of improving the performance at the time of initial startup.

  In general, one of the most widely spread to the public with the recent development of communication technology is the mobile communication terminal.

  Such mobile communication terminals are not only smaller and easier to carry, but also can be used for voice and data (Data) communication anytime, anywhere. The seat is solidified as a new communication equipment.

  Such mobile communication terminals can communicate in public places unlike ordinary wired telephones, so that they can be recognized only by users in addition to sound signals such as bell sounds. No incoming signal is required.

  Recently, demands for longer life and higher reliability are increasing due to the increased frequency of use of vibration modes in mobile communication terminals.

  Such a brushless DC (BLDC) vibration motor is roughly divided into a main body composed of an upper case and a lower bracket, a stator fixed inside the case, and the fixing. A rotor that rotates by mutual magnetic action with a rotor and a fixed shaft formed at the center of the rotor. The stator is again a PCB (Printed Circuit Board), a coil, and a hole. It is composed of an element driving IC.

  In addition, the rotor has a rotor body integrally formed by inserting a back yoke (Back Yoke), a magnet (Magnet) and a weight (Weight) into a mold frame and press-fitting a synthetic resin material. Constitute.

  In both cases, a stopper (Stopper), which is one of cogging torque generating means, is passed through the circuit board so that the rotation of the rotor is stopped if necessary on one side of the bracket. To form.

  However, since the stopper, which is a cogging torque generating means as described above, has a structure that pulls the magnetic pole center of the magnet and stops the rotor, this causes a problem that the stop positions of the rotor are scattered. That is, it is impossible to effectively prevent a non-starting point due to a dead point of the driving IC.

  In other words, the non-starting point is a single-phase vibration motor where the coil torque becomes zero when the pole center of the magnet coincides with the magnetic center of the coil. A stopper is used as a cogging torque generating means for eliminating such a non-starting point. However, the stopper cannot perform its function properly due to the phenomenon that the stop positions of the rotor are scattered.

  In addition, conventionally, the operation of stopping the rotor at a fixed position due to the mutual suction input of the bottom of the bracket excluding the stopper and the magnet is subject to interference, so that the rotational torque of the rotor is weak or the initial startup is decent. Brought about a problem that never happened.

  Accordingly, the present invention has been devised to solve the conventional problems as described above, and the present invention uses a soft magnetic material for the bracket of a single-phase drive type BLDC vibration motor having a non-starting point. On the other hand, by configuring a cogging torque generation unit that maintains a predetermined equal interval through a cutout on a bracket made of a soft magnetic material, the rotor magnetic poles rotate at a position that maintains a balance. In addition to improving the rotation torque of the rotor and the initial startup performance by stopping the rotation of the rotor, it solves the non-starting point caused by the BLDC vibration motor and builds reliability for the product. To provide a BLDC vibration motor that can be made smaller and thinner by enabling high vibration force to be exerted with the same outer diameter and thickness as the vibration motor. There is its main purpose to.

  In order to achieve the above object, the present invention BLDC vibration motor is:

  In configuring a BLDC vibration motor in which a stator and a rotor are formed between an upper case and a lower bracket, and a fixed shaft is formed at the center of the rotor,

  The stator includes one or more coils having a trapezoidal shape on an upper surface of a circuit board, a Hall element and a chip-shaped control unit that functions as a driving IC,

  The rotor is configured by inserting a magnet and weight into a resin rotor body, and a soft magnetic back yoke for shielding and magnetic balance of magnetic leakage,

  The bracket is formed of a soft magnetic material so as to integrate a number of cogging torque generating portions that are maintained at predetermined equal intervals through the incision portion so that the rotor is stopped at a fixed position as necessary.

  A disc-shaped cover plate made of a non-magnetic material is installed on one surface of the bracket on which the cogging torque generating portion is formed.

  According to another aspect, the cogging torque generating unit further includes a protrusion for enhancing the strength of the cogging torque.

  According to another aspect, the cogging torque generator is

  A plurality of cogging torque segments composed of a soft magnetic material are coupled to a bracket of an annular plate-shaped material that is made of a non-magnetic material but no incision is prepared, so that a predetermined equal interval is maintained. Features.

  According to another aspect of the present invention, a shaft through hole is prepared at the center, and a cogging torque intercept is formed by one structure that is symmetrical with respect to the shaft through hole.

  According to another aspect of the present invention, the cogging torque intercept is configured such that the cogging torque intercept is bonded to one surface of a bracket that is a non-magnetic material via a metal tape.

  According to another aspect, the cogging torque intercept is configured such that the cogging torque intercept is adhered to one surface of the circuit board via a metal tape.

  According to another aspect, the cogging torque generator is configured to maintain an equal interval by the number of “magnet poles / 2”.

  According to another aspect of the present invention, the installation position is set so that the central portion of the cogging torque generating portion deviates from the central portion of the coiled coil by a predetermined angle.

  As described above, according to the present invention, a single-phase drive type BLDC vibration motor bracket having a non-starting point is formed of a soft magnetic material, and on the bracket made of a soft magnetic material, a predetermined incision is made via an incision. By configuring a cogging torque generator that maintains the same interval, the rotor's rotation is stopped at the position where the rotor's magnet magnetic pole maintains the balance, improving the rotor's rotational torque and initial startup performance. Of course, it is possible to solve the non-starting point caused by the BLDC vibration motor and build the reliability of the product, so that a high vibration force can be exhibited with the same outer diameter and thickness as the conventional BLDC vibration motor. Thus, there is an effect that both can be reduced in size and thickness.

  The present invention is not limited to the specific preferred embodiments described above, and various modifications may be made by anyone having ordinary knowledge in the technical field to which the invention belongs without departing from the spirit of the present invention claimed in the claims. Of course, such modifications are intended to fall within the scope of the appended claims.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view illustrating a structure of a BLDC vibration motor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG. 1 according to an embodiment of the present invention. FIG. 6 is an optimized state diagram of a stop position for a rotor in one embodiment.

  1 to 3, a BLDC vibration motor according to an embodiment of the present invention includes a case 10, a bracket 20, a stator 30, a rotor 40, a fixed shaft 50, a cogging torque generator 60 and a cover plate 70. Including.

  The case 10 is configured to cover the bracket 20 and the fixed shaft 50 in the form of a cap.

  The bracket 20 is a soft magnetic material, and forms a shaft support base 22 into which the fixed shaft 50 is inserted. The bracket 20 is centered on the shaft support base 22 and is equally spaced by the number of “magnet poles / 2”. An incision 21 is prepared for preparing a cogging torque generator 60 for maintaining the above.

  The stator 30 is fixed to the upper surface of the bracket 20, which has one or more coils 32 that generate a predetermined electromagnetic force while having a trapezoidal shape on the upper surface of the circuit board 31, a Hall element, and a driving IC. It includes a chip-shaped control unit 33 that functions as follows.

  At this time, the control unit 33 is configured to detect the polarity of a magnet 42 (to be described later) to generate an electrical signal and determine the current direction of the coil 32 according to the polarity of the magnet 42.

  In the rotor 40, a magnet 42 having a predetermined number of poles and a weight 43 are formed by an insert system on a rotor body 41 made of a resin material, and a soft magnetic material for shielding magnetic leakage and for magnetic balance is used. The back yoke 44 is configured to be inserted, and is rotated by the mutual magnetic action with the stator 30 to be prepared in the case 10.

  The magnet 42 is configured to interact with an electromagnetic force generated by the coil 32 to generate a force such as an attractive force and a repulsive force, and to rotate at a predetermined speed by the force.

  One end of the fixed shaft 50 is inserted into a shaft support base 22 prepared in the bracket 20 and the other end is fixed between shaft grooves of the case 10 so that the rotor 40 can be rotated. The slip is supported by the washer 51.

  In both cases, a metal bearing 52 is coupled to the fixed shaft 50 inserted into the shaft support 22, but the metal bearing 52 is formed between the center of the rotor body 41 and the fixed shaft 50. The shaft 50 is press-fitted and fixed.

  The cogging torque generator 60 stops the rotation of the rotor 40 at a position where the magnetic poles of the magnet 42 maintain a balance while generating a cogging torque due to a magnetic resistance change in the hole due to a change in the position of the rotor 40 and the stator 30. The cogging torque is generated as described above, and is a structure integrated with the bracket 20, which is designed in a number that maintains a predetermined equal interval by the incisions 21 provided in the bracket 20, The number maintaining the equal intervals corresponds to “the number of poles of the magnet 42/2” included in the rotor 40.

  In one embodiment, when the magnet 42 has four poles, the cogging torque generator 60 is designed to have a number (two) that maintains an equal interval of 180 °, and when the magnet 42 has six poles, the cogging torque. The generators 60 are designed to have a number (three) that maintains an equal interval of 120 °.

  As described above, each cogging torque generator 60 that maintains a predetermined equal interval is provided with a protrusion 61 for enhancing the strength of the cogging torque, while the central portion thereof is a coiled coil 32. The installation position is set so as to be deviated by a predetermined angle at the center portion.

  The cover plate 70 is installed on one surface of the bracket 20 on which the cogging torque generator 60 is formed. The cover plate 70 is a non-magnetic material and is configured to protect the internal components of the BLDC vibration motor from the outside. .

  The operation of the embodiment of the present invention constructed as above will be described with reference to FIGS. 1 to 3 attached hereto.

  First, after the phase angle and the arrangement angle of the coil 32 are arranged at α and β as shown in FIG. 3, the control unit 33 is also installed at a predetermined angle, and then the central portion deviates from the center of the coil 32. In addition, a number of cogging torque generators 60 that maintain a predetermined equal interval while making incisions 21 in the bracket 20 made of a soft magnetic material are integrated.

  Thereafter, when a current is applied to the BLDC vibration motor, the current is applied via the circuit board 31 to the two coils 32 that are wired with the control unit 33 formed on the circuit board 31.

  At this time, the controller 33 to which the power is applied senses the polarity N and S of the magnet 42 and determines the current direction of the coil 32, and then applies a current to the coil 32.

  Then, the coil 32 is excited and generates an electromagnetic force due to the mutual magnetic action with the magnet 42, and is integrated into the magnet 42, the weight 43, the back yoke 44, and the metal bearing 52 by the generated electromagnetic force. The rotor body 41 rotates.

  Accordingly, the rotor body 41 is caused to generate a vibration, which is a silent incoming signal, by rotating eccentrically as the weight 43 is unbalanced.

  At this time, if the magnetic center of the coil 32 and the magnetic center of the magnet 42 coincide with each other, the torque is weakened at the non-starting point which is the magnetic center position, and the initial start is not performed.

  Therefore, after forming the incision portion 21 in the bracket 20, the cogging torque generating portion 60 in which the projection portion 61 is formed is maintained in inverse proportion to the polarity of the magnet 42 while maintaining a predetermined equal interval through the incision portion 21. While preparing the cogging torque generator 60 that maintains the number of magnets, that is, the number of “magnet poles / 2” at equal intervals, the central portion of the cogging torque generator 60 is at an angle at which the center portion of the coil 32 deviates from each other. Set the position.

  By doing so, the magnetic flux generated by the torque on the coil 32 side at the position facing the magnetic pole of the magnet 42 and the magnetic flux generated by the cogging torque on the cogging torque generating unit 60 side in which the strength of the cogging torque is complemented by the protrusion 61 are combined. The magnetic center of the magnet 42 deviates from the magnetic center. That is, the rotation of the rotor 40 continues through the magnetic activation while the initial unactivation of the rotor 40 disappears due to the characteristics of the electromagnetic force.

  That is, as shown in FIG. 3, the cogging torque generator 60 generates the cogging torque at the non-starting point of the motor, which is the point where the torque of the coil 32 drops to the lowest when the rotor 40 rotates due to the mutual shift of the magnetic centers. So

  While the cogging torque is adjusted to the coil torque, the overall torque of the BLDC vibration motor does not become zero at the non-starting point, and accordingly, the magnet 42 of the rotor 40 is mutually electromagnetic with the coil 32 and the cogging torque generating unit 60. When rotating by force, the rotor 40 generates vibration while causing eccentricity by the weight 43 installed on one side of the back yoke 44 of the rotor 40.

  On the other hand, FIGS. 4 and 5 show another embodiment of the present invention. This is because the annular plate-shaped bracket 20 ′ is made of a non-magnetic material having no incision portion, and then soft magnetic is formed on the plane of the bracket 20 ′. A plurality of cogging torque segments 62 composed of a body are coupled so as to maintain a predetermined equal interval so that the same effect as that of one embodiment of the present invention can be obtained.

  FIG. 6 shows still another embodiment of the present invention, which shows that the cogging torque intercept 63 is constituted by one structure.

  That is, the cogging torque intercept 63 in FIG. 6 has a symmetrical structure around the shaft through hole 63a with the shaft through hole 63a provided at the center. Since the form and the effect are the same, the overlapping description is omitted.

  Both of the cogging torque intercepts 63 in FIG. 6 can be designed as a single structure in which the intercepts are arranged in a direction maintaining a 120 ° angle around the shaft through hole 63a. 2 ".

  At this time, the cogging torque segments 62 and 63 shown in FIGS. 4 to 6 are bonded to one surface of the bracket 20 ′ which is a non-magnetic material with a double-sided metal tape 64 or to one surface of the circuit board 31. The metal tape 64 is used for adhesion.

The disassembled perspective view which showed the structure of the BLDC vibration motor by one Embodiment of this invention. 1 is a cross-sectional view of FIG. 1 according to an embodiment of the present invention. The optimization state figure of the stop position with respect to a rotor in one embodiment of the present invention. The disassembled perspective view of the state by which the section | slice which is a soft magnetic body was couple | bonded with the bracket which is a nonmagnetic body in other embodiment of this invention. FIG. 5 is a cross-sectional view of FIG. 4 according to another embodiment of the present invention. FIG. 6 is another embodiment of a section that is a soft magnetic material shown in FIG. 4.

Explanation of symbols

10: Case 20, 20 ': Bracket 21: Incision part 30: Stator 31: Circuit board 32: Coil 33: Control part 40: Rotor 41: Rotor main body 42: Magnet 43: Weight 44: Back yoke 50: Fixed Shaft 51: Washer 52: Metal bearing 60: Cogging torque generating portion 61, 61 ': Protruding portion 62, 63: Cogging torque intercept 63a: Shaft through hole 64: Metal tape 70: Cover plate

Claims (11)

In configuring a BLDC vibration motor in which a stator and a rotor are formed between an upper case and a lower bracket, and a fixed shaft is formed at the center of the rotor,
The stator includes one or more coils having a trapezoidal shape on the upper surface of the circuit board, and a chip-shaped control unit that functions as a Hall element and a driving IC.
The rotor is constituted by inserting a magnet and a weight, and a soft magnetic back yoke for shielding and magnetic balance in a resin rotor body,
The bracket is formed of a soft magnetic material so as to integrate a number of cogging torque generating portions that are maintained at predetermined equal intervals through the incision portion so that the rotor is stopped at a fixed position as necessary.
A BLDC vibration motor, wherein a disc-shaped cover plate made of a non-magnetic material is installed on one surface of a bracket on which the cogging torque generating portion is formed.   The BLDC vibration motor according to claim 1, wherein the cogging torque generation unit further includes a protrusion for enhancing the strength of the cogging torque.   3. The BLDC vibration motor according to claim 2, wherein an installation position of the central portion of the cogging torque generating unit is set so as to be deviated from the central portion of the coiled coil by a predetermined angle. In the BLDC vibration motor according to any one of claims 1 to 3,
The BLDC vibration motor according to claim 1, wherein the cogging torque generator is configured to maintain an equal interval with the number of "magnet poles / 2". In configuring a BLDC vibration motor in which a stator and a rotor are formed between an upper case and a lower bracket, and a fixed shaft is formed at the center of the rotor,
The stator includes one or more coils having a trapezoidal shape on the upper surface of the circuit board, and a chip-shaped control unit that functions as a Hall element and a driving IC.
The rotor is constituted by inserting a magnet and a weight, and a soft magnetic back yoke for shielding and magnetic balance in a resin rotor body,
The bracket is made of an annular plate-like body made of a non-magnetic material, and a plurality of cogging torque segments made of a soft magnetic material are provided on the inner plane of the bracket so as to generate a cogging torque. A BLDC vibration motor characterized by being coupled so as to maintain equal intervals.   6. The BLDC vibration motor according to claim 5, wherein a shaft through hole is prepared at the center, and a cogging torque intercept is constituted by a single structure that is symmetrical about the shaft through hole.   The BLDC vibration motor according to claim 5, wherein the cogging torque intercept further includes a protrusion for enhancing the strength of the cogging torque.   7. The BLDC vibration motor according to claim 5, wherein the installation position is set so that the central portion of the cogging torque intercept is deviated by a predetermined angle at the central portion of the coiled coil.   7. The BLDC vibration motor according to claim 5, wherein the cogging torque intercept is configured such that the cogging torque intercept is adhered to one surface of a bracket made of a non-magnetic material via a metal tape.   7. The BLDC vibration motor according to claim 5, wherein the cogging torque intercept is configured to be adhered to one surface of the circuit board via a metal tape. 7. The BLDC vibration motor according to claim 5, wherein the cogging torque intercept is configured so that an equal interval is maintained by the number of “magnet poles / 2”. 8.

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