JP2012085474A - Fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fan motor that suppresses an increase in noise and vibration.SOLUTION: A fan motor for on-vehicle and for driving a fan comprises a stator, a coil for magnetizing the stator, a revolving shaft connected to a fan, a yoke connected to the revolving shaft, a rotor that is fixed on the yoke and contains a permanent magnet whose magnetic force acts between the stator, and a supporting member that pivotably supports the revolving shaft and is integrally molded with the stator and the coil by insert molding.

Description

  The present invention relates to a stator structure for a fan motor.

Some motors include a stator, a rotor, and a support member that rotatably supports a rotating shaft connected to the rotor.
When such a motor is used in, for example, a vehicle air conditioner, a seat seat air conditioner, or a cooling device for a large-capacity battery used in a hybrid vehicle, a fan is attached to a rotating shaft to cause wind. As a result, ventilation for cooling and heating the inside of the vehicle and seats, and heating of the large-capacity battery are suppressed, and the battery life and output characteristics are stabilized. Patent Documents 1 and 2 disclose techniques related to such a fan motor.

JP 2002-112504 A JP 2010-161895 A

  In such a motor, a case where the stator is assembled to a support member that rotatably supports the rotating shaft of the rotor can be considered. For example, the support member and the stator are fixed by adhesion, welding, screw tightening, or the like. In general, since the support member and the stator are made of different materials, the coefficients of thermal expansion of both members are also different. For this reason, there exists a possibility that the state of the contact part of a support member and a stator may change under the influence of heat. As a result, the support member and the stator may resonate and noise and vibration may increase.

  Accordingly, an object of the present invention is to provide a fan motor in which an increase in noise and vibration is suppressed.

  The object includes a stator, a coil for exciting the stator, a rotating shaft, a yoke connected to the rotating shaft, and a permanent magnet fixed to the yoke and acting as a magnetic force with the stator. Achieved by a fan motor for driving a fan that is mounted on a vehicle and includes a rotor and a support member that rotatably supports the rotating shaft and is integrally formed with the stator and the coil by insert molding. it can.

  Since the support member is formed integrally with the stator and the coil, a change in the state of the contact portion between the support member and the stator is suppressed. Along with this, noise and vibration are suppressed.

  According to the present invention, it is possible to provide a fan motor in which an increase in noise and vibration is suppressed.

FIG. 1 is a configuration diagram of a vehicle including a cooling device that employs a fan motor according to the present embodiment. FIG. 2 is a cross-sectional view of the fan motor of this embodiment. FIG. 3 is a cross-sectional view of a fan motor having a structure different from that of the fan motor of the present embodiment.

  FIG. 1 is a configuration diagram of a vehicle 1 including a cooling device that employs a fan motor according to the present embodiment. The vehicle 1 includes an ECU 100, an engine 110, a driving motor 120, a power split device 130, a shaft 140, a battery 150, and a cooling device 160. As will be described in detail later, the fan motor of this embodiment is employed in the cooling device 160. The vehicle according to the present embodiment is a hybrid vehicle that can switch the engine 110 and the drive motor 120 as a drive source of the vehicle according to a required traveling state of the vehicle. The ECU 100 is an electronic control unit that controls the operation of the entire vehicle 1. The ECU 100 includes a CPU, a ROM, and a RAM. The ECU 100 issues a command to each device according to output values from various sensors. The power split device 130 is a planetary gear mechanism, and can switch between the power of the engine 110 and the power of the drive motor 120 and transmit it to the shaft 140.

  The drive motor 120 is driven based on the electric power from the battery 150. The cooling device 160 cools the battery 150. The cooling device 160 is controlled by the ECU 100. The cooling device 160 cools the battery 150, thereby suppressing a decrease in charging efficiency due to a temperature rise.

  FIG. 2 is a cross-sectional view of the fan motor M of this embodiment. A fan F is connected to the fan motor M. The fan F is rotated by the power of the fan motor M. As fan F rotates, battery 150 is cooled. Driving of the fan motor M is controlled by the ECU 100.

  The fan motor M includes a support member 10, a stator 20, a coil 30, a rotor 40, a printed board 60, a heat radiating member 80, a lid 90, and the like. The support member 10 is made of a synthetic resin and supports the rotor 40 so as to be rotatable. The stator 20 is made of metal. A plurality of coils 30 are wound around the stator 20. The coil 30 is electrically connected to the printed circuit board 60 by the terminal portion 36. The printed circuit board 60 is obtained by forming a conductive pattern on a rigid insulating substrate. When the coil 30 is energized, the stator 20 is excited. The support member 10 is integrally formed with the stator 20 and the coil 30 by insert molding. The terminal portion 36 is also electrically connected to the coil 30 and is integrally formed with the support member 10 by insert molding. The support member 10 and the printed circuit board 60 are formed separately.

  The rotor 40 has a rotating shaft 42, a yoke 44, and a plurality of permanent magnets 46. The rotating shaft 42 is rotatably supported by the support member 10 via a radial bearing 52 and a thrust bearing 54. A fan F is fixed to the tip of the rotating shaft 42. A yoke 44 is fixed to the rotation shaft 42, and the yoke 44 rotates together with the rotation shaft 42. The yoke 44 is substantially cylindrical and is made of metal. A plurality of permanent magnets 46 are fixed to the inner peripheral side surface of the yoke 44. The permanent magnet 46 faces the outer peripheral surface of the stator 20. The rotor 40 rotates with respect to the stator 20 by a magnetic attractive force and a repulsive force acting between the permanent magnet 46 and the stator 20. Thus, the fan motor M is an outer rotor type motor in which the rotor 40 rotates.

  The support member 10 includes an opening portion 11, a shaft holding portion 12, a surrounding portion 14, a partition portion 16, a connector portion 17, and a motor support portion 18. The shaft holding portion 12 defines a hole into which the rotary shaft 42, the radial bearing 52, and the thrust bearing 54 are inserted. The surrounding portion 14 covers the periphery of the stator 20 and the coil 30. The surrounding portion 14 does not cover the outermost outer peripheral side surface of the stator 20 facing the permanent magnet 46. The partition 16 is formed in a horizontal plane direction perpendicular to the rotation shaft 42 in order to support the printed circuit board 60. Moreover, the connector part 17 becomes a shape connected with the other party connector which is not shown in figure. Further, the motor support portion 18 protrudes further outward from the partition portion 16 and includes a hole G described later.

  The printed circuit board 60 is fixed to the back side of the partition 16. The rotor 40 is provided on the front side of the partition portion 16. The partition unit 16 partitions the rotor 40 and the printed circuit board 60. An electronic component 68 is mounted on the back side of the printed board 60. The electronic component 68 is an electronic component that generates heat. For example, the electronic component 68 is an output transistor (switching element) such as an FET or a capacitor for controlling the energization state of the coil 30. The back surface of the printed circuit board 60 on which the electronic component 68 is mounted is not covered with the support member 10. A wiring W for connecting to an external device is connected to the printed board 60.

  The wiring W is formed integrally with the support member 10. After the wiring W and the support member 10 are integrally formed, the wiring W is inserted into a hole formed in the printed board 60, and the wiring W and the printed board 60 are electrically connected by soldering.

  The support member 10 is provided with a hole G for fitting the anti-vibration rubber 70, and the anti-vibration rubber 70 can be changed in a timely manner according to the use situation. The motor M is installed at a predetermined position by fixing the motor support portion 18 via a vibration isolating rubber 70 fitted in the hole G to an installation wall (not shown) or a bolt.

  In this embodiment, the opening 11 of the support member 10 that accommodates the printed circuit board 60 is press-fitted and covered with a lid 90 in order to ensure drip-proof and dust-proof. The electronic component 68 and the heat dissipation member 80 are in contact with each other directly or through a heat transfer material, and the heat generated from the electronic component 68 is cooled by the heat dissipation member 80. The heat radiating member 80 is made of a metal having a high thermal conductivity and includes a plurality of fins. The heat radiating member 80 is also formed integrally with the support member 10. The heat dissipation member 80 and the electronic component 68 are thermally connected by a metal member or an adhesive having high thermal conductivity. Further, the heat radiating member 80 and the electronic component 68 may be connected by, for example, a heat pipe in which a volatile liquid is sealed as a working fluid.

  In addition, when it is not necessary to ensure drip-proof property and dust-proof property in particular, the cover part 90 does not need to be used. In this case, the heat of the electronic component 68 can be released from the opening 11 without attaching the heat radiating member 80.

  Next, the fan motor M of the present embodiment will be described in comparison with the fan motor Mx having a structure different from that of the fan motor M of the present embodiment. FIG. 3 is a cross-sectional view of a fan motor Mx having a structure different from that of the fan motor M of the present embodiment. In addition, about the fan motor Mx, about the part similar to the fan motor M of a present Example, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  As shown in FIG. 3, in the fan motor Mx, the support member 10x is molded separately from the stator 20x and the coil 30x. Specifically, the stator 20x is fitted around the shaft holding portion 12x of the support member 10x in a state where the coil 30x is wound. Further, the support member 10x and the stator 20x are fixed by adhesion, welding, screw tightening, or the like. For this reason, when the fan motor Mx is heated to a high temperature, the state of the contact portion between the support member 10x and the stator 20x changes, which may increase noise and vibration due to resonance. In particular, when the fan motor Mx is disposed in the vicinity of the battery 150 that is heated, the fan motor Mx may be heated depending on the arrangement conditions and the like.

  However, in the fan motor M of this embodiment, as shown in FIG. 2, the stator 20 and the coil 30 are integrally formed with the support member 10 by insert molding. Thus, even when the fan motor M is heated, the state of the contact portion between the support member 10 and the stator 20 does not change compared to the fan motor Mx. Therefore, increase in noise and vibration is suppressed.

  As shown in FIG. 3, in the fan motor Mx, the area of the contact portion between the support member 10x and the stator 20x depends on the outer peripheral portion of the shaft holding portion 12x. For this reason, the area of the contact portion between the support member 10x and the stator 20x is relatively small, and the fastening force between the support member 10x and the stator 20x may be weak due to the influence of heat or the like.

  However, in the fan motor M of the present embodiment, as shown in FIG. 2, the fan motor M is integrally formed with the support member 10 up to the outermost portion of the stator 20. For this reason, the contact area between the support member 10 and the stator 20 is larger than the contact area between the support member 10x and the stator 20x. Therefore, the decrease in the fastening force as described above can be suppressed, and the absolute structural strength can be increased. Thereby, the increase in the noise and vibration resulting from the fall of fastening force can be controlled.

  As shown in FIG. 3, in the fan motor Mx, the rotor 40x and the printed circuit board 60x face each other. For this reason, the printed circuit board 60x may vibrate due to the influence of the air flow caused by the rotation of the rotor 40x and the fan F.

  However, in the fan motor M of the present embodiment, as shown in FIG. 2, the partition portion 16 of the support member 10 partitions between the rotor 40 and the printed board 60. For this reason, the flow of air generated by the rotation of the rotor 40 is prevented from affecting the printed circuit board 60. Thereby, an increase in noise and vibration is suppressed.

  Further, as shown in FIG. 3, the printed circuit board 60x is partially exposed from the support member 10x. For this reason, when the printed circuit board 60x vibrates and generates noise, the sound leaks outside the support member 10x.

  However, in the fan motor M of the present embodiment, since the opening portion 11 is closed by the lid portion 90, most of the printed circuit board 60 is surrounded by the support member 10 and the lid portion 90. Even when the cover 90 is not provided, the printed circuit board 60 is surrounded by the support member 10 and the installation wall surface when the support member 10 is fixed to the installation wall surface. For this reason, even if the printed circuit board 60 vibrates for some reason and generates noise, it is possible to prevent leakage from the support member 10. Thereby, an increase in noise is suppressed.

  It is conceivable to suppress vibration of the printed circuit board by integrally forming the printed circuit board together with the support member by insert molding. However, such a configuration may cause the following problems. By repeatedly heating and cooling the support member, the support member repeatedly expands and contracts. As a result, repeated stress is applied to the printed circuit board, increasing the load on the printed circuit board.

  In addition, since the thickness and size of the support member vary depending on the location, the degree of expansion and contraction due to heat varies depending on the location. For this reason, there is a possibility that stress is repeatedly applied so that the printed circuit board is bent. In particular, when the printed circuit board is repeatedly bent, there is a risk of affecting the electrical connectivity with the electronic component mounted on the printed circuit board. In particular, when such a motor is used for a long period of time, the printed circuit board may be bent repeatedly, which may have an adverse effect.

  In the motor M of this embodiment, as shown in FIG. 2, the support member 10 and the printed circuit board 60 are not integrally formed. For this reason, the above load is not applied to the printed circuit board 60. Thereby, long-term use of the printed circuit board 60 is securable.

  Moreover, when the heat generating electronic component mounted on the printed circuit board is covered with the support member, the support member may partially become hot due to heat generation of the electronic component. When the temperature difference on the support member becomes large, the degree of expansion and contraction of the support member may greatly vary depending on the location. For this reason, when a support member partially expands and contracts partially, there is a possibility that stress is continuously applied to the printed circuit board. As a result, the printed circuit board may be repeatedly deformed so as to be bent.

  In the fan motor M of the present embodiment, as shown in FIG. 2, the heat generating electronic component 68 mounted on the printed circuit board 60 is not covered with the support member 10. For this reason, it is suppressed that the temperature difference on the supporting member 10 becomes large. This prevents the printed circuit board 60 from being deformed so as to bend repeatedly.

  As shown in FIG. 2, the back side of the printed circuit board 60 on which the electronic component 68 is mounted is not covered with the support member 10. As described above, the support member 10 is provided with the opening 11 that exposes the back side of the printed circuit board 60. For this reason, even if the support member 10 repeatedly expands and contracts due to the influence of heat, the influence on the printed circuit board 60 can be suppressed. The opening 11 only needs to expose at least part of the back side of the printed circuit board 60 on which the electronic component 68 is mounted.

  Further, the heat radiating member 80 is provided at a position where air is blown by the rotation of the fan F. Specifically, as shown in FIG. 2, the heat dissipating member 80 is disposed closer to the rotor 40 than the partition 16 that partitions the printed circuit board 60 and the rotor 40. Thereby, the heat radiating member 80 can be efficiently cooled, and thereby the electronic component 68 can be cooled.

  As described above, the fan motor 1 of the present embodiment can suppress the occurrence of various problems that may occur due to the thermal expansion and thermal expansion / contraction of the support member 10.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.

  Although the hybrid vehicle has been described as an example of the vehicle that employs the cooling device 160, the cooling device 160 may be employed in a normal vehicle that uses only the engine as a drive source.

  In the said Example, although the case where the cooling device 160 was employ | adopted as the vehicle 1 was demonstrated, this is not limited and the cooling device 160 may be employ | adopted for things other than a vehicle.

  In the said Example, although the battery 150 was demonstrated to the example as a cooling target object cooled with the cooling device 160, a cooling target object is not limited to the battery 150. FIG. For example, the cooling device 160 may be used for cooling the engine 110 and the drive motor 120, or may be used for air-conditioning ventilation or seat air-conditioning. Further, the cooling device 160 may be adopted for other than the vehicle.

  Although the example which employ | adopted the fan motor M for the cooling device 160 was demonstrated in the said Example, it is not limited to such an application, For example, you may use the fan motor M for an air conditioning apparatus etc.

  Although an output transistor has been described as an example of an electronic component that generates heat, other electronic components may be used as long as they generate heat.

DESCRIPTION OF SYMBOLS 1 Vehicle M Fan motor F Fan 10 Support member 16 Partition part 17 Connector part 18 Motor support part 20 Stator 30 Coil 40 Rotor 42 Rotating shaft 44 Yoke 46 Permanent magnet 60 Printed circuit board 68 Electronic component 80 Heat radiation member 90 Cover part 150 Battery 160 Cooling mechanism

Claims (6)

A stator,
A coil for exciting the stator;
A rotor having a rotating shaft to which a fan is connected, a yoke connected to the rotating shaft, a permanent magnet fixed to the yoke and acting as a magnetic force with the stator,
A support member that rotatably supports the rotating shaft and is integrally formed by insert molding together with the stator and the coil;
A fan motor for driving a fan for in-vehicle use. A printed circuit board to which the coil is electrically connected;
The printed circuit board is mounted with electronic components that generate heat,
The fan motor according to claim 1, wherein the electronic component is not covered with the support member.   The fan motor according to claim 2, wherein the printed circuit board is not formed integrally with the support member.   The fan motor according to claim 2, wherein the support member includes a partition portion that partitions the rotor and the printed board. A heat dissipating member to which heat from the electronic component is transmitted,
The fan motor according to claim 4, wherein the heat dissipation member is disposed closer to the rotor than the partition portion.   The fan motor according to claim 2, wherein the support member has an opening that exposes at least a part of a surface of the printed circuit board on which the electronic component is mounted.

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