KR20100039163A - Motor for driving fan - Google Patents

Abstract

PURPOSE: A motor for driving a fan is provided to prevent vibration applied to a fan by connecting a cushion rubber between a rotor shaft and a fan shaft. CONSTITUTION: A rotor(110) combines a permanent magnet with the outer circumference of a rotor core. The stator(120) is located in the radial direction of the rotor and protects the rotor. The rotary shaft comprises a rotor shaft and a shaft which is combined in the rotor shaft in concentric. An anti-vibration rubber(160) blocks up the transmission of the vibration between the rotor shaft and a fan shaft.

Description

Fan Drive Motor {MOTOR FOR DRIVING FAN}

The present invention relates to a fan motor, and more particularly, to a fan driving motor for dividing a rotation shaft for transmitting the rotational force of the rotor into the rotor shaft and the fan shaft and connecting through the anti-vibration rubber.

In general, examples of permanent magnet rotor motors include brushless DC motors and switched reluctance motors. The BLDC motor electronically changes the flow direction of the electric current to change the direction of the magnetic field so that the permanent magnet rotor rotates. In addition, the switched reluctance motor applies an alternating current voltage to each stator to the stator, and the permanent magnet rotor rotates by changing the reluctance of the magnetic field generated by interrupting the energizing current flowing through the permanent magnet of the rotor and the coil of each phase installed in the stator. Done. The BLDC motor is a variable speed motor that can easily control the rotational speed and the rotational direction and is widely used in driving devices such as home appliances.

More specifically, the BLDC motor is a rotor to form a field and transmit the torque to the outside, the magnetic field is generated by the rotation of the stator coil to generate a torque by interaction with the field to form a magnetic path at the same time A stator and a position detection device for detecting a rotational position of the rotor.

1 is a cross-sectional view showing a fan driving motor according to the prior art.

As shown in FIG. 1, the air conditioning BLDC motor according to the related art is pressed into the rotor core 11 and supported by a rotating shaft 30 supported by a bearing 50 mounted inside the cases 1 and 2. And a rotor (10) and a case (1, 2) including a motor driving magnet (12) mounted on an outer diameter surface of the rotor core (11) and a magnetic pole position detecting magnet (14) provided at side ends of the rotor core (11). Stator 20 and the stator core 21 and the drive coil 22 wound on the stator core 21 a plurality of times are mounted on the inner diameter surface of the motor opposite to the outer diameter surface of the motor driving magnet 12 and the It is mounted on the inner side of the case (1, 2) is installed in the PC 40 so as to be opposed to the side of the PC 40 and the magnetic pole position detecting magnet 14 to control the rotational speed of the rotor (10) And a Hall sensor 42 for detecting the detection signal for speed control of 10).

In the BLDC motor, since the rotor rotates at a high speed, vibration occurs when the rotor rotates at a high speed. In addition, the rotating shaft connected to the rotor also receives the vibration of the rotor as it is, and is transmitted to the fan coupled to the rotating shaft to generate noise.

Conventionally, in order to prevent such noise, rubber, plastic, or the like having low hardness is used between the rotor core and the rotating shaft inserted into the through hole of the rotor core. However, these rubber and plastics have a problem that can not be secured by aging when used for a long time.

      In the present invention, the vibration generated in the rotor is transmitted to the rotating shaft, the noise is transmitted to the fan that is constrained to the rotating shaft, the rotating shaft is separated into the rotor shaft and the fan shaft and connected to the fan by dust-proof rubber in between. The purpose is to prevent noise.

      The present invention, the rotor is coupled to the permanent magnet on the outer peripheral surface of the rotor core; A stator positioned in a radial direction of the rotor and surrounding the rotor; A rotation shaft including a rotor shaft press-fitted into the rotor and a fan shaft coupled concentrically to the rotor shaft and extending in the axial direction and fastened to the fan; And, it provides a fan drive motor comprising a; a suction member for preventing the transmission of vibration between the rotor shaft and the fan shaft.

In addition, in the present invention, the end of the rotor shaft facing each other and the end of the fan shaft to form a receiving groove for receiving the suction member, the end of the fan shaft and the end of the fan shaft facing each other is a projection connected to the suction member It provides a fan drive motor, characterized in that the fan shaft and the rotor shaft are coupled to each other through the suction member.

In addition, in the present invention, the suction member has a cylindrical shape, and includes an accommodating portion seated in the accommodating groove of the rotor shaft, and an exposing portion exposed to the outside in step with the accommodating portion beyond the outer diameter of the rotating shaft, and the hollow groove is provided on the fan shaft side. It provides a fan drive motor, characterized in that formed.

In addition, in the present invention, the insertion groove is formed in the center of the receiving groove of the rotor shaft, the projection of the fan shaft is formed long and provides a fan driving motor, characterized in that is inserted into the insertion groove through the suction member.

      In addition, in the present invention, the end of the rotor shaft and the end of the fan shaft facing each other provides a fan drive motor, characterized in that each receiving groove is formed to accommodate the suction member.

      In addition, in the present invention, the suction member has a cylindrical shape and includes an accommodating portion seated in the accommodating grooves of the rotor shaft and the fan shaft, and an exposing portion exposing the outside of the accommodating portion beyond the outer diameter of the rotating shaft between the accommodating portions. It provides a fan drive motor, characterized in that configured.

In addition, in the present invention, the suction member is a dust-proof rubber and the dust-proof rubber provides a fan drive motor, characterized in that the insert is injected into at least one of the rotor shaft and the fan shaft.

In addition, in the present invention, the suction member is a dust-proof rubber and the dust-proof rubber provides a fan drive motor, characterized in that coupled to any one or more of the rotor shaft and the fan shaft by an adhesive means.

In addition, in the present invention, the fan shaft coupled to the fan and the rotor shaft pressed into the rotor provides a fan drive motor, characterized in that the material is different.

In addition, in the present invention, the material of the rotor shaft is carbon steel, and the material of the fan shaft is plastic.

In addition, the present invention, the upper and lower bearings rotatably support the rotating shaft located on the upper and lower; And an upper case and a lower case forming an outer shape of the motor on the outer side of the bearing, and the exposed part is provided above the outer surface of the upper case.

The present invention can be divided into a rotor shaft press-fitted to the rotor shaft and a fan shaft connected to the fan and coupled to the dust-proof rubber therebetween to prevent the vibration generated from the rotor to be transmitted to the rotation shaft.

In addition, the present invention can reduce the noise generated in the fan to prevent the vibration-resistant rubber is transmitted to the fan generated in the rotor.

In addition, the present invention can form a protrusion at the end of the fan shaft to ensure a stable rotation by engaging with the rotor shaft through the anti-vibration rubber.

In addition, the present invention can reduce the manufacturing cost of the fan motor by making the rotor shaft and the fan shaft different materials.

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

2 is a cross-sectional view showing a fan driving motor according to the present invention.

As shown in FIG. 2, the fan driving motor according to the present invention includes an upper case 101 and a lower case 102 coupled to the upper case 101 to form an appearance of the motor. In the case of the sealed case, the upper case 101 and the lower case 102 are coupled by a fastening member such as a bolt (not shown). In order to solve the heat generation can be formed as an open case rather than a closed case. The case includes a heat dissipation unit (not shown) for heat dissipation because heat is mainly generated between the stator core 123 and the coil and the PC 140. The heat dissipation unit may be located at either the upper case 101 or the lower case 102, but is preferably formed at the side where the PCB 140 generating a lot of heat is located.

The cases 101 and 102 may be formed of various materials. For example, it can be formed of aluminum that is resistant to corrosion and easy to mold, and can be easily manufactured through aluminum die casting. Since the aluminum material is very excellent in thermal conductivity, it is possible to effectively conduct heat generated from the power device of the PC 140, and effectively radiate heat through the heat dissipation unit.

The rotor 110 is composed of a rotor core 112 and a permanent magnet 113. The rotor core 112 is laminated with lamination steel sheets, and lamination is usually made of silicon steel sheet. The center of the lamination steel sheet is formed with a through hole through which the rotation shaft 140 can be inserted, and the rotation shaft 140 is press-fitted into the through hole. Permanent magnets 113 are coupled to the outer circumferential surface of the rotor core 112. The rotor 110 generates a rotational force by electromagnetic interaction with the stator 120, the rotational force is transmitted through the rotation shaft 130 to rotate the fan coupled to the rotation shaft 130. The stator 120 is located radially outward of the rotor 110. The stator 120 includes an insulator 121 and 122, a stator core 123, and a coil (not shown). The insulator 121 is composed of an upper insulator 121 and a lower insulator 122 coupled to the top and bottom of the stator core 123, respectively, and coils are wound around the stator core 123 through the insulators 121 and 122. do. The insulators 121 and 122 are positioned between the stator core 123 and the coil to perform an insulation function and to fix the coil. A slot 125 is formed around the insulators 121 and 122, and a connection line of the coil is fixed to the slot 125.

The PC 140 is mounted with various electrical elements and controls the driving of the motor. In order to control the BLDC motor, a rectifier, a condenser, an inverter, a motor, and a rotor position detection circuit are included. The PC 140 may be located anywhere above or below the rotor core 112 and is connected to the end of the coil through soldering.

The rotating shaft 130 includes a rotor shaft 130a pressed into the rotor 110 and a fan shaft 130b fastened to the fan, and a suction member that prevents transmission of vibration between the rotor shaft 130a and the fan shaft 130b. It is included, is inserted into the through hole of the rotor 110 is fixed. The rotary shaft 130 is supported by the upper bearing 150 and the lower bearing 151 positioned in the upper case 101 and the lower case 102 forming the outer shape of the motor on the outer side of the bearing. The rotation shaft 130 transmits the rotational force of the rotor 110 to rotate the fan connected to one end of the rotation shaft 130. Accordingly, the rotation shaft 130 is divided into two pieces, that is, a fan shaft 130b which is a section in which the fan is fastened and a rotor shaft 130a which is a section in which the fan is press-fitted, and are concentrically coupled to extend in the axial direction. The rotary shaft of the present invention is hollow, but may be a hollow rotary shaft.

At this time, the insulating member is inserted between the fan shaft 130b and the rotor shaft 130a in order to couple the fan shaft 130b and the rotor shaft 130a, and the vibration generated from the rotor 110 is the rotor shaft 130a. This is to prevent the transfer to the fan shaft 130b. The type of insulation member is very diverse, but it is preferable to use the anti-vibration rubber (160).

Fan shaft (130b) is one end is formed with a screw thread is coupled to the fan, the other end is formed with a projection 131 for engaging with the rotor shaft (130a) through the anti-vibration rubber 160, the projection 131 is It is smaller than the outer diameter of the rotating shaft 130. In addition, a ring groove 132 is formed along the circumferential direction around the end where the protrusion of the fan shaft 130b is formed, and a fan stop ring (not shown) is fitted into the ring groove 132. The fan stop ring (not shown) functions as a stopper of the fan engaging with the rotating shaft 130.

One end of the rotor shaft 130a faces an end portion of which the protrusion 131 of the fan shaft 130b is formed, and forms a receiving groove 134 to be coupled to the fan shaft 130b through the anti-vibration rubber 160. Receiving portion 162 of the anti-vibration rubber 130 is seated in the receiving groove 134. The other end of the rotor shaft 130a forms a bearing portion 137 supported by the lower bearing 151. In addition, the rotor shaft 130a having the receiving groove 134 facing the fan shaft 130b has a ring groove 132 formed along the circumferential direction around the end portion, and the position of the rotation shaft is fixed to the groove. The rotary shaft stop ring 133 is fastened.

The anti-vibration rubber 160 must maintain a hardness that can support the load of the fan (not shown) that rotates through the rotating shaft (130). Therefore, when the load of the fan is increased, it is preferable that the hardness of the insert-proof dustproof rubber 160 is increased accordingly. The anti-vibration rubber 160 has a cylindrical shape and is exposed to the outside by accommodating the accommodating part 162 seated in the accommodating groove 164 of the rotor fastening part 130b and the accommodating part 162 beyond the outer diameter of the rotating shaft 130. It is formed of an exposed portion 161. In addition, the rib groove 163 to which the protrusion 131 of the fan shaft 130b is fitted is formed.

The exposed portion 161 of the anti-vibration rubber 160 is positioned above the outer surface of the upper case 101. This is because when the exposed part 161 of the anti-vibration rubber 160 is inside the motor, deformation may be caused by heat generated inside the motor. In addition, the accommodating part 162 of the anti-vibration rubber 160 is also preferably accommodated above the rotor shaft 130a in contact with the upper bearing 150. That is, it is preferable that the receiving groove 134 of the rotor shaft 130b is not formed to the part in contact with the upper bearing 101.

3 is a view showing a first embodiment of a rotating shaft according to the present invention.

The rotating shaft 130 is divided into the rotor shaft 130a and the fan shaft 130b to be coupled with the anti-vibration rubber 160 interposed therebetween. One end of the rotor shaft (130a) is formed with a receiving groove 134 for the anti-vibration rubber 160 is seated, the other end is a bearing portion 167 for fitting to the lower bearing 151 of the lower case 102 Is formed. The bearing part 167 fitted to the lower bearing 102 is formed smaller than the outer diameter of the rotor shaft 130a. A ring groove 132 is formed along the circumferential direction near the receiving groove 134 of the dustproof rubber 160, and the ring groove 132 is a position fixing ring 133 for fixing the position of the rotation shaft 130.

One end of the fan shaft 130b is formed with a protrusion 131 to be coupled through the accommodation groove 134 and the anti-vibration rubber 160 of the rotor shaft 130a. The other end of the fan shaft 130b is threaded to connect with the fan. The projection 131 of the fan shaft 130b is formed smaller than the outer diameter of the fan shaft 130b.

In order to combine the rotor shaft 130a and the fan shaft 130b, the dustproof rubber 160 may be inserted into the insert injection molding while maintaining the concentricity, or the dustproof rubber 160 may be manufactured first, and then combined using an adhesive means. . The anti-vibration rubber 160 has a cylindrical shape and is exposed to the outside by stepping with the accommodating part 162 or more than an outer diameter of the accommodating part 162 and the rotating shaft 130 seated in the accommodating groove 134 of the rotor shaft 130a. Exposed portion 161. The exposed portion 161 of the anti-vibration rubber 160 is formed with a hollow groove 163 into which the protrusion 131 is fitted, and the receiving portion 162 has a shape where one end is blocked. In addition, the anti-vibration rubber 160 may be formed with a hole. The anti-vibration rubber 160 supports the weight of the fan coupled to the other end of the fan shaft 130b, and when the rotation shaft 130 is rotated, there should be a hardness that the fan shaft 130b does not have to fall out of the anti-vibration rubber 160. do.

4 is a view showing a second embodiment of a rotating shaft according to the present invention.

The projection 131 ′ at the end of the fan shaft 130b facing each other with the receiving groove 134 of the rotor shaft 130a may be formed to be long and penetrate the dustproof rubber 160 to be inserted into the rotor shaft 130a. have. The anti-vibration rubber 160 is provided with a hollow hole 163 ′ so that the protrusion 131 ′ may pass through. At this time, the insertion groove 135 into which the protrusion 131 ′ of the fan shaft 130b is inserted is formed in the receiving groove 134 of the rotor shaft 130a.

When the protrusion 131 ′ is inserted into the insertion hop 135 of the rotor shaft 130a, the protrusion 131 ′ should have some clearance with the insertion groove 135. This is to prevent the vibration of the rotor shaft 130a from being directly transmitted to the fan shaft 130b. As such, by forming the insertion groove 135 in the accommodation groove 134 of the rotor shaft 130a and inserting the protrusion 131 'into the insertion groove 135, the fan shaft 130b and the rotor shaft 130a are It can be fixed more firmly.

5 is a view showing a third embodiment of a rotating shaft according to the present invention.

An accommodating groove 134b for accommodating the anti-vibration rubber 160 'is formed at an end portion of the fan shaft 130b facing the accommodating groove 134a of the rotor shaft 130a. The anti-vibration rubber 160 'has a cylindrical shape and includes a receiving portion 162 seated in the receiving groove 134a of the rotor shaft 130a and a receiving portion 162 seated in the receiving groove 134b of the fan shaft 130b. Is formed. In addition, each of the receiving portion 162 includes an exposed portion 161 exposed to the outside in step with the receiving portion 162 or more than the outer diameter of the rotating shaft 130. The anti-vibration rubber 160 'is inserted into the insert while maintaining concentricity to couple the rotor shaft 130a and the fan shaft 130b. Alternatively, it may be combined by a method of bonding the bonding means.

Usually, the rotation shaft 130 is made of carbon steel, and the rotor shaft 130a and the fan shaft 130b may use different materials. For example, the rotor shaft 130a may use carbon steel as it is, and the fan shaft 130b may use another material. In addition, there is an advantage that can reduce the production cost of the fan motor by using the fan shaft 130b as a plastic.

It is apparent to those skilled in the art that the present invention is not limited to the described embodiments, and that various modifications and changes can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations will be considered to belong to the claims of the present invention.

1 is a view showing a cross section of a fan drive motor for an air conditioner according to the prior art,

2 is a view showing a cross section of the fan driving motor according to the present invention;

3 is a view showing an embodiment of a rotation shaft of a fan driving motor according to the present invention;

4 is a view showing a second embodiment of a rotating shaft of a fan driving motor according to the present invention;

5 is a view showing a third embodiment of a rotation shaft of a fan driving motor according to the present invention.

Claims (11)

       A rotor having a permanent magnet coupled to an outer circumferential surface of the rotor core;        A stator positioned in a radial direction of the rotor and surrounding the rotor;       A rotation shaft including a rotor shaft press-fitted into the rotor and a fan shaft coupled concentrically to the rotor shaft and extending in the axial direction and fastened to the fan; And,       And a suction member which prevents transmission of vibration between the rotor shaft and the fan shaft.        The method of claim 1, The end of the rotor shaft facing each other with the end of the fan shaft forms a receiving groove for receiving the suction member, An end of the fan shaft facing the end of the rotor shaft to form a projection connected to the suction member to the fan shaft and the rotor shaft, characterized in that the fan shaft coupled to each other through the suction member. The method of claim 2, The suction member has a cylindrical shape, a receiving portion seated in the receiving groove of the rotor shaft, Fan drive motor, characterized in that it consists of an exposed portion exposed to the outside in step with the receiving portion beyond the outer diameter of the rotating shaft, the hollow shaft formed on the fan shaft side. The method of claim 3, Insertion groove is formed in the center of the receiving groove of the rotor shaft, A fan driving motor, characterized in that the projection of the fan shaft is formed long and is inserted into the insertion groove through the suction member. The method of claim 1, An end of the rotor shaft facing each other and the end of the fan shaft is formed with a receiving groove for accommodating the suction member, respectively. The method of claim 5, The suction member has a cylindrical shape, and includes a receiving part seated in the receiving groove of the rotor shaft and the fan shaft, and an exposed part exposed to the outside by stepping with the receiving part beyond the outer diameter of the rotation shaft between the respective receiving parts. Fan drive motor. The method according to any one of claims 1 to 6, The dust absorbing member is a dustproof rubber and the dustproof rubber is a fan drive motor, characterized in that the insert is injected into at least one of the rotor shaft and the fan shaft.        The method according to any one of claims 1 to 6,       The dust-proof member is a dust-proof rubber and the dust-proof rubber is coupled to any one or more of the rotor shaft and the fan shaft by the motor for driving the fan.  The method according to any one of claims 1 to 6, The fan shaft coupled to the fan and the rotor shaft pressed into the rotor is a fan drive motor, characterized in that the material is different.        10. The method of claim 9,       The material of the rotor shaft is carbon steel, and the fan driving motor, wherein the material of the fan shaft is plastic.        The method according to claim 3, 4 or 6, Upper and lower bearings positioned at upper and lower portions to rotatably support the rotating shaft; And, An upper case and a lower case forming an outer shape of the motor at the outer side of the bearing; Includes, the fan drive motor, characterized in that the exposed portion is located above the outer surface of the upper case.

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