KR20060068928A - Bldc motor for driving a cooling fan for use in a car - Google Patents

Abstract

The present invention relates to a vehicle cooling fan drive BCD motor, the cooling fan motor (1) is a rotor that is connected to the front and rear of the cylindrical body (2a), respectively, the connecting shaft (2b) and is rotated by applying a DC drive voltage A rotating part consisting of a shaft 2 and a magnet 3 which is tightly fixed in a state surrounding the outer peripheral surface of the body 2a of the rotor shaft 2; and being fixed to the outside of the magnet 3 of the rotating part, A plurality of slots 4a are formed along the stator cores 4, in which coils are wound around the slots 4a, and the front cover 5 installed to accommodate the front of the rotating part including the stator cores 4, respectively. And a fixing part formed of a rear cover 6 having a flange 6b formed at its center and a stage 6a formed at its engaging portion for engaging with the rear end of the front cover 5. Because it is a composition without a brush and a commutator Since no noise is generated, it is possible to reduce the noise of the motor, improve the efficiency and weight of the motor by simplifying the motor parts, and apply the current value to 1/3 level when switching to the 42V system system of the vehicle power supply. It can be lowered to reduce the cost of power devices.

Vehicle, cooling fan, motor, brushless

Description

BLDC motor for driving a cooling fan for use in a car}

1 is a perspective view showing the appearance of a vehicle cooling fan motor according to the present invention;

Figure 2 is an exploded perspective view showing the components of the vehicle cooling fan motor according to the present invention,

3 is a perspective view showing the internal structure of a cooling fan motor according to the present invention;

4 is a cross-sectional view showing an assembled state of a cooling fan motor according to the present invention;

5 is a perspective view showing a rotor shaft of a cooling fan motor according to the present invention;

6 is a perspective view showing a front cover and a rear cover of a cooling fan motor according to the present invention;

7 is a perspective view showing a PCB plate of the cooling fan motor according to the present invention.

Explanation of symbols on the main parts of the drawings

1: cooling fan motor 2: rotor shaft

2a: body 2b: connecting shaft

2c: assembly groove 3: magnet

4: Stator Core 4a: Slot

5: Front cover 5a: Fixed end

5b: connection member 6: rear cover

6a: 6b: flange

6c: Drawout groove 7: Bearing

8: washer 9: PCB plate

9a: Hall element sensor 10: fan coupler

11: heat dissipation hole

The present invention relates to a motor for driving a cooling fan of a vehicle. In particular, the brush and the commutator constituting the existing DC motor has been developed to be applicable to the power supply of the 42V vehicle to eliminate the motor and to extend the life of the motor. The present invention relates to a vehicle cooling fan drive BCD motor capable of reducing weight through high efficiency and low volume.

In general, a vehicle equipped with an air conditioner affects vehicle performance due to an increase in weight and a decrease in heat dissipation caused by a condenser.In order to solve a decrease in vehicle performance, a cooling fan is attached to a condenser installed at the front of the vehicle. The fan motor is installed to drive the cooling fan.

The fan motor conventionally used is a 14V system, which is a brushed DC motor. The efficiency of this motor is up to 70%, the driving speed is about 2,000 RPM, and most of the motors are used in domestic and overseas. The DC motor is configured by using a permanent magnet as a stator and using a coil as a rotor (armature), and is a motor that generates rotational force by repulsion and suction force of magnetic force by changing the direction of current flowing through the rotor.

By the way, the conventional DC motor as described above has a limitation in the lifespan because the brush is installed, the electrical noise is generated due to the presence of the brush and the commutator of the DC motor and the noise is high. The limitation of high efficiency and low weight of motor due to brush and commutator is limited, and fan motor in 14V low voltage system cannot be replaced by brushless DC motor because brush current is very large in 14V low voltage system. In the DC motor, the cost is increased due to the increase in the current capacity of the essential power semiconductor device.

Meanwhile, in recent years, the automotive power system has led to the development of the 42V high voltage system in accordance with the various demands of consumers such as stability, convenience, and ride comfort, and the low-economy environment. The development of technology related to electric motors as core driving parts according to the system is insufficient.

Accordingly, the present invention has been devised in view of the above-described circumstances, and has been developed to be applicable to a 42V vehicle power supply with a brush and a commutator constituting an existing DC motor removed, thereby extending the life of the motor and the motor. It is an object of the present invention to provide a vehicle cooling fan drive BCD motor that can be reduced in weight through high efficiency and low volume.                         

The present invention for achieving the above object, the connecting shaft is formed in each of the front and rear of the cylindrical body as well as the rotor shaft is rotated by applying a DC power, and is fixed in a state surrounding the outer peripheral surface of the rotor shaft body A rotating part made of a magnet; and a stator core inserted into and fixed to an outer side of the magnet and having a plurality of slots formed in a circumferential direction such that a coil is wound around the slot, and a front of the rotating part including the stator core. The front cover is installed so as to be coupled to the rear end of the front cover and the end is formed in the engaging portion and the fixing portion consisting of a rear cover formed with a flange in the center thereof.

And, assembling grooves are divided into four equal parts in the circumferential direction of the outer circumferential surface of the rotor shaft, each piece of the magnet divided into quarters with respect to the assembly groove can be assembled to the body of the rotor shaft.

In addition, a plurality of heat dissipation holes are formed in the side portions of the front cover and the rear cover, respectively, and a fixed end is formed on the inner side of the front cover to hold the concentricity when the state core is coupled.

The triangular fan coupler for fixing the cooling fan is fixed to the front connecting shaft of the rotor shaft, the PCB is attached to the plurality of Hall element sensor is installed on the flange of the rear cover is rotated by the Hall element sensor The position of the rotor can be detected.

Bearings are installed in the assembling portions of the front cover and the rear cover to which the front and rear connecting shafts of the rotor shaft are assembled, and a washer is installed in the play between the bearing and the rotor shaft.

That is, the motor having the above structure is a cooling fan motor to be applied to the 42V automotive system system, and the type of motor is a brushless DC motor, and is a brushless DC motor. The rotating part of the motor is a magnet surrounding the rotor shaft and the rotor shaft, and the fixing part of the motor is composed of the front cover, the rear cover and the stator core.

Therefore, since the vehicle cooling fan motor has a brushless configuration of a conventional DC motor, the service life of the motor is increased, and since the configuration does not include a brush and a commutator, it is possible to reduce the noise of the motor as electrical noise does not occur, By simplifying the motor, the efficiency and weight of the motor can be reduced, and when switching to the 42V system system of the vehicle power supply, the applied current value can be reduced to about 1/3, thereby reducing the cost of the power device.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing the appearance of a vehicle cooling fan motor according to the present invention, Figure 2 is an exploded perspective view showing the components of the vehicle cooling fan motor according to the present invention, Figure 3 is a cooling fan motor according to the present invention 4 is a cross-sectional view illustrating an assembly state of a cooling fan motor according to the present invention, FIG. 5 is a perspective view showing a rotor shaft of a cooling fan motor according to the present invention, and FIG. 7 is a perspective view illustrating a front cover and a rear cover of a cooling fan motor according to the present invention, and FIG. 7 is a perspective view illustrating a PCB plate of a cooling fan motor according to the present invention.

The cooling fan motor 1 for a vehicle according to the present invention includes a rotor shaft 2 and a rotor shaft which are rotated by applying a DC driving voltage and protruding the connecting shaft 2b in front and rear of the cylindrical body 2a, respectively. 2) the body (2a) of the rotating part consisting of a magnet (3) is tightly fixed in a state surrounding the outer circumferential surface; and a plurality of slots (4a) is formed along the circumferential direction and fixed to the outside of the magnet (3) of the rotating part And a front cover (5) provided to accommodate the front of the stator core (4) to which the coil is wound around the slot (4a), the rotating part including the stator core (4), and the front cover (5). In order to be coupled to the rear end, the end portion (6a) is formed in the engaging portion and the fixing portion consisting of a rear cover (6) formed with a flange (6b) in the center thereof.

Here, the features of the cooling fan motor (1) having the above structure is that the motor can be applied to the 42V automotive system system, the type of motor is a brushless DC motor, and is a civil-type BLDC (Brushless DC) motor.

The detailed specification of the cooling fan motor 1 has a rated output of 150W, a drive voltage of DC42V, a maximum motor efficiency of 80%, a rated speed of 2,000 RPM, and a size of Ø102mm * 70mm.

That is, the overall configuration of the cooling fan motor 1 is shown in Figs. 1 and 2, the rotating part of the cooling fan motor 1, the magnet (3) surrounding the rotor shaft 2 and the rotor shaft (2) ), And the fixing part of the cooling fan motor 1 is composed of the front cover 5, the rear cover 6, and the stator core 4.

In addition, a bearing 7 and a washer 8 are respectively installed on each connecting shaft 2b of the rotor shaft 2 to drive the cooling fan motor 1 smoothly, and the PCB for detecting the position of the rotating part is installed. The plate 9 is installed, and the fan coupler 10 for attaching the cooling fan is installed.

Therefore, the assembling structure of the vehicle cooling fan motor 1 is as shown in Figs. 3 and 4, the cooling fan motor 1 is an electric shock-type BLDC motor in which the rotor shaft 2 rotates, the rotor Bearings 7 are provided on the front cover 5 and the rear cover 6 respectively assembled on the outside of the shaft 2 so that the bearings 7 are inserted into the front and rear connecting shafts 2b of the rotor shaft 2. The rotation of the motor rotating portion is smoothed, and a washer 8 is installed at each of the clearances between the rotor shaft 2 and the bearing 7.

The installation of the washer 8 reduces the interference friction between the rotor shaft 2 and the bearing 7 and gives a preload to prevent axial shaking of the rotor shaft 2.

The front cover 5 and the rear cover 6, which are covers covering the rotating part, have a fixed end 5a formed inside the front cover 5 to smoothly assemble the assembly and to hold concentricity during assembly. The outer flange portion of the rear cover 6 is formed with a stage (6a) for assembly with the front cover (5).

On the other hand, as shown in Figure 5, the rotor shaft 2 is formed with an assembling groove (2c) each divided into four equally in the circumferential direction of the outer peripheral surface of the body (2a), divided into four equal to the assembling groove (2c) Each piece of the magnet 3 can be assembled to the body 2a of the rotor shaft 2, and can facilitate positioning through the assembly groove 2c when the magnet 3 is attached. It is.

The reason for increasing the outer diameter of the body 2a of the rotor shaft 2 to which the magnet 3 is attached is to improve the balancing of the motor rotation part and to be advantageous for constant speed operation.

And, as shown in Figure 6, the front cover 5 and the rear cover 6 forming the fixing portion, a plurality of heat dissipation holes 11 in the side portions of the front cover 5 and the rear cover 6, respectively Is formed, the fixed end (5a) is formed on the inner side of the front cover 5 to hold the concentricity when the stator core (4) is coupled.

The heat dissipation hole 11 improves the cooling performance against heat generation of the cooling fan motor 1, and also installs a connection member 5b spaced 120 ° outside the front cover 5 to the condenser of the vehicle. The cooling fan motor 1 is coupled to each other, and a protruding flange 6b is formed at an inner central portion of the rear cover 6 to fix the PCB plate 9, and a withdrawal groove is formed at one side of the rear cover 6. 6c) is formed so that the wiring can pass through the lead-out groove (6c).

In addition, in the case of the magnet 3 assembled to the rotor shaft 2, a ferrite sintered magnet is used, and as described above, the magnet 3 is divided into four parts in order to improve assembling with the rotor shaft 2. It is to be assembled in accordance with the assembly groove (2c) formed in the body (2a) of the shaft (2).

Here, the triangular fan coupler 10 for fixing the cooling fan is fixed to the front connecting shaft 2b of the rotor shaft 2, and the fan coupler 10 is formed of aluminum. In order to reduce the inertia and the weight of the cooling fan motor 1, the cooling fan has a shape of a tripod.

On the other hand, the stator core (4) inserted into the outer side of the rotating part is a component that forms a magnetic path while maintaining the coil body, is assembled and fixed to the front cover (5) of the cooling fan motor (1). The number of slots 4a of the stator core 4 is 12, and a coil is wound around the slot 4a of the stator core 4 to form a coil body. In order to form a coil body in one slot 4a, the coil is made up of 65 turns of coils having a diameter of 0.7 mm.

In addition, the PCB plate 9 assembled to the rear cover 6 has a Hall element sensor 9a installed on one surface of the PCB plate 9 as shown in FIG. 7 and the magnet 3 and the rotor shaft. It detects the position of (2) and energizes the coil element to play a role of changing phase. The PCB plate 9 is attached to the rear cover 6 to detect the rotational position of the Hall element sensor 9a at a predetermined distance from the magnet 3. Three Hall element sensors 9a are attached to the PCB plate 9 at intervals of 120 °.

In addition, the bearing 7 installed on the cooling fan motor 1 is assembled to the front cover 5 and the rear cover 6, and smoothly rotates the rotor shaft 2 by using a ball bearing. The washer 8 serves to reduce interference friction between the rotor shaft 2 and the bearing 7 of the rotary part by installing a spring washer at the clearance between the rotor shaft 2 and the bearing 7. Preload is applied to prevent axial shaking of the fan motor 1.

Therefore, the vehicle cooling fan motor 1 having the above-described structure can be applied to an optimal 42V system by reducing the efficiency and weight of the vehicle, and improving the vehicle performance in the 42V high voltage system. ) Can be increased.

As described above, the vehicle cooling fan driving BCD motor according to the present invention has a brushless configuration of a conventional DC motor, which increases the life of the motor, and does not generate electric noise because the configuration does not include a brush and a commutator. Therefore, it is possible to reduce the noise of the motor, improve the efficiency and weight of the motor by simplifying the motor parts, and reduce the applied current value to 1/3 level when switching to the vehicle power supply 42V system system. There is an effect that can reduce the cost.

Claims (6)

A rotor shaft having a connecting shaft protruding from the front and rear of the cylindrical body and being rotated by applying a DC driving voltage, and a rotating part made of a magnet that is tightly fixed while covering the outer circumferential surface of the rotor shaft; and A stator core inserted into and fixed to the outside of the magnet of the rotating part and formed with a plurality of slots along the circumferential direction so that the coil is wound around the slot; And a fixed part formed of a rear cover having a flange formed at a center thereof and coupled to a rear end of the front cover. According to claim 1, wherein the assembling grooves are divided into four equally in the circumferential direction of the outer peripheral surface of the rotor shaft, each piece of the magnet divided into quarters with respect to the assembly groove can be assembled to the body of the rotor shaft Vehicle cooling fan drive BCD motor, characterized in that. The vehicle cooling fan of claim 1, wherein a plurality of heat dissipation holes are formed in side portions of the front cover and the rear cover, respectively, and fixed ends are formed on the inner side of the front cover to secure concentricity when the state core is coupled. Driven BC motors. The vehicle cooling fan driving BCD motor of claim 1, wherein a triangular fan coupler is fixedly installed on a front connecting shaft of the rotor shaft to install a cooling fan. The vehicle cooling fan of claim 1, wherein a PCB plate having a plurality of Hall element sensors is installed on the flange of the rear cover to detect a position of the rotor rotated by the Hall element sensor. BCD motor. 2. The vehicle cooling fan according to claim 1, wherein bearings are respectively provided at the assembling portions of the front cover and the rear cover to which the front and rear connecting shafts of the rotor shaft are assembled, and washers are installed at the clearance between the bearing and the rotor shaft. Driven BC motors.

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