JPH10290552A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor in which temperature rise can be suppressed by ensuring a plenty of air flow for cooling the motor in the limited inner space thereof. SOLUTION: A coil 3 is wound around each pole 2 of a core 1 to form a rotor 4 which is provided with a fan 9 for cooling the inside such that the blades 10 of the fan 9 does not touch the rotor 4. The blade 10 of the fan 9 is formed to partially extend through a gap between the coils 3 wound around the poles 2 between the poles 2 of the core 1. Since the blade 10 of the tan 9 partially extends through the gap between the coils 3a to form an extended part 26, the area of the blade 10 can be increased at that part and a plenty of air flow for cooling the motor is ensured, thus suppressing temperature rise of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan for cooling a motor and a structure for holding the fan.

[0002]

2. Description of the Related Art FIG. 5 shows a structure of a rotor portion of a conventional motor. A rotor 3 is formed by winding a coil 3 around the pole 2 of the iron core 1, and is provided integrally with the center of the rotor 4 so as to penetrate the rotating shaft 5. A commutator 7 is provided on the outer periphery of the sleeve 6 of the rotor 4, and the terminal 8 of the commutator 7 is connected to the terminal wire 3 a of the coil 3. A fan 9 for cooling by blowing air is mounted on the outer periphery of the sleeve 6. The fan 9 is provided with a plurality of blades 10 in the circumferential direction. Each of the blades 10 has the same shape, and each of the blades 10 has a notch 11 to avoid the coil 3.

[0003]

In the above-mentioned conventional example, since the plurality of blades 10 have the shape having the notch 11 to avoid the coil 3, the area of the blades 10 is small and the air volume to be blown is small. And there is a problem that cooling cannot be performed effectively. The present invention has been made in view of the above description, and has as its object to provide a motor capable of securing a large amount of air for cooling the motor in a narrow space inside the motor and suppressing a temperature rise of the motor. As an issue.

[0004]

According to a first aspect of the present invention, there is provided a motor for winding a coil around each pole of an iron core to form a rotor and a fan for cooling the inside of the motor. In the rotor provided so that the blade does not contact the coil, a part of the fan blade is formed between the poles of the iron core and extends to the gap between the coils wound around the pole. It is characterized by comprising. By extending a part of the fan blades into the gap between the coils to form an extended part, the area of the blades in this part can be increased, and the amount of air for cooling the motor is increased to increase the temperature of the motor Can be suppressed.

[0005] The motor according to claim 2 of the present invention is characterized by claim 1
Wherein the extended portion of the fan blade is brought into contact with a terminal of the commutator. The positioning of the fan in the radial direction can be performed, and the fan outer diameter can be increased to just below the casing inner diameter, so that a large air volume can be secured. A motor according to a third aspect of the present invention is characterized in that, in the first or second aspect, the fan is provided with a rib for supporting a terminal of the commutator. The positioning in the rotation direction of the fan can be performed, and the assembling workability can be improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the embodiment shown in FIGS. 1 and 2 will be described. The rotor 4 of the motor A is formed by winding a coil 3 around a plurality (three) of the poles 2 of the iron core 1.
The center of the rotor 4 is integrally provided so as to penetrate the rotating shaft 5. The casing 13 of the motor A has a cylindrical casing body 13a with a closed bottom and a casing body 1 for closing the rear end.
And a bracket 13b for closing the opening at the front end of 3a. The opening of the casing body 13a is closed by the bracket 13b, and the bracket 13b is fixed by caulking the caulking piece 14. A plurality of (two in this example) stator magnets 15 are mounted on the inner surface of the casing 1, and the rotor 4 is disposed inside the stator magnets 15 in the casing 1, and the rotation shaft 5 is It is attached so that it penetrates. The rear end of the rotary shaft 5 is rotatably supported by a bearing 16 at the rear of the casing 1, and the front end of the rotary shaft 4 is rotatably supported by a bearing 17 such as a bearing of a bracket 13b. is there. A commutator 7 is mounted on the sleeve 6 provided on the front end side of the rotor 4, a brush 18 is in contact with the commutator 7, and a terminal plate 19 for supplying power to the brush 18 is provided outside the casing 1. It is. The commutator 7 is provided with a terminal 8 for supplying power to the coil 3, and the terminal wire 3 a of the coil 3 is caulked and fixed to the terminal 8. A fan 9 such as a centrifugal fan is mounted on the front side of the rotor 4 so as to be located on the outer periphery of the sleeve 6. An intake port 19 is provided at a rear end of the casing 1, an intake port 20 is provided at a bracket 13 b at a front end of the casing 1, and an exhaust port 21 is provided at the casing 1 at a position corresponding to the outer periphery of the fan 9. It is. Fan 9 is the outer ring 2
2 and an inner ring 23 and a plurality of (six in this example) blades 10 provided radially. Every other blade 10 corresponding to the coil 3 of the rotor 4 is provided with a notch 11 so as to avoid the coil 3, and every other blade 10 corresponding to the iron core opening 25 between the poles 2 of the rotor 4. Is provided with an extending portion 26 extending into the iron core opening 25 so as to be located between the coils 3. The extending portion 26 is provided so as to reach the front end surface of the iron core 1 and to be close to the outer periphery of the sleeve 6.

When power is supplied to the terminal board 19, the rotor 4 is driven to rotate and the rotating shaft 4 is driven to rotate. At this time, the fan 9 is driven to rotate together with the rotor 4. When the fan 9 is driven to rotate, air is sucked in from the intake port 19 and the intake port 20, and is blown so as to be exhausted from the exhaust port 21. The air sucked in from the air inlet 19 is blown so as to flow through a gap or the like between the rotor 4 and the stator magnet 15 and is cooled. At this time, since every other three blades 10 among the plurality of blades 10 of the fan 9 have the extended portions 26, the area thereof is large and the amount of air to be blown can be increased, and the amount of air can be increased to cool effectively. .

FIG. 3 shows another example of the embodiment. This example is also basically the same as the examples shown in FIGS. 1 and 2, and only different points will be described. Also in the case of this example, the extension portion 26 is provided on every third blade 10, but the end on the inner peripheral side of the extension portion 26 is connected to the terminal 8, and the extension portion 26 The inner peripheral end is in contact with the terminal 8 to position the inner peripheral side. By doing so, the fan 9 can be positioned in the radial direction, and the outer diameter of the fan 9 can be increased to just below the inner diameter of the casing 1.

FIG. 4 shows another example of the embodiment. This example is also basically the same as the examples shown in FIGS. 1 and 2, and only different points will be described. Also in the case of this example, the extending portions 26 are provided on every other three blades 10, but a pair of ribs 27 are provided on the inner peripheral end of the extending portions 26 at intervals of the terminals 8. The rib 27 is fitted to the terminal 8 so as to straddle the terminal 8 with a pair of ribs 27. By doing so, the fan 9 can be positioned in the rotation direction, so that the assembling workability can be improved.

[0010]

According to the first aspect of the present invention, a part of the blade of the fan is formed to extend between the poles of the iron core and into the gap between the coils wound around the poles. Therefore, by extending a part of the fan blades into the gap between the coils to form an extended part, the area of the blades in this part can be increased, and a large air volume for cooling the motor is secured. The temperature rise can be suppressed, and the output per physique can be increased.

[0011] The invention of claim 2 of the present invention relates to claim 1
In the above, the extended portions of the fan blades are brought into contact with the terminals of the commutator, so that the fan can be positioned in the radial direction, and the fan outer diameter can be increased to just below the casing inner diameter, and a large air volume can be secured. It is. According to a third aspect of the present invention, in the first or second aspect, the ribs for supporting the terminals of the commutator are provided on the fan, so that the fan can be positioned in the rotational direction and the assembly workability can be improved. Things.

[Brief description of the drawings]

1A and 1B show a rotor portion according to an embodiment of the present invention, in which FIG. 1A is a partially cutaway front view, and FIG. 1B is a right side view.

FIGS. 2A and 2B show the entire motor, in which FIG. 2A is a partially omitted sectional view, FIG. 2B is a left side view, and FIG. 2C is a right side view.

3A and 3B show a rotor part of another example of the above, wherein FIG. 3A is a partially cutaway front view, and FIG. 3B is a right side view.

4A and 4B show a rotor part of another example of the above, wherein FIG. 4A is a partially cutaway front view, and FIG. 4B is a right side view.

5A and 5B show a conventional rotor portion, in which FIG. 5A is a partially cutaway front view, and FIG. 5B is a right side view.

[Explanation of symbols]

 A Motor 1 Iron core 2 Pole 3 Coil 4 Rotor 9 Fan 10 Blade 26 Extension 27 Rib

Claims (3)

[Claims] 1. A motor in which a coil is wound around each pole of an iron core to form a rotor, and a fan for cooling the inside is provided on the rotor such that the blade of the fan does not contact the coil. A motor characterized in that a part thereof is formed between a pole of an iron core and extends in a gap between coils wound around the pole. 2. The motor according to claim 1, wherein the extended portion of the fan blade is brought into contact with a terminal of the commutator. 3. The motor according to claim 1, wherein a rib for supporting a terminal of the commutator is provided on the fan.