JPS6141421Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to the structure of a drip-proof wound-rotor motor.

For example, in a conventional drip-proof wound type electric motor, as shown in FIGS. 1 and 2 in vertical cross-sectional views of the upper half of each, a stator core 4A is inserted into a stator frame 4, and the stator core 4A is inserted into the stator frame 4. 4A and the rotor core 8 is installed on the rotating shaft 12 through a desired gap, and bearings 13 and 14 are fitted to both ends of the rotating shaft 12, respectively, and the counter-load side and load side bearings are connected to each other through the bearings on both sides. It is rotatably supported on the brackets 1 and 3, and a collector cylinder is inserted into the rotating shaft 12 on the load side, and the collector ring 5 and the brush 6 are connected to each other.
In addition, a cooling fan 2 fitted to the rotating shaft 12 is provided in the end of the bearing bracket 1 on the opposite load side, and a ventilation window is provided in the bearing bracket 1 on the opposite load side on the exhaust side. 7 is opened to configure a drip-proof wound type electric motor, and the cooling air sucked in from the intake hole 3B of the load-side bearing bracket 3 is routed inside between the ribs of the stator frame 4 or through the rotor core 8. This is a one-way ventilation configuration in which cooling air is cooled through the air hole 8C to cool the current collecting ring device 6E section and is discharged from the ventilation window 7 of the anti-load side bearing bracket 1 by the cooling fan 2.
In the case of Fig. 2, the collector cylinder, collector ring 5, brush 6, and other current collecting ring devices 6E are installed in a compartment outside the motor body, and the ventilation structure inside the equipment is provided through the intake hole 3B of the load side bearing bracket 3. The sucked cooling air passes through the space between the ribs of the stator frame 4 or through the ventilation holes 8C of the rotor core 8 and is then sent to the cooling fan 2.
This provides a one-way ventilation configuration in which cooling air is discharged from the ventilation window 7 of the bearing bracket 7 on the anti-load side.

In the case of the conventional drip-proof wound type electric motor shown in FIG. 1, the stator core 4A containing the stator winding 9 is
A collector ring 5 and a brush 6 are coaxially adjacent to the provided rotor core 8 through a desired gap.
A current collector ring device 6E such as the above is provided, and in terms of dust resistance, since the brush 6 collects current with the current collector ring device 6E that presses the brush 6 against the rotating collector ring 5, carbon dust due to wear of the brush 6 is prevented. This is a problem in that it tends to adhere to the stator winding 9, rotor winding 10, etc. In addition, in the case shown in Fig. 2, the collector ring 5, brush 6, etc., are provided in a compartment outside the main body of the motor, so there is no problem with dustproofness, but there are other parts. A collector bracket 11, a collector cover 15, etc. are required, and the electric motor itself also extends in the axial direction, so when installing the electric motor in a machine, there are problems such as disadvantages if there is not enough space in the axial direction. Ta.

The present invention was developed in view of the above-mentioned circumstances, and provides a drip-proof wound-rotor motor structure that improves the conventional problems and has a dust-proof one-way ventilation configuration that contributes to improving the ventilation cooling function in equipment. The purpose is to do.

Next, an embodiment of the present invention will be described with reference to the drawings. However, the same parts as in the prior art described above will be designated by the same reference numerals and detailed explanations will be omitted. FIG. 3 is an upper half longitudinal sectional front view showing the structure of a drip-proof wound type motor according to an embodiment of the present invention, in which the stator core 4A is inserted into the stator frame 4 and the rotor The iron core 8 is fitted onto the rotating shaft 12 and rotatably supported by bearing brackets 1 and 3 on both sides through bearings 13 and 14 at both ends with a gap between the stator iron core 4A and the bearing bracket 1 on the opposite load side. Provided to extend in the axial direction. Thus, a cooling fan 2 is coaxially fitted and fixed adjacent to the rotor core 8 in the direction opposite to the load side, and an auxiliary fan 2D is provided on the back of the cooling fan, and the cooling fan 2 and the auxiliary On the discharge side by the fan 2D, there is a ventilation window 7 on the bearing bracket 1 on the anti-load side.
will be established. A current collecting ring device 6E such as a collector ring 5 and a brush 6 is provided at the shaft end on the anti-load side.
There is an intake hole 7C in the end wall of the bearing bracket 1 on the opposite load side.
will be established. That is, a drip-proof wound type electric motor is constructed in which a cooling fan 2 is provided to partition the rotor core 8 and the current collector ring device 6E.

Next, the functions and effects of the structure of the drip-proof wound wire motor according to the embodiment of the present invention will be described. With the above-described structure, the cooling air sucked in through the intake hole 3B of the load-side bearing bracket 3 by the rotation of the cooling fan 2 is distributed between the plurality of ribs provided in the stator frame 4 or through the passages of the rotor core 8. Wind hole 8
C, and is discharged from the ventilation window 7 of the bearing bracket 1 on the anti-load side.
At rotation D, the intake hole 7 of the bearing bracket on the anti-load side
Cooling air is sucked in from C and cools the collector ring 5, brush 6, etc. of the current collecting ring device 6E, and at the same time carbon brush dust is discharged together with the cooling air, and the dust is removed from the stator windings 9 and the rotating parts. This prevents carbon brush dust from entering the stator frame 4 of the child winding 10, prevents carbon brush dust from adhering to the winding, and avoids deterioration of the characteristics of the winding. Due to the configuration in which the collector ring 5, brush 6, and other current collecting ring device 6E are isolated inside the main body via the cooling fan 2, the dimensions in the axial direction are reduced compared to the conventional structure in which the collector ring 5, brush 6, etc. are provided in a compartment outside the main body. It is possible to provide a drip-proof wound-rotor motor having remarkable features such as reduced size and improved functional characteristics.

[Brief explanation of the drawing]

1 and 2 are longitudinal front views of the upper half of a drip-proof wound-rotor motor showing other conventional examples, and FIG. 3 is a longitudinal sectional view of the upper half of a drip-proof wound-rotor motor showing an embodiment of the present invention. It is a front view. 1... Anti-load side bearing bracket, 2... Cooling fan, 2D... Auxiliary fan, 3... Load side bearing bracket, 3B... Intake hole, 4... Stator frame,
4A... Stator core, 6E... Current collector ring device, 7...
...Ventilation window, 7C...Intake hole, 8...Rotor core,
12... Rotating shaft, 13, 14... Bearings on both sides.

Claims (1)

[Scope of utility model registration request] A stator core with stator windings is inserted into the stator frame, and the rotor core with rotor windings faces the inner diameter of the stator core through a gap, and the rotor core with rotor windings is placed on the outside and the rotor windings. A current collector ring that transfers power between the stator and the stator frame is inserted into the rotating shaft, and rotatably supported by bearing brackets fitted on both sides of the stator frame via bearings fitted on both ends of the rotating shaft. In the wound type electric motor, a cooling fan with an auxiliary fan on the back side is installed between the rotor core of the rotating shaft and the collector ring to partition the rotor core and the current collector ring device. A ventilation window for exhaust air is provided in the bearing bracket near the outer periphery, and intake holes for the rotor core and the current collector ring are opened in each of the bearing brackets on both sides, allowing ventilation cooling with individual cooling air. A drip-proof wound-rotor motor.