JPH0553186U - Wire wound type motor slip ring polishing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a slip ring polishing device for a wire-wound motor. [Structure] A grindstone holder 11 slidably holding a grindstone 15 having a width wider than the width of the slip ring 2, and the grindstone 15 on the grindstone holder 11 is applied with a predetermined pressing force on the slip ring 2 surface. By attaching a grindstone pressing mechanism 16 that presses with and a grinding allowance adjusting mechanism 19 that adjusts the grinding allowance of the slip ring 2 and connecting the brush holder 3 at a predetermined angle, a step is formed to a predetermined depth while rotating the electric motor. -Free polishing can be performed.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a slip ring polishing device for a wire-wound motor.

[0002]

[Prior Art]

 As shown in FIG. 4, in a conventional wire-wound electric motor, a brush 4 held by a brush holder 3 is brought into contact with a slip ring 2 provided on a shaft 1 of a rotor while being pressed by a brush pressing fitting 5. Is configured to supply current to the three-phase winding of the rotor. A secondary wiring 7 is connected to the brush holder 3 via a connecting bolt 6.

Incidentally, the surface of the slip ring 2 provided in such a wound electric motor is often roughened during operation due to vibration, impact, ambient temperature, or the like. If the surface of the slip ring 2 becomes rough, remove one of the brushes 4 in the brush holder 3 and insert a grinding stone of the same size as the brush 4 and pressurize it with the brush holder 5 or While holding down with a special jig, rotate the electric motor to polish. Alternatively, an operator may hold a grindstone or a file with his / her hand and directly press it against the surface of the slip ring 2 to grind while rotating the electric motor.

[0004]

[Problems to be solved by the device]

 However, when the polishing wheel is attached to the brush holder 3 to polish the slip ring 2, there are the following drawbacks. That is, the width of the brush 4 is usually smaller than the width of the slip ring 2, and therefore the width of the grinding wheel is also narrower than that of the slip ring 2. Will be stepped at both ends of the brush, and there will be no adjustment function of the polishing allowance to easily cause excessive polishing. For example, even if three slip rings 2 are to be polished at the same time, due to the current carrying capacity, etc. It is only possible to remove the slip rings 2 one by one, so the slip rings 2 must be polished one by one, which takes time. Of these three problems, the fatal one is particularly fatal, and the operator is forced to press down on the steps at both ends with a grindstone or a file, so there is a great risk of electric shock or involvement. ..

As a means for improving such a defect, for example, as disclosed in Japanese Utility Model Laid-Open No. 57-41474, 0.2% is added to metallic carbon having protrusions on both lower sides and divided in the width direction. A means for polishing the surface of the slip ring by using a polishing brush mixed with silica sand has been proposed. However, with this polishing means, the distance between the brush of the electric motor and the slip ring is usually only about 2 to 3 mm, and therefore, even if the width of the grindstone in the portion that hits the slip ring is widened, it is only about 2 to 3 mm. Therefore, the life of the grindstone is extremely short, and the above problems are not solved.

An object of the present invention is to provide a slip ring polishing apparatus for a wire-wound electric motor, which solves the above problems of the prior art.

[0007]

[Means for Solving the Problems]

 The present invention is a device for polishing a slip ring of a wire-wound electric motor that supplies current to a rotor winding by contacting a brush held by a brush holder, and has a width wider than the width of the slip ring. An abrasive grindstone, a grindstone holder connected to the brush holder at a predetermined angle to slidably hold the abrasive grindstone, and fixed on the grindstone holder to hold the abrasive grindstone on the slip ring surface at a predetermined angle. A slip ring polishing device for a wire-wound electric motor, comprising: a grindstone pressing mechanism that presses with a pressing force; and a grinding stock adjustment mechanism that is mounted on the grindstone holder and that adjusts the grinding stock of the slip ring. is there.

[0008]

[Work]

 According to the present invention, the grinding wheel having a width slightly larger than the width of the slip ring is used, and the grinding wheel holder capable of storing the grinding wheel is connected to the brush holder at a predetermined angle. It can be polished flat so that there are no steps. In addition, since a grindstone pressing mechanism is provided, the pressure of the grinding wheel that is pressed against the slip ring can be adjusted, and a polishing allowance adjustment mechanism is added to prevent excessive polishing. be able to.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing an embodiment of a slip ring polishing apparatus of the present invention, and FIG. 2 is a plan view thereof. In the figure, reference numeral 11 is a T-shaped grindstone holder having a base portion 12 and a connecting portion 13. An end portion 13a of the connecting portion 13 is bent at a predetermined angle θ, and the end portion 13a has a connecting hole. 14 are provided. Reference numeral 15 is a grinding wheel, and its width w is made slightly wider than the width of the slip ring 2. Reference numeral 16 is a grindstone pressing mechanism that is fixed to the base 12 of the grindstone holder 11 and presses the grinding grindstone 15.The pressing force of the leaf spring 17 is adjusted by stepwise changing the locking position of the pressing force adjustment lever 18. can do. Reference numeral 19 is a polishing allowance adjusting mechanism which adjusts the height of the leaf spring 17 to adjust the polishing allowance of the slip ring 2. For example, the height h can be arbitrarily adjusted by using a bolt 19a and a nut 19b in combination. You can

As shown in FIG. 3, the slip ring polishing apparatus 10 configured as described above is connected to the end portion of the brush holder 3 through the connecting hole 14 of the connecting portion 13 using the connecting bolt 6 and the like. To do. Then, one surface of the grinding wheel 15 is pressed against the slip ring 2, and the pressing force adjusting lever 18 is adjusted so that the leaf spring 17 comes to a position where the grinding wheel 15 is pushed. Here, when it is necessary to set the polishing allowance of the slip ring 2, if the height h of the polishing allowance adjusting mechanism 19 is adjusted in advance, the leaf spring 17 is locked at that position. After that, the force for pushing the grinding wheel 15 disappears, and the grinding allowance is adjusted. Further, the polishing grindstone 15 can be repeatedly used up to the adjustable range of the pressing force adjusting lever 18.

The slip ring polishing apparatus 10 of the present invention was used to polish the slip ring of a 75 kW wire-wound electric motor. When a grinding wheel with a width of 22 mm for the slip ring and a width of 35 mm was used to polish for about 30 minutes at the weakest pressure, a highly accurate polished surface could be obtained. Since the entire size of the slip ring polishing apparatus 10 is approximately proportional to the capacity of the electric motor, any wire wound electric motor of 40 kW or more can be manufactured and used according to its capacity.

[0012]

[Effect of the device]

 According to the slip ring polishing apparatus of the present invention, since a wide grinding stone is used, it is possible to obtain a highly accurate polishing surface without forming a step at both ends of the slip ring surface, thereby saving labor. be able to. Further, since the polishing stock removal adjusting function is added, excessive polishing can be prevented, and further, three slip rings can be simultaneously polished, so that the efficiency of the polishing operation can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a slip ring polishing device of the present invention.

FIG. 2 is a plan view showing an embodiment of a slip ring polishing device of the present invention.

FIG. 3 is a side view illustrating a state in which the slip ring polishing device of the present invention is attached to a wire-wound electric motor.

FIG. 4 is a side view showing a slip ring portion of a conventional wire-wound electric motor.

[Explanation of symbols]

 2 Slip ring 3 Brush holder 4 Brush 5 Brush holding metal fitting 6 Connection bolt 10 Slip ring polishing device 11 Grinding stone holder 13 Connecting part 15 Polishing grindstone 16 Grinding stone pressing mechanism 17 Leaf spring 18 Pressurizing force adjusting lever 19 Polishing allowance adjusting mechanism

Claims (1)

[Scope of utility model registration request] 1. A device for polishing a slip ring of a wire-wound electric motor which contacts a brush held by a brush holder and supplies a current to a rotor winding, the device having a width wider than the width of the slip ring. Abrasive grindstone, a grindstone holder connected to the brush holder at a predetermined angle to slidably hold the grindstone, and the grindstone fixed on the grindstone holder to press the grindstone against the slip ring surface with a predetermined pressure. 2. A slip ring polishing apparatus for a wire-wound electric motor, comprising: a grindstone pressing mechanism that is pressed by means of;