JPH0723973U - Capacitor mounting structure for small motors - Google Patents

Abstract

(57) [Abstract] [Purpose] A circuit pattern is molded to form a capacitor holding part that fixes the capacitor during processing and, if desired, part of the circuit pattern is formed to have a structure bent toward the insulating material. A commutator device having a good dynamic balance is obtained by arranging and molding it inside the mold insulator. [Structure] The substrate has a circuit pattern 32 provided on one surface, an insulating material 31 on the other surface, and a capacitor holding portion 34 formed on the upper surface thereof. The capacitor 32 for spark elimination is attached to the holding portion 34 to form the pattern 32. At the same time, the commutator riser 4 and the pattern 32 are connected to connect the commutator and the capacitor. Further, the circuit pattern at the portion where the riser 4 connected to one segment of the commutator 2 and the circuit pattern connected to the riser connected to the other segment intersect is bent toward the substrate side to form a pattern bent portion 35 for insulation. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 It relates to a commutator device that uses a capacitor as an arc extinguishing element when commutating a small motor.

[0002]

[Prior art]

 In a motor that performs commutation with a brush, when the brush and commutator segments switch, electric discharge occurs and electrical noise occurs. In order to suppress this electric noise, there are some that use a capacitor as an arc extinguishing element. FIG. 4 shows a conventional example of a commutator device including a motor drive unit that uses a capacitor as an arc extinguishing element. In the figure, a circuit pattern connected to a core 1 and a coil 16 which constitute a drive unit connected to a rotary shaft 14 and a capacitor 1 arranged in a slot of the core and a segment 17 and 18 of a commutator 2 are connected. It is composed of a substrate 3 forming 9 and is rotatable together with the above-mentioned drive unit via a rotary shaft 14, and electric power is supplied from a brush (not shown) to the segments 17 and 18 to drive the rectifier device.

FIG. 5 is another conventional example showing the details of the commutator device. FIG. 5A is a plan view and FIG. 5B is a side view. The circuit pattern 9 is formed on the printed circuit board 3 such as a phenol or glass epoxy resin substrate, and the capacitor 1 is soldered 19 to the circuit board and fixed. Then, the commutator 2 is inserted into the opening formed in the board, fitted and fixed, and then the board 3 and the riser 4 are fixed with a paddle 20 to form a commutator device, and the capacitor 1 is connected to the circuit pattern. Connected to. In this case, soldering 19 is used to fix the capacitor 1 to the board, but simply inserting the legs of the capacitor into the holes for inserting the legs of the capacitor and soldering is done with a force parallel to the substrate. Therefore, the capacitor 1 may move easily and cannot be stably fixed.

For example, in the capacitor mounting device for a motor shown in Japanese Utility Model Laid-Open No. 56-169783, a holding piece is attached to the inner edge of a support ring for mounting the capacitor to fix the capacitor in place. Allows the support ring to move inward. Also, the legs of the capacitor are bent and soldered. Thus, in the conventional example, in order to perform stable fixing, after inserting the capacitor into the substrate, the legs are bent to the pattern surface, and the substrate is sandwiched and fixed between the bent portion and the bottom face of the capacitor.

When the magnetic circuit of the motor is, for example, a multi-pole circuit having four magnetic poles, six cores and six segments, the commutator segments 17 and 18 are electrically connected to each other. While they must be connected, the segments other than the opposite must be insulated. Therefore, a structure is adopted in which a resist is applied to the substrate by silk printing or the like to form the insulating layer 8 to form the insulating portion 10, or a part of the segment riser is bent 6 to form the insulating portion. There is. For this reason, an extra process man-hour such as forming the insulating layer 8 on the substrate 3 or bending the part of the riser 6 is required, which deteriorates the accuracy of the commutator and reduces the economical efficiency. It is also becoming.

[0006]

[Problems to be solved by the device]

 Therefore, in this proposal, the circuit pattern is molded, and the capacitor holding part that securely fixes the capacitor during the molding process is formed, and if necessary, part of the circuit pattern is bent in the direction of the insulating material. By providing a commutator device that is embedded and molded in the inside of the molded insulation, it is possible to stabilize the holding of the capacitor and improve the dynamic balance, and to provide a highly economical commutator device that uses the capacitor as an arc extinguishing element. Is what you are trying to do.

[0007]

[Means for Solving the Problems]

 Therefore, in order to achieve the object of the present invention, an iron core and a commutator are attached to the rotary shaft, a spark erasing capacitor is arranged in the slot of the iron core, and this capacitor and the commutator are connected. In this small motor, a board made of an insulating material is arranged on the iron core side of the commutator, a circuit pattern is provided in one direction on this board, and a capacitor holder is formed on the opposite surface. The spark-eliminating capacitor is attached to the part and connected to the circuit pattern, and the riser of the commutator is connected to the circuit pattern to attach the capacitor.

In addition, a circuit pattern of a portion where a riser connected to one segment of the commutator and a circuit pattern connected to the riser connected to the other segment intersect each other is formed by bending toward the substrate side. Is the gist.

[0009]

[Action]

 A circuit pattern is provided in one direction on the substrate provided in the commutator device, and an insulating material is provided on the iron core side. The capacitor holding part is formed on the surface of the insulating material, and after the capacitor for spark elimination is inserted in the capacitor holding part, it is connected to the circuit pattern by soldering and the circuit pattern is connected to the commutator via the riser. Therefore, not only can the capacitor be mounted in a stable condition, but the commutator and capacitor can be connected securely.

Further, since the circuit pattern of a portion where the circuit pattern connected to the riser connected to one segment of the commutator and the riser connected to the other segment of the commutator intersects is formed by bending toward the substrate side, it is simple. Insulation is ensured regardless of the structure.

[0011]

【Example】

 FIG. 1 is a view showing a commutator device of the present invention, which is contrasted with FIG. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The commutator device includes a commutator 2 including segments 17 and 18, a substrate 30, and an upper surface of the circuit pattern 32 extending from the specific segment to a desired segment so as to extend toward the edge of the substrate, and the desired segment to the desired segment. In order to prevent contact between the riser 4 which conducts electricity, the capacitor holding portion 34 formed by projecting the insulating material 31 on the iron core side of the substrate 30 into an annular shape in conformity with the outer peripheral shape of the capacitor 1 and the circuit pattern 32, the riser 4 is prevented. The arc extinguishing device is formed by inserting the capacitor 1 into a predetermined position of the capacitor holding portion 34, which is composed of a pattern bending portion 35 in which a part of the circuit pattern 32 is bent in advance inside the insulating material. ing .

FIG. 2 shows an embodiment for constructing the commutator device of the present invention. The circuit pattern 91 shown in FIG. a is formed in advance with a conductive member such as a copper plate, an iron plate and a phosphor bronze plate. At this time, in order to prevent contact with the riser 4, part of the circuit pattern 91 is bent inside the insulating material, and the pattern bent portion 35 is molded at the same time. If desired, the capacitor foot insertion holes may be pre-drilled. Then, the member is molded with an insulating material 31 and the pattern bending portion 35 is bent or embedded at a desired position on the surface in the iron core direction as shown in FIGS. B and c, and the other conductive member is exposed. The iron core surface forms a substrate 30 covered with a non-conductive member. An annular projecting capacitor holding portion 34, which is in close contact with the outer peripheral portion of the capacitor, is attached to a portion of the iron core direction surface where the capacitor is fixed. After that, the molded product is subjected to a press process to form a desired circuit pattern 32 by performing a process 36 for cutting off the insertion holes of the capacitor legs and a part of the circuit pattern. Next, as shown in FIG. 3D, the capacitor 1 is fitted and fixed in the capacitor holding portion 34, and the legs of the capacitor are soldered to the circuit pattern to electrically connect the capacitor and the circuit pattern 32.

The commutator 2 and the substrate 30 are fixed by pressing the peripheral surface 12 of the commutator into the central opening 11 of the substrate. Further, the riser 4 of the commutator and the conductive connection portion of the circuit pattern 32 are fixed by soldering 20.

In FIG. 2, the capacitor holding portion 34 provided with an annular protrusion that closely contacts the outer peripheral surface of the capacitor is described, but as shown in FIG. 3, the outer peripheral portion of the capacitor is partially attached. It is also applicable as the capacitor holding portion 37 by projecting an engaging portion to be held by the capacitor holding portion 37. These are merely examples, and various modifications can be made within the scope of the present invention other than the embodiments described above.

[0015]

[Effects of the Invention] With the configuration of the present invention, the holding of the capacitor is stable, the dynamic balance is improved, the vibration is reduced, and the reliability is improved.

Since the capacitor is securely fixed to the molded holding portion, there is no need to bend the legs of the capacitor to sandwich the pattern. Therefore, the bending process of the legs of the capacitor is eliminated, so that the economy is improved.

In the case of a multi-pole motor, since the circuit pattern is molded and the insulating portion is provided, not only is it unnecessary to bend the legs of the riser, but it is not necessary to newly provide an insulating layer on the circuit pattern, and commutation is performed. The child and capacitor are mounted in a stable condition.

[Brief description of drawings]

FIG. 1 is a view showing a commutator device of the present invention.

FIG. 2 is an embodiment for constructing a commutator device of the present invention.

FIG. 3 is another embodiment of the capacitor holder of the present invention.

FIG. 4 is a view showing a commutator device of a conventional example.

FIG. 5 is a conventional example showing details of a commutator structure.

[Explanation of symbols]

 11 Opening 12 Peripheral surface 30 Substrate 31 Insulating material 32 Circuit pattern 34 Capacitor holding part 35 Pattern bent part 36 Processing 37 Capacitor holding part 91 Circuit pattern

Claims (2)

[Scope of utility model registration request] 1. A small motor in which an iron core and a commutator are inserted into a rotary shaft, a spark-eliminating capacitor is provided in a slot of the iron core, and the capacitor and the commutator are connected to each other. , A substrate made of an insulating material is disposed on the core side of the commutator,
This board has a circuit pattern provided in one direction, and a capacitor holding portion is formed on the opposite surface.The spark holding capacitor is attached to the capacitor holding portion to connect with the circuit pattern, and the riser of the commutator is connected. A capacitor mounting structure for a small motor that is connected to the above circuit pattern. 2. The circuit pattern at a portion where a riser connected to one segment of the commutator and a circuit pattern connected to the riser connected to the other segment intersect each other, and is bent toward the substrate side. Capacitor mounting structure for small motors.