JPS5822569A - Motor - Google Patents

Abstract

PURPOSE:To enlarge the range of rated voltage of a motor by a method wherein capacitors are mounted on a wiring substrate, and the conductor parts of the wiring substrate are short-circuited or cut to connect the capacitors in ring connection and in star connection. CONSTITUTION:A copper foil conductor pattern is formed on the printed wiring substrate, and the copper foil pattern thereof is formed of the ring-type conductor part 26 connected to outside terminals 25a1-25c1 of the capacitors 25a- 25c, and of the branched conductor parts 27a-27c extended from the ring-type conductor part 26 thereof and connected to inside terminals 25a2-25c2 of the capacitors 25a-25c. The conductor parts thereof are short-circuited or cut to connect the capacitors 25a-25c in ring connection and in star connection, and the range of rated voltage of the motor is enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor applied to hair dryers and the like.

The rotor of a conventional motor is shown in FIGS. 1-3. That is, the coil 2 is wound around each pole of the Ronita iron core 1, and the shaft 3 is attached to the center, while the same triangular insulating sheet 5 is placed on the triangular capacitor mounting plate 4, and the mounting plate 4
One lead 7a of the spark absorption capacitor 7 is soldered to the hole 6 at the top corner of the mounting plate 4 through an insulating sheet.
The main body of the capacitor 7 is placed in the space between the poles of the rotor by passing the center hole 8 through the shaft 3 from the lower end. Further, a commutator 9 is passed through the upper end of the shaft 3 and positioned on the upper end surface of the rotor core 1, and the other lead 7b of the capacitor 7 is connected to the riser terminal plate 10 of the commutator 9.

In this case, the coil 2 is Δ-connected to the commutator 9, and the capacitor 7 is Y-connected to the commutator 9 (either a polar capacitor or a non-polar capacitor can be used).

By the way, in order to change the specifications of this motor so that the rated voltage of the motor exceeds the rated voltage of capacitor 7, it was naturally necessary to change the rated voltage of the capacitor to one that exceeds the rated voltage of the motor. . However, this had the following drawbacks: (a) The rated voltage of the capacitor? If the capacitor is made larger, the size of the capacitor becomes larger, and it may not be possible to insert and fix the capacitor into the inner space of the rotor of a small motor. Even if you choose a capacitor with a higher rated voltage, the capacitor shape may change (for example, the combination of outer diameter and length for a cylindrical capacitor) may become larger, and the motor's rating may change. In some cases, it was virtually impossible to cope with increasing the voltage.

(b) If the capacitors are changed according to the difference in motor rated voltage, even if there are capacitors of the same size, the color display of the capacitors must be changed or some kind of easy-to-see distinction must be made, which requires preparation from a mass production perspective. The number of types of parts to be assembled increases, which increases the effort required to manage them, and troubles such as incorrectly assembling the capacitor specifications are likely to occur.Also, the capacitor block shown in Figure 1 is assembled in a process separate from the motor assembly process. The above-mentioned troubles are very likely to occur because they are often assembled by outsourced processing.

Therefore, an object of the present invention is to provide a motor that can easily obtain a motor rated voltage that exceeds the rated voltage of the capacitor without changing the capacitor.

A first embodiment of this invention is shown in FIGS. 4 to 14. In other words, this motor has a stator 11° and a rotor 12
．． It consists of a brush block 13.

As shown in FIGS. 8 and 9, the stator 11 has a pair of arc-shaped cylindrical magnets 4 fixed to the inside of a bottomed cylindrical yoke, and a bearing stand 15 is fixed to the bottom center hole, and a bearing 16 is fixed thereto.
is provided. As shown in FIGS. 6 and 7 of the rotor 12, a coil 18 is wound around the ball of the rotor core 17, a shaft 19 is inserted through the center, and a thrust collar 20 is inserted from the lower end of the shaft 19. A printed circuit board 21 for a noise prevention circuit and a commutator 22 are inserted onto the rotor core 17 from the upper end of the shaft 19 . The printed circuit board 21 is the 11th
As shown in the figure, it is disk-shaped, and radial concave portions 24 are formed from the center hole 23, and non-polar capacitors 25 are formed in the four portions 24.
capacitors 25a to 25c are mounted, and the copper foil conductor pattern of the printed circuit board 21 is connected to the capacitors 25a to 25c as shown in FIG.
The ring conductor portion 26 is connected to the outer terminals 25a to 25c of 5c, and the capacitor 25a is connected to the ring conductor portion 26.
It consists of branch conductor parts 27a to 27c extending and connected to inner terminals 25a to 25c of 25c, and a cutting process is added as follows at the stage of assembling the rotor when the motor specifications have been determined. That is, capacitors 25a to 25c
In the case of Y connection, the branch conductor parts 27a to 27a are connected by a laser beam, etc.
The center part A of 27c is cut and separated as shown by the broken line, and in the case of Δ connection, the ring conductor part 260 part B is cut and separated as shown by the broken line. The commutator 22 has an outer circumferential surface divided into three parts by a slit 28 to form segments 29a to 29cf, and a riser terminal 30, which is electrically connected to each segment 29a to 29c, protrudes radially from the lower end, and the commutator 22' f: Insert each riser terminal 30 into the hole of the printed circuit board 21 to connect the inner terminals 25a to 25c of the capacitors 25a to 25c.
2 (FIG. 12) In both tables, the coil 18 is connected in a delta connection. As a result, the capacitors 25a to 25c are Y-connected to the commutator 22 by cutting into parts.
By cutting, a Δ connection is made, and the connection shown by the solid line spanning the broken m as shown in FIG. 13 is performed.

As shown in FIGS. 4 and 5 (5), the brush block 13 has a bearing 32 provided on the lower surface of the center of the bracket 31, a terminal 33.34 provided through the periphery, and a lower side of the terminal 33.34. brushes 35 and 36 are provided.

The motor is assembled by fitting the rotor 12 into the stator 11, passing the shaft 19'f through the bearing 16, and protruding from the lower end.
When the bracket 3 of the brush block 13 is closed to the upper end opening of the stator 1, the brushes 34 and 35 come into elastic contact with the commutator segments as shown in FIG.

With this configuration, this motor has the following effects. Namely.

(1) A common specification can be applied to different motors whose rated voltage exceeds the rated voltage of one capacitor without replacing the capacitor. Assuming that the size of the motor (motor outer diameter, length, etc.) is constant, the upper limit of the output that the motor can handle is almost constant and does not vary greatly depending on the rated voltage of the motor. (A slight increase in efficiency may be observed in the case of low-pressure motors.) The rated voltage of the rotor capacitor is usually set to a threshold value (6) higher than the rated voltage of the motor, and the capacitor's capacity is set to EL, which stores the electromagnetic energy stored in the coil, and the capacitor stores -4CV.
(L: Inter-segment inductance of rotor coil, ■
: motor rated current, C: capacitor capacity, ■=capacitor voltage. ), and is usually designed so that EL≦Eo. Therefore, if the motor's rated voltage is high but the output is not so necessary, or the torque is small, the current will be significantly reduced and the capacitor with high withstand voltage and low capacity will be sufficient. The advantages of the example connection selection method appear.

In that case, the voltage applied to the rotor capacitors 25a to 25c when the capacitors 25a to 25c are Δ-connected or Y-connected is the same as the voltage applied to the rotor capacitors 25a to 25c in the case of the three-pole motor of the embodiment. 25c, approximately T of the motor applied voltage is applied to the capacitors 25a to 25c when Y-connected, and the apparent motor rated voltage is Δ
This is twice as much as in the case of wire connection.

(2) When automatically assembling the motor by mechanization instead of manually assembling the motor, the reduction in the number of types of parts is particularly advantageous in terms of mass production, as it reduces the effort required to change production models.

(3) Cutting the circuit using a laser, which was mentioned earlier as a specific method, would increase unnecessary processing if done manually, which would only lead to increased costs, but if automatic processing is assumed, these processing It is easy to mechanize, it is easy to process within the original process tact, and there is no adverse effect on processing efficiency or cost.

A second embodiment of the invention is shown in FIG. That is,
This motor has a ring conductor section 26 on a printed circuit board 21'.
Separated portions 37a to 37c, 38a to 38c are formed in advance on the branch and groove body portions 27a' to 27c', and the separated portions 37a to 37c + 38 are separated according to the wiring configuration.
A to 38c are coated with a conductive paint that can be automated or printed in the form of a stamp to create a short circuit.

As described above, in the motor of the present invention, the capacitors are mounted on the wiring board and the conductor portions of the wiring board are short-circuited or cut so that the capacitors can be connected in a ring shape or in a star shape, so that there is no need to change the capacitors. This has the effect of expanding the rated voltage range of the motor.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a conventional capacitor block, Figure 2 is an exploded perspective view of the rotor, Figure 3 is a perspective view of the rotor,
4 is an exploded perspective view of the brush block of the first embodiment of the present invention, FIG. 5 is a perspective view of the brush block, FIG. 6 is an exploded perspective view of the rotor, and FIG. 7 is a perspective view of the rotor. Figure 8 is an exploded perspective view of the stator, Figure 9 is a perspective view of the stator,
Figure 0 is a perspective view of the motor, Figure 11 is an exploded perspective view of the commutator block, Figure 12 is a perspective view of the commutator block, and Figure 13 is an exploded perspective view of the commutator block.
14 is an enlarged plan view of the printed circuit board, and FIG. 15 is an enlarged plan view of the printed circuit board of the second embodiment. 17... Rotor core, ]8... Coil, 2], 21
'・Printed circuit board, 22... Commutator, 25a to 25c
... Capacitor, 26, 26'... Ring conductor part, 27a to 27c... (9) Branch groove body part, A, B, cutting part, 37a to 37c,
38a-38c... Separation part (10) - (ji=) Procedural amendment (voluntary) 1. Indication of the case 1982 Patent Application No. 121533 2, Name of the invention Motor 3, Person making the amendment Relationship to the case Applicant Address 1048 Kadoma in bold, Kadoma City, Osaka Prefecture Name (
583) Matsushita Electric Works Co., Ltd. Representative Yoshi Kamimae -4, generation
(2) In the drawings, Figures 4, 5, and 10, the reference numeral "
24'' as shown in the attached red inscription in Figure 4 □16 Figure 8 Figure 5 Figure 7 Figure 7G Jun 33 Kurami Bin 213 375-

Claims (1)

[Claims] A commutator, a plurality of a-ta coils connected in a ring to the commutator, a number of spark absorbing capacitors corresponding to the number of coils, and these capacitors are mounted to cut off a predetermined position f' of its own conductor. Furthermore, a motor is provided with a wiring board having a ring conductor part and a plate groove part for connecting a capacitor to the commutator in a ring shape or a star shape by short-circuiting.