JPH0352538A - Pulse motor input device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a man-powered device for a valve motor for supplying current to the coils of a stator, and more particularly to a man-powered device for attaching leads from a power source.

[Conventional technology]

In order to energize the stator coil of the Valsmotor, the lead wire from the power source is connected to a terminal, and this terminal is connected to the terminal on the lead wire side of the stator coil.

The terminal on the lead wire side of such a power source is attached to the outside of the motor frame because it is necessary to make a connection with the lead wire.

[Problem to be solved by the invention]

Since the terminal on the power lead wire side is provided outside the motor frame, when a tensile force is applied to the lead wire, that force acts directly on the connection between the terminal and the lead wire. There is an inconvenience that the terminal and the lead wire come off due to this stress load, and the power supply is interrupted.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide a human-powered device for a pulse motor in which the terminal and the lead wire do not come off even if stress such as tension is applied.

[Means to solve the problem]

The human power device for a pulse motor according to the present invention includes a terminal to which a plurality of lead wires from a power source are individually connected and serves as an input terminal for each phase coil of the stator, and an insulator into which each terminal is inserted in a separated state. and a grommet having holes into which the lead wires are individually inserted and guiding each lead wire to the insulator, and the grommet and the insulator are arranged opposite to each other so as to form a bent part in the lead wire going from the grommet to the insulator. It is characterized by being

[Effect]

In the above configuration, the lead wire is guided from the grommet to the insulator and connected to a terminal inserted into the insulator. A bent portion is formed in the portion between the grommet and the insulator in this lead wire, and when stress such as tension is applied to the lead wire, the stress is dispersed at the bent portion of the lead wire. Therefore, the stress transmitted to the terminal is reduced.

〔Example〕

FIG. 1 shows a sectional view of a pulse motor to which an embodiment of the present invention is applied. A stator 2 is attached to the inner surface of a motor frame 1, and a rotor 3 is inserted into the stator 2 in the axial direction.

The motor frame 1 is composed of a cylindrical housing 10 and a cover plate 11 bolted to one end (left end) of the housing 10.
An output end 33 of the rotor shaft 30 projects from the. On the other hand, a stator 2 is fixed within the housing 10. The stator 2 includes a stator core 20 in which a large number of thin silicon steel plates are laminated, and a coil 21 wound around the stator core 20.

As shown in FIG. 3, the stator core 20 has 8 salient poles 2
2, and a slot 23 into which a coil wound around the salient pole 22 is inserted, and a semi-circular groove 24 is formed in the axial direction on the outer surface of the slot 23. As will be described later, a locking pin 25 (see FIG. 4) is inserted into this groove 24, and a pin 251 is inserted thereinto to prevent relative rotation between the stator 2 and the housing 10.

The stator 2 is press-fitted and fixed into the housing 10 with the coil 21 wound around the stator core 20, and this press-fitting is performed by hot press-fitting. That is,
heating the housing 10 to a predetermined temperature to bring it into a thermally expanded state;
The stator 2 that is at room temperature or cooled is inserted into the housing 10 in this state, and when the stator 2 is inserted, that is, when it is hot, a loose fit is possible, and after insertion, it is a tight fit. .

The specific heating temperature of the housing 10 is changed as appropriate depending on the material, dimensions, etc. of the housing. For example, in the case of aluminum or aluminum alloy, the heating temperature is 20
Heating to around 0℃ is sufficient. Since the inner diameter of the housing 10 is somewhat increased during this hot press-fitting, the stator 2 can be press-fitted into the housing 10 smoothly. Therefore, since the stator core 20 does not interfere with the inner surface of the housing 10, press-fit burrs do not occur on the inner surface of the housing 10. Further, since the stator is not deformed at all when the stator is press-fitted, dimensional changes in the stator due to temperature fluctuations can be suppressed, and fluctuations in the gap between the stator and the rotor 3 can be suppressed. When the housing 10 is left to cool after hot pressing, the housing 10 comes into close contact with the stator 2, so that the stator 2 is reliably fixed. Fixing the stator 2 by such a hot presser makes it possible to secure the presser force between the stator 2 and the housing 10 even if the coil 21 becomes hot due to the heat generated during operation of the pulse motor. Accurate operation can be maintained even if there is a rise.

FIG. 4 shows the stator 2 pressed into the housing 10, with the coil 21 omitted and only the stator core 20 shown. Concave groove 2 formed on the outer peripheral surface of the stator core 20
4 and the inner surface of the housing 10 define a communication hole 12. After the stator 2 is press-fitted, a detent pin 25 is driven into the communication hole 12. As shown in FIG. 8, the detent pin 25 is bent to have a U-shaped cross section, and has a wedge shape that increases in height from the leading end 25a to the trailing end 25b. The detent pin 25 is made of a material softer than the material of the housing 20 and is molded into the illustrated shape, and is deformed by driving without deforming the housing 20. The locking pin 25 is driven into the concave groove 24 of one of the stator cores 20 and the communication groove 12 of the housing 10 which are in communication state, and the tip end 25a
These grooves 24.12 have their openings in the housing 20.
Insert it so that it faces to the side and strike the rear end portion 25b. Due to this driving, the detent pin 25 exhibits a wedge effect,
Since stator core 20 and housing 10 are fixed to each other, relative displacement in the circumferential direction thereof is prevented.

As a result, the stator 2 is locked with respect to the housing 10 and does not rotate relative to the housing 10, so that the motor can be operated at a highly accurate operating angle. Note that the rotation stop pin 25 may be driven in at least three positions, and the number is not particularly limited. Also,
The cross-sectional shape may be semicircular.

The housing 10 to which the above-described hot press-fitting is performed is shaped by casting, and in this casting, a mold is used that is divided into right and left sides with line B--B in FIG. 4 as a boundary line. That is, the casting mold consists of left and right molds for molding two halves of the housing 10 in the longitudinal direction, and the housing 10 is cast with these left and right molds butted against each other. After this casting, the mold is separated into left and right parts, and the housing 10, which is a molded product, is taken out.

In the left and right molds divided into two in the longitudinal direction of the molded product in this manner, the wall thickness of the molded product in the longitudinal direction can be made uniform, and the difference in wall thickness can be set to within 0.1 degrees, for example.

On the other hand, if the mold is moved in a direction perpendicular to the longitudinal direction of the molded product,
That is, when the housing 10 is divided in the radial direction, it is necessary to provide a punching bar in the mold, so that the difference in wall thickness in the longitudinal direction becomes 2 to 3 degrees, which is not preferable. Therefore, when the housing 10 is cast using such a mold divided into two parts in the longitudinal direction, the wall thickness of the body part (section C in FIG. 1) into which the stator 2 is press-fitted becomes uniform, and when the stator is press-fitted, the housing 10 is cast. Since the pressure stress is uniform over the entire inner surface of the housing 10, partial deformation of the stator 2 and the housing 10 is eliminated, and reliable motor operation can be achieved.

The housing 10, which is shaped by the above-described casting, has a first
As shown in the figure, the stator 2 is bent inward and extended from the right end of the body (portion C) into which the stator 2 is press-fitted, and a bracket portion 13 is integrally formed in this extended portion. . This bracket part 13 holds the bearing 15 at the inner end of the rotor shaft 30, and also holds the coil 2 of the stator 2.
Head part 4 of terminal base 4 for supplying power to 1
It acts to fix 1. That is, the head portion 41 of the terminal base 4 is fitted and supported between the bracket portion 13 and the outer surface portion of the housing 10 facing the bracket portion 13. In order to provide this support, the bracket portion 13 has a short cylindrical shape. Water escape grooves 14 are formed in the outer surface of this bracket portion 13 in the circumferential direction. The water escape groove 14 is formed on the outer surface of the bracket part 13 so that water that has entered the housing 10 can be quickly discharged at the time of entry. Water may infiltrate through the contact area between the terminal base 4 and the bracket part 13, and the infiltrated water travels along the rotor shaft 30, reaches the rotor 3 and the stator 2, and causes them to rust. The water escape groove 14 directs this water to the housing 10.
The shape of the water escape groove 14 allows water that has entered the housing 10 to be effectively guided below the stator 2. Note that the water guided below the stator 2 is discharged to the outside from a drain hole (not shown) formed in the housing 1o. Therefore,
By forming the water escape groove 14 in the bracket part 13, water infiltration into the housing 10 is prevented, and the rotor 3
Thus, the stator 2 and the stator 2 do not rust, and deterioration of motor characteristics due to rusting can be prevented.

As shown in FIGS. 1 and 5, the rotor 3 has a magnet 31 and a rotor core 32 on the outer surface of the rotor shaft 30.
It is constructed by attaching. Rotor shaft 3
0 is rotatably supported by a bearing 15 such as a ball bearing attached to a cover plate 11 and a bracket part 13 of the housing 10, and its left end penetrates the cover plate 11 and protrudes to the outside of the motor frame 1. It serves as an output end 33. An output gear 34 is attached to the output end 33 of the rotor shaft 30 for transmitting power to external equipment. FIG. 6 shows the attachment structure of the output gear 34 to the output end 33 of the rotor shaft 3o. The output gear 34 is attached to the rotor shaft 30 by a presser.
4 includes a main body portion 34a having gear teeth formed on its outer circumferential surface, and a cylindrical sleeve portion 34b extending in the direction of the rotor shaft 30 from the main body portion 34a. On the other hand, the output end 33 of the rotor shaft 30 has a guide portion 33a formed at its tip portion to be inserted into the main body portion 34a of the output gear 34, and a press-fit portion 33b is continuously connected to the guide portion 33a. has been done.

The press-fitting part 33b of the rotor shaft 30 fixes the output gear 34 to the rotor shaft 30 by being press-fitted into the sleeve part 34b of the output gear 34, and the guide part 33a of the rotor shaft 30 is inserted before this press-fitting. It is inserted into the main body portion 34a of the output gear 34 and guides in the axial direction during press-fitting. In this case, as shown in the enlarged view of the same figure, triangular press-fit teeth 35 are formed in the axial direction on the outer surface of the press-fit portion 33b of the rotor shaft 30 to prevent rotation of the rotor shaft 30. There is. In this structure, in which the output gear 34 is constituted by the main body part 34a and the sleeve part 34b, and the output gear 34 is fixed by enlarging the press-fitting part 33b of the rotor shaft 30 into the sleeve 34b, the stress when the rotor shaft 30 is compressed is reduced. It does not act directly on the main body portion 34a. Therefore, the main body portion 34a having gear teeth is not affected by external deformation due to press-fitting of the rotor shaft, can accurately transmit power, and can ensure highly accurate operation.

Magnet 31 and rotor core 32a in rotor 3,
As shown in FIG. 5, the mounting structure of magnet 32b is such that magnet 31 is located within rotor cores 32a and 32b. The rotor cores 32a, 32b are constructed by laminating a large number of thin steel plates formed into a predetermined shape by punching in the axial direction of the rotor shaft 30.
The magnet 31 and the rotor cores 32a, 32b are fixed by being press-fitted into the magnet 31 and the rotor cores 32a, 32b.

In the figure, 36 is a rotor core 32a. 32b, and are used to maintain the laminated state of the thin steel plates. The magnet 31 is sandwiched between such rotor cores 32a, 32b.
It is located in A circumferential groove 37 is formed in the rotor core portion where the magnet 31 is located. The circumferential groove 37 is formed by providing a gap between the rotor cores 32a and 32b, and extends along the circumference of the magnet 31 in a radial direction from a substantially central portion of the magnet 31, and is located at the outer end of the circumferential groove 37. section is open. An adhesive 38 is injected into the circumferential groove 37 as shown in FIG.

With this adhesive 38, the magnet 31 is attached to the rotor core 32.
The rotor core 32 is fixed relative to the rotor core 32, thereby preventing relative displacement with the rotor core 32. Next, the operation of attaching the magnet 31 and rotor cores 32a, 32b to the rotor shaft 30 will be explained with reference to FIG. First, thin steel plates are laminated and the stud 36
The left and right fa layer plates 32a and 32b are formed by penetrating them (see FIG. 5). These laminated plates 32a, 32b
is assumed to have a U-shaped cross section. And this laminate board 3
The rotor shaft 30 is press-fitted into the magnet 31 so that the magnet 31 enters into 2a or 32b. Thereafter, the other laminate plate 32b or 32a is fixed to the rotor shaft 30 by a presser. The other laminate plate 32b or 32a is fixed to the other laminate plate 32a or 32b by a presser so that the magnet 31 is sandwiched therebetween. As a result, the magnet 31 is sandwiched between the laminated plates 32a and 32b, and a circumferential groove 37 is formed between the laminated plates 32a and 32b.

Then, an adhesive 38 is injected into this circumferential groove 37, and as a result of this injection, the adhesive 38 solidifies so as to close the circumferential groove 37. By solidifying the adhesive 38, the magnet 31 is fixed without being displaced relative to the rotor cores 32a, 32b.

In such a mounting structure, the adhesive 38 is attached to the magnet 3.
Since it is provided in one radial direction and is located at the end face of the magnet 31, it does not interrupt the magnetic path of the rotor cores 32a, 32b (this magnetic path runs in the lamination direction of the laminated plates 32a, 32b). Therefore, the magnetic path resistance is not increased by the adhesive 38, and a highly efficient pulse motor can be obtained.

Next, a power supply system to the coil 21 of the stator 2 will be explained. 9 to 16 are used to connect the lead wire from the coil 21 to the harness wire 8 (see FIG. 20), which conducts the lead wire from the coil 21 and an external power source. The terminal base 4 is shown inserted into the right end side of the housing 10 from the left end side. The Yuichi Minane base 4 consists of a plate part 40 that is fitted onto the right end surface of the stator 2, and a head part 4l that projects from one side of the plate part 40, and the whole is made of a non-conductive material such as plastic. It is shaped like this. The plate portion 40 is shown in FIG.
As shown in FIG. 3, it consists of a lower plate part 40a and an upper plate part 40b, and the stator 2 is fixed to the lower plate part 40a.

On the other hand, the coil 21 of the stator 2 is provided on the upper plate portion 40b.
Coil side terminal 42a to which the lead wire from
~42f are arranged along the circumferential direction. The head portion 41 is integrally formed on one side of the upper plate portion 40b. The head portion 41 is formed into an oval cross-sectional shape, and harness side terminals 43a to 43f connected to the harness wire 8 on the power source side are drawn out. These coil side terminals 42a to 42f and harness side terminals 43a to 43f are connected to each other by wiring portions (shown by chain lines in FIGS. 11 and 13) patterned on one side of the plate portion 40 of the terminal base 4. (for example, 42a and 43a). As shown in FIG. 2, such a terminal base 4 is fixed to the stator 2 by fitting the plate portion 40 to the end of the substantially cylindrical stator 2 so as to make surface contact therewith. FIG. 15 shows a state where the terminal base 4 is housed in the housing 10 of the motor frame 1 together with the stator 1, and the coil side terminals 42a to 42f and the harness side terminals 43a to 43f are connected to the housing 1.
It is located in the upper half of 0. The terminal base 4 as described above holds the coil side terminals 42a to 42f and the harness side terminals 43a to 43f in a connected state, respectively (see Figs. 11 and 13), and the coil side terminals 42a to 42f are held in a connected state. By connecting to the lead wire of the coil 21 and connecting the harness side terminals 43a to 43f to the lead wire of the harness wire 8, the power supply can be supplied to the coil 21, and the terminal base 4 can be attached to the stator 2. This allows the terminal to be attached at the same time. Therefore,
Wiring when assembling the valve motor is simplified, and the handling of the terminal is also improved.

As shown in FIG. 2, the head portion 41 of the terminal base 4 extends in the axial direction of the stator 2 when it is attached to the stator 2, and faces the bracket portion 13 of the housing 10 as described above. It is adapted to be fitted between the outer surface portion of the housing 10 (see FIG. 1). An annular groove 44 is formed at an appropriate position on the outer circumferential surface of the head portion 41 at this fitting portion, as shown in FIGS. 2 and 9 to 11. A seal ring 45 (see FIG. 1), such as an O-ring, is wound around this annular groove 44. The seal ring 45 is connected to the outer surface of the head portion 41 and the bracket portion 13 of the housing 10 and the same portion 13l;
It comes into contact with the inner surface of the outer surface part of and seals the space between them.

Therefore, water does not enter through the sliding contact portion between the head 41 and the housing 10, and rusting of the rotor 3 and stator 2 due to people soaking in water can be prevented. In this case, as will be described later, a cover 5 made of resin potting is applied to the outside of the terminal base 4 to seal the terminal base 4, so that a certain level of water immersion prevention treatment is applied, and strict protection is applied. It has a waterproof and dustproof structure. Note that the seal ring 45 is attached to the head portion 4 of the terminal base 4 in this way.
In order to prevent water from entering through the seal ring 1, an annular groove may be formed in the bracket part 13 of the housing 10 and the outer surface part of the housing 10 facing thereto, and the seal ring may be fitted into this groove. It may be 45 or more.

Each terminal 42a located at Yuichi Terminal Base 4
~42f and 43a ~43f are shown in Fig. 12 and 1
As shown in FIG. 3, it is formed into a clip shape in which rUJ shapes or rUJ shapes are arranged in a row so as to face each other, and each terminal holds a lead wire from the coil 21 of the stator 2 or a lead wire from the harness wire 8, It is connected to each lead wire by performing electrical fusion (hereinafter referred to as electrodeposition). FIG. 16 shows this electrodeposition process. Same figure (
In a), 46 is a terminal, which corresponds to the terminals 42a to 42f and 43a to 43f. A lead wire 47 is inserted into this terminal 46 (FIG. 16(b)), and the terminal 46 is caulked to sandwich the lead wire 47. The lead wire 47 is sandwiched between the terminals 46 with the insulation coating still applied, and then, as shown in FIG. 4C, the terminals 46 are sandwiched between a pair of electrodes 48, and the electrodes 48 are energized. This energization must first be done in advance (7i
It is carried out in two stages: first the i current is passed, and then the main current is passed. The terminal 46 generates heat due to the application of preliminary current, and this heat causes the lead! The insulation coating of I47 melts. Then, the terminal 46 further generates heat due to the main current being applied.
An alloying reaction occurs with the metal composing the sword wire, and as a result, the terminal 46 and the lead wire 47 are electrodeposited. Such electrodeposited connections do not deteriorate or peel off at the electrodeposited sites even under high temperatures, and have good heat resistance. Therefore, even if the terminal 46 is heated to a relatively high temperature due to self-heating during operation of the motor or radiant heat from the outside, the connection state between the terminal 46 and the lead wire 47 is maintained, and a reliable connection is possible.

In addition, electrodeposition is a method that connects by supplying current,
By monitoring the supplied current, it becomes easy to determine whether the connection is good or not. That is, the main current for the alloying reaction is monitored, and if this main current reaches a predetermined value, it can be determined that the connection is good, and in other cases, it can be determined that the connection is poor.

As shown in FIGS. 12 and 13, among the terminals arranged on the terminal base 4, the coil side terminals 42a to 42f connected to the stator coil side are located in the upper half of the plate portion 4o of the base 4 ( That is, it is located along the circumferential direction on the outer periphery of the upper plate portion 40b).

The pulse modes in this example are #1 to #1 as described later.
It has a #4 4-phase coil, and # is connected to terminal 42c.
One end of the 1-phase coil is connected to the terminal 42d, one end of the #3-phase coil is connected to the terminal 42b, one end of the #4-phase coil is connected to the terminal 42e, and one end of the #1-phase coil is connected to the terminal 42a. The other end of the #3 phase coil is connected to the terminal 42f, and the other ends of the #2 phase and #4 phase are connected to the terminal 42f. These terminals 42a to 42f are arranged on the circumference of the terminal base 4 having the same center as the center of the plate portion 4o formed in a substantially disk shape.

The terminals 42a to 42f are connected to the lead wire from the coil 21 of the stator 2 by electrodeposition described above, with the lead wire from the coil 21 of the stator 2 sandwiched between them.
By arranging the electrodes 42f on the same circumferential line, the electrodepositing operation becomes easier and uniform electrodeposition can be achieved. That is, when performing electrodeposition, by rotating the terminal base 4 together with the stator 2, the 16th
Terminals 42a to 42f are connected between the pair of electrodes 48 shown in the figure.
can be positioned sequentially. In electrodeposition using this pair of electrodes, all the terminals 42a to 42f can be electrodeposited under the same conditions by monitoring the electrodes, thereby eliminating variations in the electrodeposition state.

FIG. 17 is a developed view of the windings of the coils for the eight salient poles 22 of the stator core 20, and the salient poles are excited by supplying current to each phase coil of #1 to #4 as shown in the figure. It has become. The coils of the #1 to #4 phases are connected to coil-side terminals 42a to 42f of the terminal base 4, as shown in FIG. Generally, in a four-phase pulse motor, power is not supplied to the #1 phase and #3 phase coils at the same time, and similarly, power is not supplied to the #2 phase and #4 phase coils at the same time. In this embodiment, taking this point into consideration, as shown by points 50 and 51 in FIG.
The power lines V2 and V3 to the three-phase coils are made into a single common line, while the power lines v2 and V4 to the #2 phase l and #4 phase coils are made into another single common line. That is, for a four-phase coil, there are two power supply lines, V and 1,3 (2). By dividing the power supply line into two systems, the current flowing from the power supply line to each phase coil becomes uniform.

In order to organize the power supply lines into two systems, the terminals 42a and 42f on the coil side terminals are formed into a clip shape in which the rUJ-shaped sections are arranged in series so that they face each other, as shown in FIGS. 12 and 13. has been done. FIG. 18 shows a terminal 49 representative of these terminals 42a and 42f, in which a pair of electrodeposited pieces 49a and 49b are arranged opposite each other, for example, the lead wire of the #1 phase coil is electrodeposited on the electrodeposited piece 49a, By electrodepositing the lead wire of the #3 phase coil on the electrodeposited piece 49b, it is possible to make the power lines of the #1 phase and #3 phase coils common through the terminal 49. In the terminal 49 that performs such commonization, there is a dividing groove 4 between the electrodeposited pieces 49a and 49b.
9c is formed. The dividing groove 49c is formed by each electrodeposition 49a, 4
The terminal 49 is formed to span the entire length in the vertical direction, and the electrodeposited pieces 49a and 49b are independent from each other at the tip of the terminal 49. In this way, the electrodeposited piece 4
9a. By providing the groove 49c between the grooves 49b,
The heat capacities of the electrodeposited pieces 49a and 49b can be made equal, and also the heat capacities of the electrodeposited parts of other terminals can be made equal. Therefore, the individual electrodeposited pieces 49a, 49
b is the other terminal 42b to 4 formed into rUJ shape.
It can be subjected to electrodeposition under the same conditions as 2d.

Therefore, the electrodeposition at the terminal 49 (that is, the terminals 42a and 42f) to be made common can also be made uniform, and reliability is improved.

The terminal base 4 described above is formed such that its head portion 41 extends in the axial direction of the stator 2, and the harness side terminal 43a is drawn out from this head portion 41.
~43f is connected to the harness wire 8 by an electric wire. FIGS. 20 and 21 show the connection structure with this harness tl8. The eight wire 8 has six lead wires 8a bundled together, and a socket 9 connected to an output terminal of an external power source is attached to the end thereof. On the other hand, each lead wire 8a is pulled out from the end on the motor side, and the tip end of each lead wire 8a is connected to the corresponding harness side terminal 43a to 43f by electrodeposition. In this case, a frame-shaped frame bracket 16 is formed on one end surface (right end surface in FIG. 1) of the housing 10 of the motor frame 1, and this frame bracket 16
A grommet 7 is fitted into the grommet 7, and after the lead wire 8a of the harness wire 8 passes through the grommet 7, it is connected to each of the harness side terminals 43a to 43f. In Fig. 20, 6 is this terminal 43a~
43f and harness I! ! This is an insulator provided at the electrodeposition site with the lead wire 8a of No.8. This insulator 6 is a member that prevents the terminals 43a to 43f from coming into contact with each other, and is molded from an insulating material such as synthetic resin or rubber. FIG. 19 shows the details of this insulator 6, in which terminal set portions 6a partitioned by thin partition walls are arranged side by side on the upper surface.

Each terminal set part 6a is connected to each terminal 43a to 43.
The electrodeposited pieces f are set so that the electrodeposited pieces of the terminals 43a to 43f do not interfere with each other. Further, a guide groove 6C is formed on the lower surface of the insulator 6 facing each terminal setting portion 6a, and is continuous with each setting portion 6a via a communication window portion 6b. In such an insulator 6, the terminals 43a to 43f connected to the lead wire 8a of the nose 118 are set in a divided state, so that mutual interference between the terminals can be prevented, and short circuits between the terminals can be prevented.

Each lead wire 8a of the 1-ness wire 8 is inserted through the grommet 7, and the tip of each lead 98a extends from the grommet 7 to the guide groove 60 of the insulator 6.
It's like you're being drawn into it. The grommet 7 is configured such that each lead wire 8a is inserted through the grommet 7 separately and independently.For this reason, the grommet 7 has a plurality of holes through which each lead wire 8a is inserted. l
Each lead wire 8a of the nest wire 8 is inserted through such a hole and drawn into each guide groove 6C of the insulator 6, and the hole of the grommet 7 and the guide groove 6C of the insulator 6 are in a one-to-one relationship. It is supported by The grooves of the grommet 7 and the guide grooves of the insulator 6, which correspond to each other, are formed at positions offset from a straight line.

That is, the hole of the grommet 7 corresponding to the guide groove 6C of the insulator 6 is provided on the extension line of the guide groove, and is located at a position slightly shifted from the extension line. With such arrangement of the guide groove 6C of the insulator 6 and the hole of the grommet 7, each lead wire 8a of the harness wire 8 is bent from the grommet 7 toward the insulator 6, as shown in FIG. , the tip portion of the bent portion 8b is inserted into the guide groove 6C of the insulator 6. That is, each Riet line 8
a is partially bent. Even if a load in the tensile direction is applied to the nose va8 due to this bending, the lead wire 8a
Since the load is dispersed at the bent portion 8b of the lead wire 8
The load acting on the electrodeposited portions of a and the terminals 438 to 43f becomes smaller. Therefore, damage to the electrodeposited portion is suppressed, and reliability is increased.

In FIG. 21, after the lead wire 8a of the /X-ness wire 8 and the terminals 43a to 43f are electrodeposited as described above, the terminals 43a to 43f are bent downward in the drawing and are insulated from each other by the insulator 6. /% after
This cover is formed on the frame portion 16 of the housing 10 by resin botting, and by forming this cover 5, the electrodeposited portions of the terminals 43a to 43f are sealed.

〔Effect of the invention〕

As explained above, in the present invention, a bent part is formed in the lead wire between the grommet and the insulator, and stress is distributed at this bent part, so that the stress transmitted to the terminal is reduced, and the stress transmitted to the terminal is reduced. The connection between the lead wire and the lead wire will not come off.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a pulse motor to which an embodiment of the present invention is applied, Fig. 2 is a side view of the part with the motor frame removed, Fig. 3 is a front view showing the stator core, and Fig. 4 is the stator core. 5(a) and 5(b) are front and side views showing the rotor, and FIG. 6 is a sectional view showing the rotor shaft and output gear press-fitted. , Fig. 7 is a sectional view showing how the magnet and rotor core are attached to the rotor shaft, and Fig. 8 (
a). (b). (c) is a side view, front view, and plan view showing the detent pin; FIG. 9 is a plan view showing the terminal base; FIGS. 10 and 11 are side views and cross-sectional views thereof; FIG. 12 is the terminal base. 13 is a rear view thereof, FIG. 14 is a front view showing the state in which the terminal base is attached to the stator, FIG. 15 is a front view showing the state in which the terminal base is inserted into the motor frame,
Figures 6(a), (b), and (c) are perspective views showing the terminal electrodeposition process, Figure 17 is a developed view of the coil windings, Figure 18 is a perspective view showing the terminal, and Figure 19 (a). ), (b) are a front view and a plan view showing the insulator, Fig. 20 is a front view showing the wiring state between the insulator and grommet, and Fig. 21 is the state after applying resin botting from the state shown in Fig. 20. FIG. 1...Motor frame, 2...Stator, 3...
・Rotor, 4...Terminal base, 5...Cover 6...Insulator, 7...Grommet, 10
...Housing, 11...Cover plate, 12.
...Communication hole, 13...Bracket part, 14...Water escape groove, 15...Bearing, 20...Stator core, 21
... Coil 22 ... Salient pole, 23 ... Slot, 2
4... Concave groove, 25... Stopping pin, 30... Rotor shaft, 31... Magnet, 32... Rotor core, 32a... Laminated plate, 32b... Temporary laminated plate, 3
3... Output end, 33a... Guide portion, 33b...
Press-fitting part, 34... Output gear, 34a... Main body part, 3
4b... Sleeve part, 35... Press-fit tooth, 36...
Stud, 37... Circumferential groove, 38... Adhesive, 40.
... Plate part, 41... Head part, 42a to 42f
... Coil side terminal, 43a to 43f ... Harness side terminal, 44 ... Annular groove, 45 ... Seal ring, 46.49 ... Terminal, 47 ... Lead wire, 48 ... electrode. X

Claims (1)

[Scope of Claims] A terminal to which a plurality of lead wires from a power source are individually connected and serves as an input terminal for each phase coil of a stator; an insulator into which each terminal is inserted while being separated from each other; and the lead. a grommet having holes into which the wires are individually inserted and guiding each lead wire to the insulator, and the grommet and the insulator are disposed facing each other so as to form a bent portion in the lead wire extending from the grommet to the insulator. A pulse motor input device characterized by: