JPH0352548A - Fixing structure for stator of pulse motor - Google Patents

Abstract

PURPOSE:To fix a stator core to a housing rigidly by driving a rotation stopping pin, having wedge effect, between the stator core and the housing which receives the stator core. CONSTITUTION:A rotation stopping pin 25 is provided with a U-shape section and wedge effect while the same pin is formed of a soft material and is deformed by driving without accompanying any deformation of a housing 10. In this case, the rotation stopping pin 25 is driven into the recessed groove 24 of a stator core 20 and the communicating hole 12 of the housing. The rotation stopping pin 25 shows wedge effect by driving it and fixes the stator core 20 to the housing 10 mutually whereby the deviation of circumferential relative position between the stator core 20 and the housing 10 may be prevented. According to this method, a stator 2 is locked to the housing 10 and the relative rotation between them will never be caused whereby the motor may be operated with a highly accurate operating angle. Accordingly, a pulse motor, having the operating angle of good accuracy, may be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stator fixing structure for a pulse motor that fixes the stator so that it does not rotate relative to the housing.

[Conventional technology]

2. Description of the Related Art Pulse motors are known in which a stator core around which coils are wound is fixed within a housing of a motor frame with an adhesive.

[Problem to be solved by the invention]

However, with adhesive fixing, it is not possible to securely fix the stator to the housing, and for example, heat generation of the stator may cause loosening between the stator and the housing.
If the stator becomes loose over time, the stator may become misaligned within the housing due to vibrations during driving. This positional deviation causes a deviation in the operating angle of the motor, making it impossible to perform accurate operation.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a stator fixing structure for a pulse motor that securely fixes the stator to a housing and performs accurate operation.

[Means to solve the problem]

The stator fixing device for a pulse motor according to the present invention is characterized in that a detent pin having a wedge action is driven between the outer surface of the stator core and the inner surface of the housing in which the stator core is accommodated.

[Effect]

By compressing the stator core into the housing and driving a pin between the stator core and the housing, the stator core and the housing are firmly fixed by the wedge action of the pin, and relative rotation of the stator is locked.

〔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 recess I on the outer surface of the slot 23.
ft24 is formed in the axial direction. As will be described later, a locking pin 25 (see FIG. 4) is inserted into this groove 24, and the pin 25 prevents relative rotation between the stator 2 and the housing 10.

The stator 2 is fixed by being pressed into the housing 10 with the coil 21 wound around the stator core 20, and this pressing is performed by a hot press. That is,
heating the housing 10 to a predetermined temperature to bring it into a thermally expanded state;
The stator 2, which is at room temperature or cooled, is inserted into the housing 10 in this state. When inserting stator 2,
In other words, it is a fitting method that allows a loose fit when hot, and then becomes a tight fit after insertion.

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°C 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 hot press-fitting makes it possible to secure the press-fitting allowance between the stator 2 and the housing 10 even if the pulse motor becomes hot due to the heat generated by the coil 21 when the pulse motor operates, thereby preventing temperature rise. Accurate operation can be maintained even when

FIG. 4 shows the stator 2 pressed into the housing 10, with the coil 21 omitted and only the stator core 20 shown. Groove 2 formed on the outer peripheral surface of 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 locking pin 25 is made of a material softer than the material of the housing 20 and is shaped into the shape shown in the drawing, and the locking pin 25 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 with each other.
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 stopper pin 25 may be driven in at least one place, and the number thereof is not particularly limited. Further, the cross-sectional shape may be semicircular.

The housing 10 in which the above-described hot press-fitting is performed is formed by casting, and in this casting, a mold is used that is divided into left and right parts 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 thickness can be set to, for example, 0.1 mm or less. On the other hand, if the mold is divided in the direction perpendicular to the longitudinal direction of the molded product, that is, in the radial direction of the housing 10, it is necessary to provide a punching taper in the mold, so the wall thickness difference in the longitudinal direction is This is unfavorable in three respects. Therefore, when the housing 10 is cast using a mold that is divided into two parts in the longitudinal direction, the wall thickness of the body part (portion 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 formed by the above-mentioned casting is the 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 portion 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.
By forming the water escape groove 14, water that has entered into the housing 10 can 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 10. 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.
and are attached to it. 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 a structure for attaching the output gear 34 to the output end 33 of the rotor shaft 30. The output gear 34 is attached to the rotor shaft 30 by press fitting.
4 includes a main body portion 34a having gear teeth formed on its outer peripheral surface, and a cylindrical sleeve portion 34b extending from the main body portion 34a in the direction of the rotor shaft 30. 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 presser portion 33b of the rotor shaft 30 fixes the output gear 34 to the rotor shaft 30 by being press-fitted into the sleeve portion 34b of the output gear 34, and the guide portion 33a of the rotor shaft 30 is inserted into the sleeve portion 34b of the output gear 34 prior to this press-fitting. The output gear 34 is inserted into the main body 34a of the output gear 34 to guide it in the axial direction during press-fitting. In this case, as shown in the enlarged view of the same figure, triangular pressure teeth 35 are formed in the axial direction on the outer surface of the press-fitting portion 33b of the rotor shaft 30 to prevent rotation of the rotor shaft 30. ing. 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 pressing the press-fitting part 33b of the rotor shaft 30 into the sleeve 34b, the stress caused when the rotor shaft 30 is press-fitted is 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 horizontal mounting structure of the magnet 32b is such that the magnet 31 is located within the rotor cores 32a and 32b. The rotor cores 32a, 32b are constructed by laminating a large number of thin steel plates punched into a predetermined shape in the axial direction of the rotor shaft 30.
0 is pressed against the magnet 31 and the loader cores 32a, 32b, thereby fixing the magnet 31 and the rotor cores 32a, 32b.

In the figure, numeral 36 denotes studs that pass through the rotor cores 32a and 32b, respectively, and are used to maintain the laminated state of the thin steel plates. The magnet 31 is sandwiched between the rotor cores 32a, 32b, and the magnet 31 is sandwiched between the rotor cores 32a, 32b. 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, the thin steel plates are laminated and the stud 36
(See Figure 5)
2a and 32b are formed. This laminated plate 32a. 32b is oval-shaped so as to have a U-shaped cross section, and either one of the laminated plates 32a or 32b is fixed to the rotor shaft 30 by means of a picture. And this laminate plate 32a or 32b
the rotor shaft 3 so that the magnet 31 enters inside.
0 into the magnet 31. Thereafter, the other laminate plate 32b or 32a is fixed to the rotor shaft 30 by press fitting. This other laminate plate 32b or 32a is press-fitted and fixed to one laminate plate 32a or 32b so that the magnet 31 is sandwiched therebetween. As a result, the magnet 31 is sandwiched between the laminate plates 32a and 32b, and the laminate plate 32
A circumferential groove 37 is formed between a and 32b.

Then, an adhesive 38 is injected into the 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 on 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, magnetic path resistance is not added 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, in order to connect the harness wire 8 (see FIG. 20) that conducts the lead wire from the coil 21 and the external power source, the right end of the housing 10 is shown from the left end side as shown in FIG. 1. Terminal base 4 inserted into the side
shows. The Yuichi Minane base 4 consists of a plate portion 40 that is fitted onto the right end surface of the stator 2, and a head portion 41 that is formed to protrude from one side of the plate portion 40.
The entire device is integrally molded from a non-conductive material such as plastic. The plate portion 40 is shown in FIGS. 12 and 13.
As shown in the figure, it consists of a lower plate part 40a and an upper plate part 40b, and the stator 2 is fixedly attached 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 438 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 pulse 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 designed to be fitted between the outer surface 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 contacts the outer surface of the head portion 41, the bracket portion 13 of the housing 10, and the inner surface of the outer surface portion of the housing 10 facing the bracket portion 13, thereby sealing 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 bottling 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.
It has a strict waterproof and dustproof structure. Note that the seal ring 45 is attached to the head portion 41 of the terminal base 4 in this way.
In order to prevent water from entering through the housing 10, an annular groove may be formed in the bracket portion 13 of the housing 10 and the outer surface portion of the housing 10 opposite thereto, and a plurality of seal rings 45 may be fitted into this groove. It's good as well.

Each terminal 42a located in the evening 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 "U" shapes or rUJ shapes are connected in series so that each terminal connects the lead wire from the coil 21 of the stator 2 or the lead wire from the harness wire 8. It is connected to each lead wire by pinching and applying 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. Insert the lead wire 47 into this terminal 46 (16th
(b)), 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 C), the terminal 46 is sandwiched between a pair of electrodes 48, and the electrodes 48 are energized. This energization is performed in two stages: first, a preliminary current is applied, and then a main current is applied. The terminal 46 generates heat due to the application of the preliminary current, and the insulation coating of the lead wire 47 melts due to this heat generation. When the main current is applied, the terminal 46 further generates heat, causing an alloying reaction with the metal forming the sword wire, and as a result, the terminal 46 and the lead wire 47 are electrodeposited. Connections made by overcast electrodeposition do not deteriorate or peel off at the electrodeposited parts even under high temperatures, and have good heat resistance. Therefore, even if the motor is heated to a relatively high temperature due to self-heating during operation or radiant heat from the outside, the terminal 46 and lead! The connection state with I47 is maintained and a reliable connection is possible.

In addition, electric monitors are connected 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 the upper half of the plate portion 4o of the base 4 (i.e. , are 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. and the other end of the #3 phase coil is terminal 42f1. : #2 + [1 o and #
The other ends of the 4 phases are connected. These terminals 42a~
42f is disposed on the circumference of the terminal base 4 having the same center as 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 as described above, but in this way, all the terminals 42a
42f are arranged on the same circumferential line, the electrodeposition work becomes easy 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 monitored 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 phase coils #1 to #4 are connected to coil side terminals 42a to 42f of the terminal base 4, as shown in FIG. 12. 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 example, considering which points, the #l phase and the #
The power lines V1 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 and #4-phase coils are made into another single common line. That is, for a 4-phase coil, the power line is V and 1
．． 3. There are two systems. 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 this terminal 42a. 42f is shown, and a pair of electrodeposited pieces 49a. For example, the lead wire of the #1 phase coil is electrodeposited on the electrodeposited piece 49a, and the lead wire of the #3 phase coil is electrodeposited on the electrodeposited piece 49b. It is possible to use a common power line for the 1st phase and #3 phase coils. In the four terminals that are made common in this way, 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
It is formed to extend over the entire length of the terminal 9b in the vertical direction, and the electrodeposited pieces 49a and 49b are independent from each other at the tip portions of the four terminals. In this way, the electrodeposited piece 4
By providing the groove 49c between 9a and 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 another terminal 42b to 4 formed into a “U” 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, 42f) to be made common can 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 electrodeposition. 20 and 21 show the connection structure with this harness wire 8. FIG. The harness wire 8 has six lead wires 8a bundled together, and a socket 9 connected to an output terminal of an external electric 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, one end surface of the housing 10 of the motor frame 1 (the first
The right end surface in the figure) has a four-frame frame bracket 1.
6 is formed, and a grommet 7 is fitted to this frame bracket 16, and after the lead wire 8a of the harness wire 8 passes through this grommet 7, it is connected to each harness side terminal 43a to 43f. ing. In Fig. 20, 6 indicates this terminal 43a-4.
3f and the lead wire 8a of the harness wire 8 are electrodeposited. 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 details of this insulator 6, in which terminal set portions 6a partitioned by thin partition walls are formed side by side on the upper surface. The electrodeposited pieces of the terminals 43a to 43f are set in each terminal setting portion 6a, thereby preventing the electrodeposited pieces of the terminals 43a to 43f from interfering with each other. Furthermore, 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. Such an insulator 6 is connected to the lead wire 8 of the harness wire 8.
Since the terminals 43a to 43f connected to terminal a are set in a divided state, mutual interference among the terminals can be prevented, and short circuits between the terminals can be prevented.

Each lead wire 8a of the harness wire 8 is inserted through the grommet 7, and the tip end of each lead wire 8a is drawn through the grommet 7 into the guide groove 6C of the insulator 6. The grommet 7 is configured such that each lead wire 8a is inserted through the grommet 7 independently in a separated state, and for this reason, the grommet 7 is formed with a plurality of holes through which each lead wire 8a is inserted. Each lead wire 8a of the harness wire 8 is inserted through such a hole and bowed into each guide groove 6C of the insulator 6, and the hole of the grommet 7 and the guide m6c of the insulator 6 form a pair. 1 is supported. The grooves of the grommet 7 and the guide grooves of the insulator 6, which correspond to each other, are arranged at positions deviated from a straight line.

That is, the hole of the grommet 7 corresponding to the guide groove 60 of the insulator 6 is not located on the extended line of the guide, but is provided at a position slightly shifted from this extended line. With this 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 60 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 harness wire 8 due to this bending, the load is dispersed at the bent portion 8b of the lead wire 8a, so that the load is applied to the electrodeposited portion between the lead wire 8a and the terminals 43a to 43f. becomes smaller. Therefore, damage to the electrodeposited portion is suppressed, and reliability is increased.

In FIG. 21, reference numeral 5 indicates that after the lead wire 8a of the harness 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 mutually insulated by the insulator 6. , is a cover formed by resin potting on the frame portion 16 of the housing 10, 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, since the pins having a wedge effect are driven between the stator core and the housing,
Relative rotation between the stator core and the housing is locked. Therefore, a pulse motor with good operating angle accuracy can be provided.

[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; FIG. 6 is a sectional view showing the rotor shaft and output gear press-fitted; FIG. The figure is a sectional view showing how the magnet and rotor core are attached to the rotor shaft.
), (b), and (c) are side views, front views, and plan views showing the locking pin; FIG. 9 is a plan view showing the terminal base; FIGS. 10 and 11 are side views and cross-sectional views thereof; Figure 12 is a front view of the terminal base, Figure 13 is its rear view, Figure 14 is a front view showing the terminal base attached to the stator, and Figure 15 is a front view showing the terminal base inserted into the motor frame. Figure, 16th
Figures (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 of the terminal, and Figure 19 (a). , (b) is a front view and a plan view showing the insulator, Fig. 20 is a front view showing the wiring state between the insulator and the grommet, and Fig. 21 is the state shown in Fig. 20 after applying resin potting. FIG. 1...Motor frame, 2...Stator, 3...
・Mouth, 4... Terminal base, 5...Cover 6...Insulator base, 7...Grommet, 10
...Housing, 11...Cover plate, 12.
...Communication hole, 13...Bracket part, 14...Water escape, 15...Bearing, 20...Stator core, 21
... Coil 22 ... Salient pole, 23 ... Slot, 2
4... Concave full, 25... Stopping pin, 30... Rotor shaft, 31... Magnet, 32... Rotor core, 32a... Laminate plate, 32b... Laminate plate, 3
3... Output end, 33a... Guide part, 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.

Claims (1)

[Claims] A stator fixing structure for a pulse motor, characterized in that a wedge having a substantially U-shaped cross section is driven between the outer surface of the stator core and the inner surface of the housing in which the stator core is housed, with the opening thereof facing the housing. .