JP2608739B2 - Commutator motor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a commutator motor used for a power tool or the like, and more particularly, to set a rotation direction of the motor very simply when assembling the commutator motor. The present invention relates to a commutator motor that can be used.

(Prior Art) Conventionally, when setting the rotation direction of a commutator motor, the rotation direction is determined according to, for example, the type of a power tool or the like, and thereafter, an electric motor for rotating the commutator motor in the determined rotation direction is used. Means of performing a typical wiring have been adopted.

(Problems to be Solved by the Invention) In the case of the conventional commutator motor, the rotation direction of the motor is determined according to the type of a power tool or the like using the motor, and the rotation direction is determined according to the determined rotation direction. However, since the means of individually performing the wiring connection work is adopted, there is a problem that a mistake in the wiring connection occurs and the number of work steps increases.

Therefore, in the present invention, a current path corresponding to each rotation direction of the commutator motor is formed in advance on the terminal base, a current path corresponding to the target rotation direction is left, and the other current path is cut off. It is an object of the present invention to solve the problem that the rotation direction of the commutator motor can be set very easily and reliably.

(Means for Solving the Problems) The technical means for solving the above-mentioned problem is that one end face of a stator in which a required stator winding is wound around each magnetic pole is provided on one end face of the stator winding. While each terminal wire is connected and a terminal plate provided with an insertion type terminal for inserting and connecting an external insertion terminal is adhered and fixed, the terminal plate is provided with the insertion terminal, and a commutator is provided. A terminal base provided with a brush assembly for contacting and supplying a required current to the rotor winding and a fixed terminal for connecting a lead wire from a power switch or the like is directly connected to the terminal plate. In a commutator motor in which a required electric connection is made by coupling, the terminal base has a forward conductive path for a current flowing through the rotor winding via the commutator and a reverse conductive path. Each conductive path of the forward conductive path is formed in advance, and a cut portion for cutting off the path of the forward conductive path or the reverse conductive path corresponding to the rotation direction of the rotor is formed by the forward conductive path and That is, a configuration is provided in each of the reverse conductive paths.

(Operation) According to the commutator motor having the above-described configuration, the terminal base has a positive-direction conductive path for passing a current flowing through the rotor winding through the commutator in the positive direction, A reverse conductive path for supplying a current in the reverse direction is formed in advance, and it is necessary to select a positive conductive path in order to rotate the commutator motor in the positive direction, for example. Cut the cut formed in the road.

On the other hand, since it is necessary to select a reverse conductive path in order to rotate the positive flow motor in the reverse direction, the cut portion formed in the positive conductive path is cut. By performing the cutting process as described above, the forward conductive path or the reverse conductive path is selected, and when driving power is supplied from the outside, the selected forward winding path is applied to the rotor winding of the commutator motor. Since the drive current flows through the conductive path or the reverse conductive path, the rotor of the commutator motor rotates in the forward or reverse direction.

(Example) Next, an example of the present invention will be described with reference to the drawings. It should be noted that in the description of the embodiment, upper, lower, left,
A description indicating a direction such as the right indicates a direction on the drawing.

FIG. 1 is a front view of an electric drill 1 in which a state where a commutator motor 2 is incorporated is partially cut away. As shown in FIG. 1, the commutator motor 2 is mounted with a stator core 5 fitted in a rib 4 formed on an inner surface of a housing 3 forming a body of the electric drill 1. A rotor shaft 6 attached to the rotor of the commutator motor 2 is supported at its rear end by a bearing 7, is engaged at its front end by the rotating part 1 A of the electric drill 1, and has a commutator 8. Is installed.

Next, a first embodiment of a type in which a later-described brake coil and a main coil are wound around a stator core 5 will be described with reference to FIGS.

As shown in FIG. 2, a terminal plate 9 made of a resin material is provided on the upper end surface of the stator core 5 with a stator winding 10L divided and wound in two as shown in FIG. , 10R
Each of the insulating frames and the windings are prevented from collapsing. A terminal plate 11 having a similar shape is also attached to the lower end face of the stator core 5, but the terminal plate 11 is not electrically connected to the stator windings 10L and 10R. Only the insulation frame and the winding shape collapse prevention function are provided.

On the other hand, the brushes 13A and 13B which come into contact with the commutator 8 so as to be able to conduct electricity and conduct electricity to the rotor winding wound around the rotor
The terminal base 14 to which the above is attached is mounted on the terminal plate 9.

As shown in FIG. 2, the brushes 13A and 13B are
Brush holders 17A, 17B electrically connected to brush lead wires 13AL, 13BL connected to A, 13B are attached,
Further, in order to press the respective end surfaces of the brushes 13A and 13B against the commutator 8, coil-shaped brush springs 18A and 18B formed of a thin plate-like spring material are attached to brush spring holders 19A and 19B. The tip ends 18AF, 18BF of the brush springs 18A, 18B correspond to the brushes 13A,
The brush 13A comes into contact with the rear end surface of each of the brushes 13B and applies a pressing force from behind the brushes 13A and 13B. FIG. 3 is a partially detailed view of the above state.

On the other hand, the brush springs 18A and 18B separate the brushes 13A and 13B from the commutator 8 in a state where the tips 18AF and 18BF are in contact with the side surfaces of the brushes 13A and 13B as shown in FIG. It also has the function of holding in position.
That is, as shown in the partial detailed view of FIG. 4, the tip 18AF (18BF) of the brush spring 18A (18B) is
The brush 13A is in contact with the side surface of the brush 13A (13B) at the side cutout 19 of the brush 17A (17B), and the brush 13A is pressed by the pressing force of the brush spring 18A (18B) against the side surface of the brush 13A (13B).
(13B) is pressed against the inner surface of the brush holder 17A (17B) and is held at that position. In this state, when the brush 13A (13B) is artificially pushed out from the rear, the tip portions 18AF (18BF) of the brush springs 18A, 18B change from the contact with the side surface of the brush 13A (13B) to the contact state with the rear end surface. The brush 13A (13B) comes into contact with the commutator 8 as shown in FIG. That is, the brush spring 18A (18B) has a function of bringing the brush 13A (13B) into press contact with the commutator 8 while the brush 13A (1B)
3B) is held in a position where it does not contact the commutator 8, and for example, after assembling the terminal base 14 to the terminal plate 9, the rotor is inserted into the stator, and the brush 13A (13B)
To the commutator 8. Therefore, the brush 13A (13B) can be brought into a sufficient contact state with the commutator 8 only by artificially pressing the brush 13A (13B) from the rear end face direction, so that the assembling efficiency can be increased.

FIG. 5 is an external perspective view of the terminal base 14 detached from the terminal plate 9, FIG. 6 is a plan view of the terminal base 14, FIG.
FIG. 8 is a right side view of the terminal base 14.

As shown in FIGS. 5 to 8, on the upper surface of the terminal base 14, the brush holders 17A and 17B for inserting the brushes 13A and 13B respectively, the brush springs 18A and 18B, Brush springs 19A, 19B supporting the brush springs 18A, 18B are provided, and terminals 20, 21, 22, 23 of a lead wire terminal portion connected to a switch of the electric drill 1 are mounted. Fixed terminals 24, 25, 26, and 27 are provided. The fixed terminals 24,
25, 26, 27 are erected on the main body portion 14A formed of synthetic resin, each fixed terminal is formed at the terminal portion of the conductive plate described later, the middle part of the conductive plate, It is embedded in the main body 14A of the synthetic resin.

On the other hand, on the lower surface of the terminal base 14, there are provided small and flat terminals 28, 29, 30, 31, 32, 33, 34, and 35, respectively. ~ 35 is
The plurality of insertion terminals 36, 37, 38, 39, 40, 41, 42, 43 described later provided on the terminal plate 9 are respectively inserted and electrically contacted. The terminals 28 to 35 are formed at terminal portions of a conductive plate described later, and an intermediate portion of the conductive plate is embedded in a synthetic resin portion of the main body 14A. Also, four lock pieces 44, 45, 46, 47 extend from the lower surface of the terminal base 14, and lock claws 48, 49, 50, 51 are formed at the respective ends of the lock pieces 44 to 47. Have been. As shown in FIG. 2, the lock claws 48 to 51 are hooked on the hooks of the terminal plate 9. 14 and the terminal plate 9 are latched in a retaining shape. When the terminal base 14 is to be detached from the terminal plate 9, the lock claws 48 to 51 are hooked by pulling the trip hooks 44a to 47a formed on the outer lower end surfaces of the lock pieces 44 to 47 outward. It can be easily pulled off from the stop.

As shown in FIG. 6, the brush holders 17A and 17B and the brush spring 1
8A, 18B, brush spring holders 19A, 19B, fixed terminals 24,
25, 26, 27, etc., a commutator 8 and a brush 13
Terminal holes 61, 62 and 6 for connecting choke coils 60L and 60R for attenuating noise generated at the contact points with A and 13B
3,64 are provided. In addition, since between the terminal holes 61 and 62 and between the terminal holes 63 and 64 are normally short-circuited by a conductive plate described later, the choke coils 60L and 60R are connected to the terminal holes 61 and 62 and the terminal When connecting between the holes 63 and 64, the conductive plate is cut by the cutting windows 65 and 66 to cut the choke coil 60.
L, 60R are soldered or spot-welded at the terminal holes 61, 62 and 63, 64 so that a drive current for the rotor winding flows through the choke coils 60L, 60R. When the brushes 13A and 13B are inserted into the two brush holders 17A and 17B, respectively,
A brush lead 13AL (13BL) connected to A (13B)
(See Fig. 2) Brush holder terminals 17AT and 17B for connection
T is provided.

Further, as shown in FIG. 7, a plurality of small lead wire guide pieces 67 are formed in a hanging manner from the upper end surface of the terminal base 14, and the lead wires connected to the fixed terminals 24 to 27 are formed. It has a role of guiding the terminal base 14 so as not to protrude from the outer peripheral portion. Further, a plurality of lead wire guide holes 68 through which the lead wires guided by the lead wire guide pieces 67 are inserted are formed in the outer peripheral portion of the terminal base 14. FIG. 9 illustrates the guide state of the above-mentioned lead wire by taking the lead wire 23L as an example.
8 is a lead wiring state diagram showing that the wiring is performed in a stable state, guided by No. 8. FIG.

As shown in FIG. 6, a commutator insertion hole 69 for inserting the commutator 8 through a required gap is formed in the terminal base 14 in a circular shape. The blocking plates 70L and 70R for blocking the carbon powder generated when the brushes 13A and 13B come into contact with the brush and preventing the lead wire from contacting the commutator 8 are provided with the commutator insertion holes 69. Are formed in a face-to-face manner along the edge of the. The facing surfaces of the blocking plates 70L, 70R are each formed into a curved surface having a curvature corresponding to the diameter of the commutator 8.

10 is an external perspective view of the terminal plate 9, FIG. 11 is a plan view of the terminal plate 9, FIG. 12 is a front view of the terminal plate 9, and FIG. 13 is a right side view of the terminal plate 9. is there.

The terminal plate 9 is attached to the end face of the stator core 5 as described above, and a plurality of terminals 36 to 43 to which the respective terminal wires of the stator windings 10L and 10R are connected are integrated with the main body, respectively. It is fixed to the molded terminal fitting cavity. 2, the terminal plate 9 is formed in the axial direction on the surface of the stator core 5 when the terminal plate 9 is attached to the stator core 5 as shown in FIG. Four fixed claws 53A, 53B, 53C, and 53D fitted into each of the plurality of narrow grooves 52 are integrally formed. On the other hand, on the upper surface of the terminal plate 9, two sets of winding support frames 54L, 54R for holding the stator windings 10L, 10R so as not to lose shape are formed facing each other. And each winding support frame
Opposing surfaces 55L, 55R of 54L, 54R are formed in a circumferential surface having a curvature corresponding to the diameter of the rotor core. In addition, the tops of the respective winding supporting frames 54L, 54R hold down the upper surfaces of the stator windings 10L, 10R, and hold down plates 56L, 56R for regulating the above dimensions.
Are integrally formed.

As shown in FIG. 14, the stator winding is wound on one magnetic pole 5L and the facing magnetic pole 5R (not shown) of the stator core 5 in a state of being divided into two sets of 10L and 10R. . And one terminal wire 57 of the brake coil 57L of one stator winding 10L
LA is connected to the terminal 37 of the terminal plate 9, and the other terminal wire 57LB (not shown) of the brake coil 57L is connected to the terminal. One terminal wire 58LA of the main coil 58L of the stator winding 10L is connected to the terminal 36 of the terminal plate 9, and the other terminal wire 58LB of the main coil 58L.
(Not shown) is connected to the terminal 43. Further, one terminal wire of the brake coil 57R of the other stator winding 10R
57RA is connected to the terminal 38 of the terminal plate 9, and the other terminal wire 57RB (not shown) of the brake coil 57R is connected to the terminal 41. One terminal wire 58RA of the main coil 58R of the stator winding 10R is connected to the terminal plate 9R.
And the other terminal wire 58R of the same main coil 58R.
B (not shown) is connected to terminal 40.

Also, a stator winding 10L is attached to one magnetic pole 5L of the stator core 5.
However, when the stator winding 10R is wound around the magnetic pole 5R facing the magnetic pole 5L, a thin plate made of synthetic resin is formed so that the stator windings 10L and 10R and the stator core 5 do not directly contact each other. The flexible insulating sheet 72 is interposed between the stator core 5 and the respective stator windings 10L and 10R.

Incidentally, since the brake coils 57L and 57R are thinner than the main coils 58L and 58R, if the terminal wires 57LA, 57LB, 57RA, 57RB are pressed against the end face corners of the insulating sheet 72, a commutator motor The terminal wire may be peeled off at the contact portion by receiving the continuous rotation vibrations, and may be disconnected due to friction. Therefore, as shown in FIG. 15 as an example (an example of the terminal 37), a small projection 73 is formed below the inlet 37A formed in the terminal 37 to which the terminal wire 57LA of the brake coil 57L is connected. The terminal wire 57LA of the brake coil 57L is wired along the surface of the small projection 73 and connected to the terminal 37 via the inlet 37A, whereby the terminal wire 57LA receives vibration from the end face corner of the insulating sheet 72. It is to prevent. FIG. 15 shows an example of the terminal 37, but in addition, the terminal 42 to which the terminal wire 57LB of the brake coil 57L is connected, the terminal 38 to which the terminal wire 57RA of the brake coil 57R is connected, and the terminal of the brake coil 57R. Each of the terminals 41 to which the wire 57RB is connected also has the small protrusion
73 are formed.

FIG. 16 shows an example of the terminal wire 54LA of the brake coil 57L connected to the terminal 37, and the terminal wire 57LA is pressed and fixed by the terminal wire 58LA of the main coil 58L wired in an obliquely upward crossing direction, and is stable. This indicates that the wiring is performed in the state where the wiring is performed.

As shown in FIG. 16, the terminal wire 57L of the brake coil 57L
A is connected to the terminal 37 in a state of being slightly floated from the surface of the insulating sheet 72 by the small projection 73, and
58L terminal line 58LA is thinner than terminal line 58LA
The terminal wire 57LA is connected to the terminal 37 in a state where a sufficient pressing force is applied by the terminal wire 58LA because the terminal wire 57LA is wired to the terminal 36 so as to be pressed and crossed. Therefore, the shape of the brake coil 57L due to the detachment of the terminal wire 57LA from the brake coil 57L and the like is prevented, while the terminal wire 58LA is wired from obliquely downward to obliquely upward. It acts to prevent the shape from being lost. Fig. 16 shows the brake coil 57L
The relationship between the terminal line 57LA and the terminal line 58LA of the main coil 58L is shown, but the terminal line 57LB, the terminal line 58LB, and the terminal line 57
The same applies to the relationship between RA and terminal line 58RA and between terminal line 57RB and terminal line 58RB.

Next, the arrangement of the respective conductive plates provided on the terminal base 14 will be described.

FIG. 17 shows that when the terminal base 14 is integrally molded with a synthetic resin, the fixed terminals 24, 25, 26, 27 and the respective conductive plates on which the terminals 28 to 35 are formed at the terminal portions have a predetermined interval. 18 is a front view, FIG. 19 is a right side view, and FIG. 20 is a left side view.

As shown in FIGS. 17 to 20, the fixed terminal 24 and the terminal hole 61.62 are formed in the middle, and the brush holder 17B is electrically and mechanically connected to one of the terminal portions. A conductive plate 76 on which a conductive piece 75 is formed is arranged, and the other terminal of the conductive plate 76 is overlapped with one terminal of the conductive plate 77 at a joint 78.
The conductive plate 77 has one end overlapped with the conductive plate 76 at the joint 78 and the other end overlapped with the terminal of the conductive plate 80 at the joint 79.
In the conductive plate 77, a branch plate 77A is branched in the middle thereof, and the terminal 31 is formed at a terminal of the branch plate 77A. Further, the conductive plate 77 has a branch plate 77B branched in the middle thereof, and the terminal 33 is formed at an end of the branch plate 77B.

The conductive plate 80 is formed in the same shape as the conductive plate 76, and is arranged symmetrically with the conductive plate 76. Conductive plate
80, the fixed terminal 26 and the terminal holes 63 and 64 are formed, and one end portion is connected to the conductive plate 77 by the joint portion 79.
A brush holder conductive piece 81 is formed on the other terminal part, which is overlapped with the terminal part and electrically and mechanically connected to the brush holder 17A.

In addition, the terminal 28 is formed on one terminal, and the terminal 32 is formed on the other terminal.The conductive plate 82, the terminal 29 is on one terminal, and the fixed terminal 25 is on the other. A conductive plate 83 formed in a terminal portion, and a conductive plate formed in the terminal 30 on one terminal portion and the terminal 34 on the other terminal portion.
84, and a conductive plate 85 in which the fixed terminal 27 is formed at one end and the terminal 35 is formed at the other end.
Is provided.

As shown in FIG. 6, the joint 78 and the joint 79 are exposed to windows formed on the surface of the terminal base 14 formed of a synthetic resin, so that spot welding and cutting can be performed from the outside. It is formed to be possible. Then, by cutting either the joint 78 or the joint 79 and spot welding the other, it is possible to set the rotational direction of the commutator motor 2. This will be described later in detail with reference to an electric circuit. Further, the portions corresponding to the cutting windows 65 and 66 shown in FIG. 6 are indicated by two-dot chain lines in FIG.

In addition, in order to facilitate understanding of the entire configuration of the conductive plates 76, 77, 80, 82, 83, 84 and 85, the respective conductive plates are shown in FIGS. 21 to 34.

FIG. 21 is a plan view of the conductive plates 76 and 80, and FIG.
FIG. 23 is a view taken in the direction of arrows AA in FIG. 23, and FIG.
FIG. 24 is a plan view of the conductive plate 77, FIG. 25 is a view taken along the line AA in FIG. 24, and FIG.
FIG. 25 is a view as seen from the direction of arrows BB in FIG. 24. Figure 27 shows the conductive plate
FIG. 28 is a plan view of FIG. 82, and FIG. 28 is a view taken in the direction of arrows AA in FIG. No.
FIG. 29 is a plan view of the conductive plate 83, and FIG.
It is an arrow view. FIG. 31 is a plan view of the electric plate 84, and FIG. 32 is a view taken along the line AA of FIG. FIG. 33 is a plan view of the conductive plate 85, and FIG. 34 is a view taken along the line AA of FIG.

Next, FIG. 35 shows the brush holder 17A shown in FIG.
Terminal base with brush holders 90A and 90B that are more rectangular than 17B
14 shows a state in which the brush holder 14 is mounted on the mounting portion, and shows that it is possible to mount brushes or brush holders of various dimensions to the terminal base 14.

FIG. 36 shows the electric circuit of an electric drill 1 provided with a commutator motor 2 capable of braking.

In FIG. 36, 8 is a commutator, 24, 25, 26 and 27 are the fixed terminals provided on the terminal base 14, and 28, 2
Reference numerals 9,30,31,32,33,34 and 35 denote attached terminals provided on the terminal base 14. 36, 37, 38, 39, 40, 41, 42 and 43 are terminals provided on the terminal plate 9,
As described above, the terminal 28 of the terminal base 14 is inserted into the terminal 36, the terminal 29 is similarly inserted into the terminal 37, the terminal 38 is inserted into the terminal 38, and the terminal 30 is inserted into the terminal 39. The terminal 31, the terminal 32, the terminal 41, the terminal 33, the terminal 42, the terminal 34, and the terminal 43, the terminal 35, respectively, are inserted and electrically connected to the terminal 40. .

57L and 57R are brake coils as described above, and 58L and 58 are main coils. 60L and 60R are the choke coils respectively connected between the terminal holes 61 and 62 and between the terminal holes 63 and 64, and the conductive plates 76 and 80 are cut at the cutting windows 65 and 66, respectively. I have. Also, 78
Is a joint of each terminal of the conductive plates 76 and 77 as described above, and 79 is a joint of each terminal of the conductive plates 77 and 80 and sets the rotation direction of the commutator motor 2. At this time, either the joint 78 or the joint 79 is cut.

Reference numeral 90 denotes a switch of the electric drill 1. When a drive current is supplied to the commutator motor 2, the switch 90 is turned on to connect the contact terminals (a) and (c). On the other hand, when the rotation of the commutator motor 2 is stopped, by turning off the switch 90, the contact terminals (c) and (b) are connected, and the brake coils 57L and 57R become a kind of load. Dynamic braking.
Note that the lead wire 91 connected to the contact terminal (b) of the switch 90 is connected to either the fixed terminal 24 or the fixed terminal 26, and when the joint 78 is cut, It is connected to the fixed terminal 24 and is connected to the fixed terminal 26 when the joint 79 is cut. A capacitor (capacitor) for preventing radio interference may be connected between the unused terminal 24 or 26 and the contact terminal (c). One core wire 93 of the power cable 92 connected to the AC power supply is connected to the contact terminal (a) of the switch 90, and the other core wire 94 is connected to the fixed terminal 27 via a relay terminal or the like (not shown). I have. The contact terminal (b) of the switch 90 is connected to the fixed terminal 25 via the lead wire 95.

In the electric circuit configured as described above, when the switch 90 is turned on in a state where the joining portion 78 is cut and the lead wire 91 is connected to the fixed terminal 24, the current supplied from the AC power supply is turned on. Are the core wire 93 of the power cable 92-the contact terminal (a) of the switch 90-the contact terminal (c) of the switch 90
-Lead wire 90-Fixed terminal 24-Choke coil 60L-Plush 13B-Commutator 8-Rotor winding-Brush 13A-Choke coil 60R-Joint 79-Main coil 58R-Main coil 58L-Fixed terminal 27-Power cable It is energized by the loop of 92 core wires 94,
The commutator motor 2 is driven to rotate, for example, in the forward direction.

On the other hand, the joining portion 79 is cut and the lead wire
When the switch 90 is turned on while the terminal 91 is connected to the fixed terminal 26, the current supplied from the AC power supply
92 core wire 93-switch 90 contact terminal (a)-switch 90
Contact terminal (c), lead wire 91, fixed terminal 26, choke coil 60R, brush 13A, commutator 8, rotor winding, brush
13B-Choke coil 60L-Junction 78-Main coil 58R-Main coil 58L-Fixed terminal 27-Electricity is passed through the loop of the core wire 94 of the power cable 92. Thus, the commutator motor 2 is rotationally driven in the reverse direction.

Next, when the switch 90 is turned off to stop the rotation of the commutator motor 2 in the forward rotation state, the contact terminal (b) and the contact terminal (c) of the switch 90 are connected.
The following opening / closing loop is formed. That is, switch 90
Contact terminal (c)-contact terminal (b) of the same switch 90-lead wire 95-fixed terminal 25-brake coil 57L-brake coil 57R-joint 79-choke coil 60R-brush 13A
-Commutator 8-Rotor winding-Brush 13B-Choke coil 6
A closed loop of 0L-fixed terminal 24-lead wire 91-contact terminal (c) of switch 90 is formed, and brake coils 57L and 57R
Is a load resistance, dynamic braking is applied, and the rotation of the electric motor 2 is suddenly stopped. Also, in the reverse rotation state, braking is applied in the same manner as described above.

Next, a second embodiment using a stator core of the type in which the brake coil described in the first embodiment is not wound, that is, a type in which only the main coil is wound, is used in the commutator motor.
This will be described as an example.

As shown in FIG. 37, the upper end surface of the stator core 5 formed in the same manner as in the first embodiment is formed of a first resin
A terminal plate 9 similar to that of the embodiment is mounted as an insulation frame for each of the stator windings 102L and 102R, which will be described later, which is divided and wound into two parts, and also for preventing the winding from collapsing. A pluggable terminal is attached as in the first embodiment. Also, a terminal plate 11 having a similar shape is attached to the lower end face of the stator core 5 as in the first embodiment.

On the other hand, the same brushes 13A, 13B, etc. as in the first embodiment, which make contact with the commutator 8 formed in the same manner as in the first embodiment so as to be able to conduct electricity and energize the rotor winding wound around the rotor. Is attached to the terminal plate 9.

The brush 13 is provided on the upper surface of the terminal base 104.
A and 13B are attached, and brush holders 17A and 17B electrically connected to brush lead wires 13AL and 13BL connected to the brushes 13A and 13B are attached.
In order to press the respective end surfaces of A and 13B against the commutator 8, coil-shaped brush springs 18A and 18B formed of a thin plate-like spring material are attached to brush spring holders 19A and 19B. The first embodiment is such that the front ends 18AF, 18BF of the brush springs 18A, 18B abut against the rear end surfaces of the brushes 13A, 13B, respectively, and apply a pressing force from behind the brushes 13A, 13B. Is the same as

On the other hand, the brush springs 18A and 18B
In the state where the brushes 8AF and 18BF are in contact with the side surfaces of the brushes 13A and 13B, the brushes 13A and 13B also have a function of holding the brushes 13A and 13B at a position away from the commutator 8 as in the first embodiment. .

FIG. 38 is a plan view of the terminal base 104 detached from the terminal plate 9, and FIG.
04 is a front view, and FIG. 40 is a right side view of the terminal base 104.

As shown in FIGS. 38 to 40, the terminal base 104
The brush holders 17A and 17B for inserting the brushes 13A and 13B respectively, the brush springs 18A and 18B, and the brush spring holders 19A and 19B on which the brush springs 18A and 18B are mounted. And fixed terminals 107 and 108 into which terminals of a lead wire terminal connected to a switch or the like of the electric drill 1 are inserted. The fixed terminals 107 and 108 are erected on a main body 104A formed of a synthetic resin, and each fixed terminal is formed on a terminal portion of a conductive plate described later,
An intermediate portion of the conductive plate is embedded in the main body 104A of the synthetic resin.

On the other hand, on the lower surface of the terminal base 104, terminals 109, 110, 111, 112 each having a small flat plate shape are provided.
Each of the flat terminals 109 to 112 is an insertion type terminal provided on the terminal plate 9 similar to the first embodiment.
36, 39, 40, and 43 are inserted and electrically contacted respectively. The terminals 109 to 112 are formed at terminal portions of a conductive plate described later, and an intermediate portion of the conductive plate is embedded in a synthetic resin portion of the main body 104A. In addition, four lock pieces 117, 118, 119, 120 are provided on the lower surface of the terminal base 104.
Are extended, and lock claws 121, 122, 123, and 124 are formed at the terminal portions of the lock pieces 117 to 120, respectively. As shown in FIG. 37, the lock claws 121 to 124 are hooked on the hooks of the terminal plate 9.
As a result, the terminal base 104 and the terminal plate 9 are latched in a retaining shape. Further, hooks 117a to 120a for removing the lock claws 121 to 124 are formed on the outer lower end surfaces of the lock pieces 117 to 120.

In addition, as described above, the upper surface of the terminal base 104 is provided with the brush holders 17A and 17B, the brush springs 18A and 18B, the brush spring holders 19A and 19B, the fixed terminals 107 and 108, and the like. Similarly, terminal holes 125, 1 for connecting choke coils 60L, 60R for attenuating noise generated at the contact portion between commutator 8 and brushes 13A, 13B.
26 and 127,128 are provided. Also, terminal holes 125 and 12
6, and between the terminal holes 127 and 128 are usually short-circuited by a conductive plate described later, and the choke coils 60L and 60R are connected between the terminal holes 125 and 126 and the terminal holes 127 and 128. Then, the conductive plate is cut by the cutting windows 129 and 130, and the drive current for the rotating winding is caused to flow through the choke coils 60L and 60R. Further, the brush holders 17A and 17B are provided with brush holder terminals 17AT and 17BT, respectively, as in the first embodiment. Further, a plurality of small lead wire guide pieces 131 are formed from the upper end face of the terminal base 104.
Is formed in a drooping shape, for example, to guide the lead wire connected to the fixed terminal 108 so as not to protrude from the outer peripheral portion of the terminal base 104, and to guide the lead wire guided by the lead wire guide piece 131. Are formed in the outer peripheral portion of the terminal base 104 as in the first embodiment.

In addition, a commutator insertion hole 133 for inserting the commutator 8 through a required gap is formed in the terminal base 104 in a circular shape.

Terminal plate 9 formed in the same manner as in the first embodiment
Is attached to the end face of the stator core 5 as described above, and includes a plurality of insertion-type terminals to which the respective terminal wires of the stator windings 102L and 102R are connected. The winding supporting frames 54L and 54R for holding the wires 102L and 102R so as not to be deformed are provided, and the winding supporting frames 54L and 54R are formed integrally with the first embodiment. The same is true. One terminal wire 102LA of the stator winding 102L is connected to the terminal 36 of the terminal plate 9, and the other terminal wire 102LB of the same winding 102L is connected to the terminal 43. One terminal wire 102RA of the stator winding 102R is connected to the terminal 39 of the terminal plate 9, and the other terminal wire 102RB is connected to the terminal 40.

Next, the arrangement of the respective conductive plates provided on the terminal base 104 will be described.

FIG. 41 shows a state where the fixed bases 107 and 108 and the terminals 109 to 112 are formed at the terminal portions at a predetermined interval when the terminal base 104 is integrally molded with a synthetic resin. FIG. 42 is a front view, FIG. 43 is a right side view, and FIG. 44 is a left side view.

As shown in FIGS. 41 to 44, the terminal base
The conductive plate attached to 104 has the fixed terminal 107 formed at one terminal and the terminal 109 formed at the other terminal, and the conductive plate 141 is disposed symmetrically with the conductive plate 141 so that the fixed terminal 107 is fixed. A terminal 108 is formed at one end, and a conductive plate 142 having the terminal 111 formed at the other end, and one end 143 is formed so as to be electrically and mechanically connected to the brush holder 17A. At the same time, the opposite end portion 144 is electrically and mechanically coupled to the brush holder 17B, and further, the branch conductive plate 145 branched from the middle portion has terminal holes 125 and 126 to which the choke coil 60L is connected. The terminal portion has a conductive plate 146 on which the terminal 112 is formed.
And one end 147 is formed so as to be electrically and mechanically coupled to the brush holder 17B, and the other end 148 is formed in the brush holder 17A.
The terminal holes 127 and 128 to which the choke coil 60R is connected are formed in the branch conductive plate 149 that is formed so as to be electrically and mechanically coupled to the middle portion, and the terminal hole thereof is formed. For the portion, each of the conductive plates 150 on which the terminals 110 are formed is used.

As shown in FIG. 38, in addition to the connection windows 129 and 130, cutting windows 151 and 15 are provided on the upper surface of the terminal base 104.
2,153 and 154 are formed, and corresponding portions of the conductive plate 146 exposed to the respective cutting windows 151 and 152 are shown as cut portions 151A and 152A in FIG.
The corresponding portions of the conductive plate 150 that are exposed to the respective portions 3154 are shown as cut portions 153A and 154A. Then, for example, when the cutting section 152A and the cutting section 154A are cut,
Commutator motor 2 when 151A and cutting section 153A are cut
An electric circuit is configured such that the rotation direction of the electric circuit is changed.

Further, a corresponding portion of the conductive plate 146 where the cutting window 129 is exposed is shown as a cutting portion 129A in FIG. 41, and a corresponding portion of the conductive plate 150 which is exposed to the cutting window 130 is shown as a cutting portion 130A. I have. Then, when the choke coils 60L and 60R are connected to the corresponding terminal holes, the cut portions 129A and 130A are cut.

FIG. 45 is a plan view of the conductive plate 146 and a conductive plate 150 having the same shape as the conductive plate 146, FIG. 46 is a front view of the conductive plate, and FIG. 47 is a right side view of the conductive plate. FIG. 48 is a plan view of the conductive plate 141 and the conductive plate 142 alone, and FIG. 49 is a front view of the conductive plate 141 and the conductive plate 142 alone.

FIG. 50 shows a state in which brush holders 90A and 90B shorter than the brush holders 17A and 17B are attached to the terminal base 104. As in the first embodiment, the terminal base 104 has various lengths. It shows that it is possible to attach a brush.

 FIG. 51 is an electric circuit diagram of the second embodiment.

In the figure, 107 and 108 are the fixed terminals, and the fixed terminal 107 is connected to the contact terminal (b) of the switch 156 by a lead wire 155. The contact terminal (a) of the switch 156 is connected to one core wire 157A of the power cable 157. On the other hand, the fixed terminal 108 is electrically connected to the other core wire 157B of the power cable 157 via a relay terminal (not shown).

109, 110, 111, and 112 are the insertion-type terminals formed on the terminal base 104; 36, 39, 40, and 43 are the insertion-type terminals provided on the terminal plate 9; Terminal 109 of terminal base 104, terminal 110 similarly to terminal 39, terminal 111 to terminal 40, terminal 43
The terminal 112 is inserted and connected to. 125, 126 and 127, 128 are respectively connected to the choke coils 60L, 60R and are the terminal holes, and 102L and 102R are the stator windings.

Further, 151A, 152A, 153A and 154A are the cutting portions. When the commutator motor 2 is to be rotated forward, for example, the cutting portion 152A and the cutting portion 154A are both cut while the commutator motor 2 is cut. When the child motor 2 is rotated in the reverse direction, the cutting portion 15 is used.
Both 1A and the cutting section 153A are cut.

Therefore, when the switch 156 is turned on with the cutting sections 152A and 154A disconnected, the drive current from the AC power supply is applied to the core 157A of the power cable 157, the switch 156, and the lead 155.
−Fixed terminal 107−Stator winding 102L−Choke coil 60L−
Cutting section 151A-brush 13B-commutator 8-rotor winding-brush 13A-cutting section 153A-choke coil 60R-stator winding 10
Power is supplied through the loop of 2R-fixed terminal 108-core 157B, and commutator electric machine 2 is rotated.

On the other hand, when the switch 156 is turned on in a state where the cutting portions 151A and 153A are cut, the direction of the current flowing through the stator winding via the commutator 8 changes when the cutting portions 152A and 154A are cut. Of the commutator motor 2
Will rotate in reverse.

(Effects of the Invention) As described above, according to the present invention, the commutator motor rotates only by cutting either the cut part of the forward conductive path or the cut part of the reverse conductive path provided on the terminal base. Since the direction is set, when the present commutator motor is used for a power tool or the like, the rotation direction of the commutator motor corresponding to the type of the power tool or the like can be easily and reliably set. There is an effect that the man-hour for assembling the tool can be reduced and the productivity of the electric tool and the like can be improved.

[Brief description of the drawings]

The drawings relate to an embodiment, and FIG. 1 is a partially cutaway front view of an electric drill incorporating a commutator motor according to the present invention. FIGS. 2 to 36 relate to the first embodiment, and FIGS.
The drawing is a drawing relating to the second embodiment. FIG. 2 is an external perspective view showing a state in which a terminal base is fixedly connected to a terminal plate attached to one end face of the stator core, and FIG. 3 shows a state in which the brush is pressed against the commutator. FIG. 4 is an external perspective view showing a state in which the brush is held at a position away from the commutator, FIG. 5 is an external perspective view of a terminal base, FIG. 6 is a plan view of the terminal base, FIG. 7 is a front view of the terminal base, FIG. 8 is a right side view of the terminal base, FIG.
FIG. 10 is an external perspective view partially showing a lead wiring state in a terminal base, FIG. 10 is an external perspective view of a terminal plate, FIG. 11 is a plan view of the terminal plate, and FIG.
Fig. 12 is the front view of the terminal plate, Fig. 13 is the right side view of the terminal plate, and Fig. 14 is the terminal plate attached to one end face of the stator core and the terminal wire of the stator winding is inserted into the terminal plate. FIG. 15 is a partially enlarged perspective view of FIG. 14, and FIG. 16 is a state of mutual connection between a terminal wire of a main coil and a terminal wire of a brake coil. FIG. 17 is a plan view showing the arrangement of the conductive plates of the terminal base, FIG. 18 is a front view of FIG. 17, FIG. 19 is a right side view of FIG. 18, and FIG. FIG. 18 is a left side view, FIG. 21 is a plan view of conductive plates 76 and 80, and FIG.
FIG. 22 is a view taken along the line AA of FIG. 21, and FIG. 23 is a view taken along the line BB of FIG.
FIG. 24 is a plan view of the conductive plate 77, FIG. 25 is a view taken along the line AA of FIG. 24, FIG. 26 is a view taken along the line BB of FIG. 24, and FIG. FIG. 28 is a plan view of the plate 82, FIG.
FIG. 29 is a plan view of the conductive plate 83, FIG. 30 is a view taken along the line AA of FIG. 29, FIG. 31 is a plan view of the conductive plate 84, and FIG.
FIG. 33 is a plan view of the conductive plate 85, FIG.
35 is a plan view of the terminal base when the brush attached to the terminal base is a rectangular brush, and FIG. 36 is an electric circuit diagram. FIG. 37 is an external perspective view showing a state in which the terminal base of the second embodiment is connected and fixed to a terminal plate attached to one end face of the stator core. FIG. 38 is a plan view of the terminal base. 39 is a front view of the terminal base, FIG. 40 is a right side view of the terminal base, FIG. 41 is a plan view showing the arrangement of the conductive plates of the terminal base, FIG. 42 is a front view of FIG. 41, FIG. 42 is a right side view of FIG. 42, FIG. 44 is a left side view of FIG. 42, FIG. 45 is a plan view of the conductive plates 146 and 150, and FIG.
45 is a front view of FIG. 47, FIG. 47 is a right side view of FIG. 45, FIG. 48 is a plan view of the conductive plates 141 and 142, FIG. 49 is a front view of FIG.
FIG. 50 is a plan view of the terminal base when the brush attached to the terminal base is a rectangular brush, and FIG. 51 is an electric circuit diagram. DESCRIPTION OF SYMBOLS 1 ... Electric drill 2 ... Commutator motor 3 ... Housing 5 ... Stator core 8 ... Commutator 9 ... Terminal plate 10R, 10L, 102L, 102R ... Stator winding 13A, 13B ... Brush 14,104 terminal base 17A, 17B brush holder 18A, 18B brush spring 24,25,26,27,107,108 fixed terminal 28,29,30,31,32,33,34,35,109,110,111,112 Terminals 36,37,38,39,40,41,42,43 …… insertable terminals 44,45,46,47,117,118,119,120 …… Lock pieces 48,49,50,51,121,122,123,124 …… Lock claws 53A, 53B, 53C, 53D …… Fixing pawl 57L, 57R …… Brake coil 58L, 58R …… Main coil 57LA, 57LB, 57RA, 57RB …… Brake coil terminal wire 58LA, 58LB, 58RA, 58RB …… Main coil terminal wire 67,131 …… Lead wire guide piece 68,132 Lead wire guide hole 73 Small projection 78,79 Joint 76,77,80,82,83,84,85,141,142,146,150 Conductive plate 151A, 152A, 153A, 154A Cutting Department

Claims (1)

(57) [Claims] A stator having a required stator winding wound on each of magnetic poles is connected to one end face of the stator winding on one end face thereof and an external terminal to be inserted is provided. A terminal plate provided with a plug-in type terminal for plug-in connection is attached and fixed, while the terminal plate is provided with the plug-in terminal, and contacts a commutator to allow a required current to flow through a rotor winding. Commutator motor in which a required electrical connection is made by directly connecting a terminal base provided with a fixed terminal or the like for connecting a lead wire from a brush assembly portion and a power switch or the like to the terminal plate. In the terminal base, a conductive path of a forward direction conductive path and a reverse direction conductive path of a current supplied to the rotor winding via the commutator are formed in advance, Rectification characterized in that cut portions for cutting off the energization of the forward conductive path or the reverse conductive path are provided in each of the forward conductive path and the reverse conductive path corresponding to the rotation direction of the rotor. Child electric motor.