JPH01174252A - Commutator motor - Google Patents

Abstract

PURPOSE:To make it possible to set the direction of rotation of a commutator motor only by cutting off either of conductive paths, by providing a cutting off section of a conductive path in the forward direction and a cutting off section of a conductive path in the reverse direction on a terminal base. CONSTITUTION:A terminal plate 9 is mounted on the upper end of a stator core 5. A terminal base 14 is directly coupled with the terminal plate 9, and a required electrical connection is made. A conductive path in the forward direction for supplying the energizing current in the forward direction to a rotor winding through a commutator and a conductive path in the reverse direction for supplying the energizing current in the reverse direction are formed on the terminal base 14 in advance. The direction of rotation of a commutator motor is set by cutting off either of these conductive paths.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a commutator motor used in power tools, etc., and more specifically, the rotation direction of the commutator motor can be set extremely easily when the commutator motor is assembled. 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 depending on the type of power tool, etc., and then,
A method was adopted in which electrical wiring was used to rotate the commutator motor in the determined rotational direction.

(Problems to be Solved by the Invention) In the case of the above-mentioned conventional commutator motor, the rotation direction of the motor is determined according to the type of power tool etc. that uses the motor, and the motor corresponds to the determined rotation direction. Since the method of individually connecting wires was adopted, there were problems such as errors in wiring connections and an increase in the number of work steps.

Therefore, in the present invention, energizing paths corresponding to each rotational direction of the rectifying and pre-energizing VJ machine are formed in advance on the terminal base, leaving one energizing path corresponding to the desired rotational direction, and cutting off the other energizing path. The technical problem to be solved is to be able to extremely easily and reliably set the rotation direction of the rectified pre-charge vJIa by means of the present invention.

(Means for solving the problem) The technical means for solving the above problem is to install a stator on one end face of the stator, in which the required stator windings are wound around each of the magnetic poles.
Each terminal wire of the stator winding is connected, and a terminal plate provided with an insertable terminal for connecting an external terminal to be inserted is attached and fixed, while A terminal base that is equipped with a brush assembly section that contacts the commutator and supplies the required current to the rotor windings, and a fixed terminal that connects a lead wire from a power switch, etc. in a commutator motor in which the required electrical connection is made by directly coupling the terminal plate to the terminal plate, the terminal base has a positive direction of current carried through the commutator to the rotor winding. Each of the conductive path and the reverse conductive path is formed in advance, and a cutting portion for interrupting the current flow in the forward conductive path or the reverse conductive path is formed in the forward direction in accordance with the rotational direction of the rotor. The present invention is to provide a configuration in which each of the direction conductive path and the reverse direction conductive path is provided.

(Function) According to the commutator motor having the above configuration, the terminal base includes the positive conduction path for passing the energizing current to the rotor winding through the commutator in the positive direction; A reverse conduction path is formed in advance to allow the current to flow in the opposite direction, and in order to rotate the commutator motor in the forward direction, for example, it is necessary to select the forward conduction path. Cut the cut formed in the path.

On the other hand, in order to rotate the commutator motor in the reverse direction, it is necessary to select a reverse conduction path, so the cut portion formed in the forward conduction path is cut. By performing the above-described cutting process, the forward conduction path or the reverse conduction path is selected, and when a driving force a'Fi is supplied from the outside,
A drive current is applied to the rotor winding of the commutator tan through the selected forward conduction path or reverse conduction path, so that the rotor of the commutator motor is rotated in the forward or reverse direction.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

In addition, in the text describing the embodiments, descriptions indicating directions such as top, bottom, left, right, etc. indicate directions on the drawings.

FIG. 1 is a partially cutaway front view of an electric drill 1 with a commutator motor 2 installed therein.

As shown in FIG. 1, the commutator motor 2 is attached with a stator core 5 fitted into a rib 4 formed on the inner surface of a housing 3 forming the body of the electric drill 1. The rotor shaft 6 attached to the rotor of the rectified pre-electrostatic a If 2 is supported by a bearing 7 at the rear end, and is engaged with the rotating part 1A of the electric drill 1 at the front end,
In addition, a commutator 8 is attached.

Next, a first embodiment of the type in which a brake coil and a main coil, which will be described later, are wound around a stator core 5 will be described with reference to FIGS. 2 to 36.

As shown in FIG. 2, a terminal plate 9 formed of a resin material is provided on the upper end surface of the stator core 5, and a stator winding 101 is divided into two and wound as shown in FIG. 14, which will be described later. ．．
It is attached to each 10R insulating frame and to prevent the winding shape from collapsing. Note that a terminal plate 11 having a similar shape is attached to the lower end surface of the stator core 5, but no electrical connection is made to the terminal plate 11, and the stator winding 10L and IOR are connected to each other. It only has the function of preventing the insulation frame and winding wire from collapsing.

On the other hand, brushes 13A, 1 contact the commutator 8 in an energized manner and energize the rotor windings wound around the rotor.
A terminal base 14 to which 3B and the like are attached is attached to the terminal plate 9.

Further, as shown in FIG. 2, the brushes 13A and 13B are inserted into the upper surface of the terminal base 14, and a brush lead wire 13A is connected to the brushes 13A and 13B.
Brush holder 17A electrically connected to L and 13BL
, 17B are attached, and the brush 13A is also attached.
, 13B, coil-shaped brush springs 18A and 18B formed of thin plate-like spring material are attached to the brush spring holder 1 in order to press the respective tip surfaces of the brush springs 18A and 13B into pressure contact with the commutator 8.
9A and 19B, and the tips 18AF and 188F of these brush springs 18A and 18B, respectively.
comes into contact with the respective rear end surfaces of the brushes 13A and 13B,
Pressing force is applied from behind the brushes 13A, 13B. Note that FIG. 3 is a partially detailed diagram of the above state.

On the other hand, as shown in FIG.
It also has the function of holding the brushes 13A, 13B at a position away from the commutator 8 while in contact with the side surfaces of the brushes 3A, 13B. That is, as shown in the partial detail view of FIG.
The brush 13A (13
B) is in contact with the side surface of the brush spring 18A (
The brush 13A (13B> is attached to the brush holder 17A due to the pressing force of the brush 18B) against the side surface of the brush 13A (13B).
It is pressed against the inner surface of (17B) and can be held at that level n.

In this state, the brush 13A (13B) is artificially pushed out from behind, and the brush spring 18A.

The tip part 18AF (188F) of 18B is the brush 13A
When the brush 13A (13B) changes from contacting the side surface to contacting the rear end surface, the brush 13A (13B) comes into contact with the commutator 8 as shown in FIG. That is, the brush brig 18A (18B) is the brush brig 13A (13B).
B) has the function of pressing the brush 13A (13B) into contact with the commutator 8, while holding the brush 13A (13B) in a position where it does not come into contact with the commutator 8. For example, after the terminal base 14 is assembled to the terminal plate 9, the stator The rotor is inserted into the rotor, and the brushes 13A (13B) are brought into contact with the commutator 8. Therefore, it is possible to bring the brush 13A (13B) into sufficient contact with the commutator 8 by simply pushing the brush 13A (13B) from the rear end surface direction, thereby increasing the assembly efficiency.

5 is an external perspective view of the terminal base 14 removed from the terminal plate 9, FIG. 6 is a plan view of the terminal base 14, FIG. 7 is a front view of the terminal base 14, and FIG. 8 is a view of the terminal base 14. It is a right side view.

As shown in FIGS. 5 to 8, the upper surface of the terminal base 14 includes the brush holders 17A and 17B into which the brushes 13A and 13B are inserted, respectively, and the brush spring 18A.

18B, and brush spring holders 19A and 19B supporting the brush springs 18A and 18B are provided, and terminals 20, 21, 22, and 23 of the lead wire terminals connected to the switch etc. of the electric drill 1 are provided, respectively. Fixed terminals 24, 25, 26, 27 into which are inserted are provided. The fixed terminals 24, 25, 26, and 27 are erected on the main body 14A made of synthetic resin, and each of the fixed terminals is formed at the end of a conductive plate, which will be described later. The middle portion is buried in the main body portion 14A made of the synthetic resin.

On the other hand, on the lower surface of the terminal base 14, small width and flat plate-shaped insertion terminals 28, 29, 30, 31, 32, 33 are provided.
．． 34 and 35 are respectively provided, and each of the flat terminals 28 to 35 is connected to the terminal plate 9.
A plurality of plug-in terminals 36, 37, 38 described below provided in
．． 39.40°41.42.43 respectively,
It is something that is electrically contacted. The terminals 28 to 35 are formed at the end portions of a conductive plate, which will be described later, and the middle portion of the conductive plate is embedded in the synthetic resin portion of the main body portion 14A. Further, four lock pieces 44, 45, 46, and 47 extend from the lower surface of the terminal base 14, and lock claws 48.
49.50.51 are formed. Same lock claw 48~
Reference numeral 51 is latched to a latching portion of the terminal plate 9, as shown in FIG.
4 and the terminal plate 9 are latched to prevent them from coming off.

In addition, from the terminal plate 9 to the terminal base 14
In order to remove the lock claws 48 to 51 from the hooking portion, the lock claws 48 to 51 can be easily removed from the hook by pulling the release hooks 448 to 47a formed on the outer lower end surfaces of the lock pieces 44 to 47 outward. It can be removed.

As shown in FIG. 6, on the upper surface of the terminal base 14 are brush holders 17A, 17B1, brush springs 18A, 18B, and brush spring holder 19A.
, 19B1 Fixed terminal 24゜25.26.27, etc. is provided with a terminal for connecting a choke coil 601.60R for attenuating noise generated at the contact portion between the commutator 8 and the brushes 13A and 13B. Holes 61, -62 and 63.64 are provided. In addition, terminal holes 61 and 62
and between the terminal holes 63 and 64 are normally short-circuited by a conductive plate, which will be described later, so that the choke coil 60
When connecting the choke coil 601.6OR between the terminal holes 61 and 62 and the terminal holes 63 and 64, the conductive plate is cut using the cutting windows 65 and 66, and the choke coil 601.6OR is connected between the terminal holes 61.62 and 63.60R. Soldering or spot welding is performed at 64 so that the drive current for the rotor windings flows through the choke coil 601.60R.

In addition, each of the two sets of brush holders 17A and 17B has one brush 13A and one brush holder attached to the brush holder 17A and 17B.
3B, the brush holder terminals 17AT, 1 connect the brush lead wire 13AL (138L) (see FIG. 2) connected to the brush 13Δ (13B).
7BT is provided.

Further, as shown in FIG. 7, a plurality of small lead wire guide pieces 67 are formed to hang down from the upper end surface of the terminal base 14, so that the lead wires connected to the fixed terminals 24 to 27 can be guided. It has the role of guiding the terminal base 14 so that it does not protrude from the outer periphery. Further, a plurality of lead wire guide holes 68 are formed in the outer peripheral portion of the terminal base 14, through which the lead wires guided by the lead wire guide pieces 67 are inserted. FIG. 9 illustrates the guiding state of the lead wire, taking the lead wire 23L as an example.
7 and a lead wire guide hole 68, showing that the lead wires are wired in a stable state.

Further, as shown in FIG. 6, the terminal base 14 has six circular commutator insertion holes through which the commutator 8 is inserted through a required gap, and the commutator 8 is rotated. Brush 13△.

A blocking plate 701.70R is provided at the edge of the commutator insertion hole 69 to block the carbon powder generated when contact with the commutator 13B from spreading and to prevent contact between the lead wire and the commutator 8. They are formed facing each other along the line. The facing surfaces of the blocking plates 70L and 70R are each formed into a curved surface having a curvature corresponding to the diameter of the commutator 8.

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

The terminal plate 9 is attached to the end face of the stator core 5 as described above, and is connected to the stator winding 10L, IO
A plurality of terminals 36 to 4 to which respective terminal lines of R are connected
3 are each fixed to a terminal insertion cavity formed integrally with the main body. Also, terminal plate 9
As shown in FIG. 2, the lower end surface of the terminal plate 9 has a plurality of small widths 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. 4 fixed claws 53A, 53 fitted to each of 52
8.53C and 53D are integrally molded. On the other hand, the stator winding 101 is provided on the upper surface of the terminal plate 9.
．． Two sets of winding support frames 54m and 54R are formed facing each other to hold each of the winding wires 10R so as not to be deformed. And each winding support frame 54L, 54R
The opposing surfaces 55L and 55R are formed in the shape of a circumferential surface with a curvature corresponding to the diameter of the rotor core. Further, the stator winding 1 is provided at the top of each winding support frame 54L, 54R.
Holding plates 56L and 56R are integrally formed to hold down the upper surfaces of 0L and IOR and to regulate the dimensions of the upper surfaces.

As shown in FIG. 14, the stator winding is divided into two sets, 10L and 1OR.
m and the facing magnetic pole 5R (not shown). And one stator winding 1°L brake coil 57
One terminal wire 57LA of the brake coil 57L is connected to the terminal 37 of the terminal plate 9, and the other terminal I! of the brake coil 57L is connected to the terminal 37 of the terminal plate 9. 571B (not shown) is connected to terminal 42.

Further, one terminal line 58LA of the main coil 58m of the stator winding 10L is connected to the terminal 36 of the terminal plate 9, and the other terminal line 581B (not shown) of the main coil 58L is connected to the terminal 43. has been done. Furthermore, one terminal wire 57RA of the brake coil 57R of the other stator winding 10R is connected to the terminal 38 of the terminal plate 9, and the other terminal wire 57R of the brake coil 57R is connected to the terminal 38 of the terminal plate 9.
B (not shown) is connected to terminal 41. Also,
One terminal wire 5 of the main coil 58R of the stator winding 10R
8RA is connected to the terminal 39 of the terminal plate 9, and the other terminal wire 58RB (not shown) of the main coil 58R is connected to the terminal 40.

Furthermore, a stator winding 10 is attached to one magnetic pole 5L of the stator core 5.
m is also connected to the stator winding 1 on the magnetic pole 5R facing the magnetic pole 5L.
When 0R is wound, fixed pre-winding It! 101.1O
A thin flexible insulating sheet 72 made of synthetic resin is inserted between the stator core 5 and each of the stator windings 101.10R to prevent direct contact between the stator core 5 and the stator core 5.
It is interposed between.

By the way, since the brake coils 57L and 57R are thinner than the main coils 581 and 58R, the terminal wires 57LA and 571 are attached to the end face corners of the insulating sheet 72.
When B, 57RA, and 57RB are pressed, the coating of the terminal wire may peel off at the contact portion due to continuous synchronous vibration of the commutator motor 2, and the wire may be broken due to friction. Therefore, as shown in FIG. 15 (an example of the terminal 37), the brake coil 57
A small protrusion 73 is formed on the lower side of the input line 37A formed on the terminal 37 to which the terminal line 57LA of m is connected, and this small protrusion 7
Terminal line 57L of brake coil 57m along the surface of 3.
By wiring A and connecting it to the terminal 37 through the wire entry port 37A, the terminal wire 57LA is prevented from receiving vibration from the end face corner of the insulating sheet 72.

Although Fig. 15 shows an example of the terminal 37, there are also terminals 42 to which the terminal wire 571B of the brake coil 57L is connected, terminal 38 to which the terminal wire 57RA of the brake coil 57R is connected, and terminal 38 to which the terminal wire 57RA of the brake coil 57R is connected. Terminal 1! J5
Each of the terminals 41 to which 7RB is connected also has the small protrusion 7
3 is formed.

Figure 1.6 shows the brake coil 57 connected to the terminal 37.
Taking terminal 1!57LA of L as an example, the same terminal line 57LA
The main coil 58m is pressed and fixed by the terminal wire 58LA of the main coil 58m, which is wired diagonally upward in a crosswise manner, and is wired in a stable state.

As shown in FIG. 16, the terminal wire 57LA of the brake coil 57L is connected to the terminal 37 in a state slightly lifted from the surface of the insulating sheet 72 by the small protrusion 73, and the terminal wire 58LA of the main coil 58L However, the same terminal line 58
Since the terminal wire 57LA, which is thinner than LA, is wired crosswise and connected to the terminal 36, the terminal wire 57LA is applied with sufficient pressing force by the terminal wire 58LA to the terminal 37. It is connected. Therefore,
While preventing deformation of the brake coil 57L due to separation of the terminal wire 57LA from the brake coil 57L portion, etc., the terminal wire 58LA is wired from diagonally downward to diagonally upward, so that the shape of the main coil 58m is prevented. Acts to prevent collapse. In addition, Fig. 16 shows the brake coil 5.
The relationship between the terminal 1157 LA of 7L and the terminal wire 58LA of the main coil 58L is shown, but in the same way, the terminal wire 571B
and terminal line 581B, terminal line 57RA and terminal 1i158R
A, and the relationship between the terminal line 57RB and the terminal line 58RB is also the same.

Next, the arrangement of each S electric board provided on the terminal base 14 will be explained.

FIG. 17 shows that when the terminal base 14 is integrally molded with synthetic resin, the fixed terminals 24, 25.
26. 27 and the respective conductive plates on which the terminals 28 to 35 are formed are arranged with required intervals, FIG. 18 is a front view thereof, FIG. 19 is a right side view, and FIG.
The figure is a left side view.

As shown in FIGS. 17 to 20, the fixed terminal 24 and the terminal holes 61 and 62 are formed in the middle,
A conductive plate 76 having a brush holder conductive piece 75 to which the brush holder 17B is electrically and mechanically connected is disposed at one end, and the other end of the conductive plate 76 is connected to a joint 78. The conductive plate 77 is overlapped with one end portion of the conductive plate 77 . The conductive plate 77 is overlapped with the conductive plate 76 at the joint 78 at one end, and the conductive plate 80 is overlapped at the joint 79 at the other end.
It is overlapped with the terminal part of. Further, the conductive plate 77 has a branch plate 77A branched in the middle thereof.
The terminal 31 is formed at the terminal. Furthermore, W
? A branch plate 77B is branched in the middle of the upper plate 7 of the H plate 7, and the terminal 33 is formed at the end of the branch plate 77B.

The conductive plate 80 has the same shape as the conductive plate 76, and is arranged symmetrically with the conductive plate 76. The fixed terminal 26 and the terminal holes 63 and 64 are formed in the conductive plate 80, one end portion is overlapped with the end portion of the conductive plate 77 at the joint portion 7, and the other end is overlapped with the end portion of the conductive plate 77 at the joint portion 7. A brush holder conductive piece 81 to which the brush holder 17A is electrically and mechanically connected is formed in the portion.

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

Note that, as shown in FIG.
It is exposed through a window formed on the surface of 4, and is formed so that it can be spot welded and cut from the outside. By cutting one of the joint parts 78 and 79 and spot welding the other, it is possible to set the rotation direction of the commutator electric rock 2.

This will be explained in detail later with reference to electrical circuits. Further, portions corresponding to the cutting windows 65 and 66 shown in FIG. 6 are indicated by two-dot chain lines in FIG. 17.

In addition, the above conductive plate 7.6.77.80.82.83.8
In order to facilitate understanding of the overall structure according to 4 and 85,
The respective conductive plates are shown in FIGS. 21 to 34.

21 is a plan view of the conductive plates 76 and 80, FIG. 22 is a view taken along the line A-A in FIG. 21, and FIG. 23 is a view taken along the line B-B in FIG. 21. Further, FIG. 24 is a plan view of the conductive plate 77, and FIG. 25 is a plan view of the conductive plate 77, and FIG.
26 is a view taken along arrow B-8 in FIG. 24. FIG. 27 is a plan view of the conductive plate 82, and FIG. 28 is a view taken along the line A--A in FIG. 27. FIG. 29 is a plan view of the conductive plate 83, and FIG. 30 is a view taken along the line A--A in FIG. 29. FIG. 31 is a plan view of the conductive plate 84, and FIG. 32 is a view taken along the line A--A in FIG. 31. FIG. 33 shows the conductive plate 8
FIG. 34 is a plan view of FIG. 5 taken along the line A-A in FIG. 33.

Next, FIG. 35 shows the brush holder 17 shown in FIG.
A and 17B show rectangular brush holders 90A and 90B attached to the brush holder attachment part of the terminal base 14, and it is possible to attach brushes or brush holders of various sizes to the terminal base 14. It is shown that.

FIG. 36 shows an electric circuit of an electric drill 1 with a brakeable electric commutator 112.

In FIG. 36, 8 is a commutator, 24.25° 26 and 27 are the fixed terminals provided on the terminal base 14, and 28, 29, 30, 31° 32, 33, 34 and 35 are the terminal base 14. This is a terminal to be inserted. Also, 36°37.38.39.40.41.
42 and 43 are terminals provided on the terminal plate 9, and as mentioned above, the terminal 36 is provided with the terminal base 1.
Terminal 28 is inserted into terminal 37, and terminal 29 is inserted into terminal 37.
The terminal 30 is inserted into the terminal 38, the terminal 31 is inserted into the terminal 39, the terminal 32 is inserted into the terminal 40, the terminal 33 is inserted into the terminal 41, the terminal 34 is inserted into the terminal 42, and the terminal 34 is inserted into the terminal 43. Terminals 35 are respectively inserted and connected electrically.

Further, 57L and 57R are brake coils as described above, and 58L and 58R are main coils. 60L, 6
0R is the choke coil, and each terminal hole 61
and 62 and between terminal holes 63 and 64, and the conductive plates 76 and 80 are cut at the cutting windows 65 and 66. Further, as described above, 78 is the joint portion of each terminal of the conductive plates 76 and 77,
Reference numeral 79 denotes a joint between the ends of the conductive plates 77 and 80, and either the joint 78 or the joint 79 is cut when the rotation direction of the commutator motor 2 is set.

Reference numeral 90 denotes a switch of the electric drill 1, and when the commutator motor 2 is to be supplied with a driving current, the contact terminal (a) and the contact terminal (C) are connected by turning on the switch 90. On the other hand, when stopping the rotation of the commutator motor 2,
By turning off the switch 90, the contact terminal (C
) and contact terminal (b) are connected, and the brake coil 57L
and 57R act as a kind of load to apply 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 if the joint portion 78 is cut, Connected to the fixed terminal 24 and connected to the joint 7
9 is disconnected, it is connected to the fixed terminal 26. Note that the unused terminal 24 or 26 and the contact terminal (
A capacitor may be connected between the terminal and C) to prevent radio wave interference. Furthermore, one core wire 93 of the power cable 92 connected to the AC power source is electrically connected to the contact terminal (a) of the switch 90, and the other core wire [194 is electrically connected to the fixed terminal 27 via a relay terminal (not shown) or the like. ing. Further, the contact terminal (b) of the switch 90 is connected to the lead wire 9
It is connected to the fixed terminal 25 via 5.

In the electric circuit configured as described above, the joint portion 78 is cut, and the lead wire 91 is connected to the fixed terminal 2.
When the switch 90 is turned on while the switch 90 is connected to
Contact terminal (C) - Lead wire 91 - Fixed terminal 24 - Choke coil 60L - Brush 13B - Commutator 8 - Rotor winding - Brush 13A - Choke coil 60R - Joint part 79
The main coil 58R, the main coil 58m, the fixed terminal 27, and the loop of the core wire 94 of the power cable 92 are energized, and the commutator electric motor 1f12 is rotated, for example, in the forward direction.

On the other hand, the joint portion 79 has been cut.1. When the switch 90 is turned on with the lead wire 91 connected to the fixed terminal 26, the current from the AC power supply is transferred from the core wire 93 of the power cable 92 to the contact terminal (a) of the switch 90.
) - Contact terminal (C) of switch 90 - Lead wire 91 - Fixed terminal 26 - Choke coil 60R - Brush 13A - Commutator 8 - @ Trochanter winding - Brush 13B - Chijiku coil 6
0L-Joint part 78-Main coil 58R-Main coil 58L-
Since the current is applied through the loop between the fixed terminal 27 and the core wire 92 of the power cable 92, the current direction to the rotor winding is opposite to the loop, and the commutator motor 2 is driven to rotate in the opposite direction.

Next, when the switch 90 is turned off to stop the rotation of the commutator motor 2 which is in the forward rotation state, the switch 90
Since the contact terminal (b) and the contact terminal (C) are connected, the following open/close loop is formed. That is, the contact terminal (C) of the switch 90 - the contact terminal (b) of the switch 90
) - Lead wire 95 - Fixed terminal 25 - Brake coil 57
L - Brake coil 57R - Joint part 79 - Choke coil 60R - Brush 13A - Commutator 8 - Rotor winding - Brush 13B - Choke coil 60L - Fixed terminal 24 - Lead wire 91 - Contact terminal (C) of switch 90 A closed loop is formed, and the brake coils 57L and 57R serve as a load resistance to apply dynamic braking so that the rotation of the electric motor 2 is abruptly stopped. Braking is also applied in the same manner as above when the motor is in a reverse rotation state.

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

As shown in FIG. 37, on the upper end surface of the stator core 5 formed in the same manner as in the first embodiment, a first
A terminal plate 9 similar to that of the embodiment is attached to each of the stator windings 102L and 102R, which will be described later and is divided into two parts, to serve as an insulating frame and to prevent the windings from collapsing. A plug-in terminal is attached as in the first embodiment. Also, as in the first embodiment, a terminal plate 11 having a similar shape is attached to the lower end surface of the stator core 5.

On the other hand, brushes 13A, 13B, etc., which are the same as those in the first embodiment, contact the commutator 8 formed in the same manner as in the first embodiment so as to energize, and energize the rotor windings wound around the rotor. A terminal base 104 with a terminal attached thereto is attached to the terminal plate 9.

Further, the brush 1 is provided on the upper surface of the terminal base 104.
3A, 13B and brushes 13A, 13B
Brush holders 17A and 17B are attached which are electrically connected to brush lead wires 13AL and 13BL connected to the brushes 13A and 13B, and in order to press the respective tip surfaces of the brushes 13A and 13B into contact with the commutator 8, A coiled brush spring 18A made of a thin plate-like spring material.

18B is attached to brush spring holders 19A and 19B, and this brush spring 18A.

The tips 18AF and 188F of the brushes 18B abut against the rear end surfaces of the brushes 13A and 13B, and the brush 1
The fact that the pressing force is applied from behind 3A and 13B is the same as in the first embodiment.

On the other hand, the tips 18AF and 188F of the brush springs 18A and 18B are the brushes 13A.

When the brush 1 is in contact with the side surface of the brush 13B,
It is also the same as the first embodiment that it also has the function of holding the commutators 3A and 13B at a position apart from the commutator 8.

38 is a plan view of the terminal base 104 removed from the terminal plate 9, FIG. 39 is a front view of the terminal base 104, and FIG. 40 is a plan view of the terminal base 104.
4 is a right side view of the vehicle.

As shown in Figures 38 to 40, the terminal base 1
04 is provided with the brush 13A.

13B, and the brush holders 17A, 17B, and the brush springs 18A, 18.
B and the same brush spring 18A.

Brush spring holder 19A supporting 18B.

19B are provided, and fixed terminals 107 and 108 into which terminals of lead wire terminals connected to a switch or the like of the electric drill 1 are inserted are provided. The fixed terminals 107 and 108 have main body parts 10 made of synthetic resin.
4A, and each fixed terminal is formed at the end of a conductive plate, which will be described later, and the intermediate portion of the conductive plate is buried in the main body 104A made of the synthetic resin.

On the other hand, on the lower surface of the terminal base 104, narrow flat terminals 109, 110, 111, and 112 are provided.
Reference numeral 2 is inserted into and electrically contacted with the insertable terminals 36, 39, 40, and 43 provided on the terminal plate 9, respectively, as in the first embodiment. The terminals 109 to 112 are formed at the end portions of a conductive plate, which will be described later, and the middle portion of the conductive plate is embedded in the synthetic resin portion of the main body portion 104A. Additionally, there are four lock pieces 117°, 118, and 119 on the bottom surface of the terminal base 104.
．． 120 is extended, and lock claws 121, 122, 123 are provided at the end portions of each of the lock pieces 117 to 120.
．． 124 is formed. Same lock claws 121-124
As shown in FIG. 37, the lock claws 121 to 124 are latched to the latching portions of the lower terminal plate 9, and the terminal base 104 and the terminal plate 9 are latched to the latching portions of the lower terminal plate 9. is latched in a way that prevents it from coming off. Further, hooks 117a for removing the lock claws 121-124 are provided on the outer lower end surfaces of the lock pieces 117-120.
~120a is formed.

Further, on the upper surface of the terminal base 104, brush holders 17A, 17B and brush springs 18A are provided as described above.
, 18B, brush spring holders 19A, 19B, fixed terminals 107, 108, etc., as well as the noise generated at the contact portion between the commutator 8 and the brushes 13A, 13B, as in the first embodiment. Terminal hole 125.12 to connect choke coil 601.60R for damping
6, 127, and 128 are provided. Further, the terminal holes 125 and 126 and the terminal holes 127 and 128 are usually short-circuited by a conductive plate, which will be described later, and the choke coil 601.60R is connected to the terminal holes 125 and 126 and the terminal hole 127. When connected between 128 and 128, the conductive plates are cut at cutting windows 129 and 130 so that the drive current for the rotor windings flows through choke coil 601.60R. Further, as in the first embodiment, each of the brush holders 17A and 17B is provided with a brush holder terminal 17A7.17BT. moreover,
A plurality of small lead wire guide pieces 131 are formed to hang down from the upper end surface of the terminal base 104 to prevent the lead wires connected to the fixed terminal 108 from protruding from the outer periphery of the terminal base 104, for example. and a plurality of lead wire guide holes 1 through which the lead wires guided by the lead wire guide pieces 131 are inserted.
32 is formed on the outer periphery of the terminal base 104, as in the first embodiment.

Further, a commutator insertion hole 133 is formed in the terminal base 104 in a circular shape through which the commutator 8 is inserted through a required gap.

The terminal plate 9 formed similarly to the first embodiment is attached to the end face of the stator core 5 as described above, and is an insertion type to which the terminal wires of the stator windings 102L and 102R are connected. winding support frames 54L and 54 for holding the stator windings 102L and 102R so that they do not lose their shape;
Similar to the first embodiment, R is provided and the winding support frames 54L and 54R are integrally formed. And one terminal wire 102L of the same stator winding 11102L
A is connected to the terminal 36 of the terminal plate 9, and the other terminal wire 102LB of the same volume 11102L is connected to the terminal 43. Further, one terminal wire 102RA of the stator winding 11102R is connected to the terminal 3 of the terminal plate 9.
9, and the other terminal line 102RB is connected to the terminal 40.

Next, the arrangement of each conductive plate provided on the terminal base 104 will be explained.

FIG. 41 shows that when the terminal base 104 is integrally molded with synthetic resin, the fixed terminals 107 and 1 are attached to the terminal part.
08 and a plan view in which the respective conductive plates on which the terminals 109 to 112 are formed are arranged with a required interval,
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 conductive plate attached to the terminal base 104 is connected to the fixed terminal 107.
is formed on one terminal portion, and the terminal 10 is formed on the other terminal portion.
9, and a conductive plate 1 arranged symmetrically with the conductive plate 141, with the fixed terminal 108 formed at one end and the terminal 111 formed at the other end.
42, one end 143 is formed to be electrically and mechanically coupled to the brush holder 17A, and the opposite end 144 is electrically and mechanically coupled to the brush holder 17B, Further, terminal holes 125 and 126 to which the choke coil 60L is connected are formed in a branch conductive plate 145 branched from the middle, and a conductive plate 146 in which the terminal 112 is formed at the end thereof,
One end 147 is arranged symmetrically with the conductive plate 146.
is formed to be electrically and mechanically coupled to the brush holder 17B, and the opposite end 148 is formed to be electrically and mechanically coupled to the brush holder 17A, and further branched from the middle part. The branch conductive plate 149 has the terminal hole 127 to which the choke coil 60R is connected.
and 128 are formed, and a conductive plate 150 on which the terminal 110 is formed is used at the end thereof.

As shown in FIG. 38, cutting windows 151, 152, 153 and 154 are formed on the upper surface of the terminal base 104 in addition to the cutting windows 129 and 130. The corresponding portions of the conductive plate 146 that are exposed in each are cut at the cut portion 151 in FIG.
A and 152A, also shown as cutting window 153.15
The corresponding portions of the conductive plate 150 exposed in the respective portions 4 are shown as cut portions 153A and 154A.

The electric circuit is configured such that the rotation direction of the commutator motor 2 changes depending on, for example, when the cutting portion 152A and the cutting portion 154A are cut, and when the cutting portion 151A and the cutting portion 153Δ are cut.

Further, a conductive plate 146 with the cutting window 129 exposed
The corresponding portion is shown as a cut portion 129A in FIG. 41, and the conductive plate 15 exposed in the cut window 130
The corresponding part of 0 is shown as 130Δ. Then, when the choke coils 60L and 6OR are connected to the corresponding terminal holes, the cutting portions 129A and 13OA are cut.

Note that FIG. 45 shows the 8I electric plate 146 and the conductive plate 146.
FIG. 46 is a plan view of a conductive plate 150 having the same shape as that of FIG. Also,
FIG. 48 is a plan view of the conductive plate 141 and the conductive plate 142, and FIG. 49 is a front view of the conductive plate 141 and the conductive plate 142.

FIG. 50 shows a state in which brush holders 90A and 90B, which are shorter than brush holders 17A and 17B, are attached to the terminal base 104, and as in the first embodiment,
This shows that brushes of various lengths can be attached to the terminal base 104.

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

In the figure, 107 and 108 are the fixed terminals,
The fixed terminal 107 is connected to the switch 156 by the lead wire 155.
is connected to the contact terminal (b).

In addition, the contact terminal (a) of the switch 156 is connected to the power cable 1
It is connected to one core wire 157A of 57.

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, the terminal 109 of the terminal base 104 is connected to the terminal 36, the terminal 110 is connected to the terminal 39, and the terminal 40 is connected to the terminal 109 of the terminal base 104. 111, and a terminal 112 is inserted and connected to the terminal 43. 125.126 and 127
128 is the terminal hole to which the choke coils 60L and 60R are connected, and 102L and 102R are the stator windings.

In addition, 151A, 152A, 153A and 154A are
For example, when the commutator motor 2 is rotated in the forward direction, both the cutting section 1528 and the cutting section 154A are cut off, while when the commutator motor 2 is rotated in the reverse direction, Both the cutting portion 151A and the cutting portion 153A are cut.

Therefore, with the cutting parts 152A and 154A cut,
When the switch 156 is turned on, the driving current from the AC power source is transferred from the core wire 157A of the power cable 157 to the switch 1.
56-Lead wire 155-Fixed terminal 107-Stator winding 1
02L - Choke coil 60L - Cutting section 151 Δ - Brush 13B - Commutator 8 - Rotor winding - Brush 13A - Cutting section 153A - Choke coil 60R = Stator winding 102
Electricity is applied through the loop of R-fixed terminal 108-core wire 157B, and the commutator motor and machine 2 are rotated.

On the other hand, when the switch 156 is turned on with the cutting portions 151A and 153A disconnected, the direction of the current flowing through the commutator 8 to the stator winding is changed to the cutting portion 152A.
Since the current direction is opposite to that when 154A and 154A are disconnected, the commutator motor 2 rotates in the opposite direction.

(Effects of the Invention) As described above, according to the present invention, the commutator motor can be rotated by simply cutting either the cut portion of the forward conduction path or the cut portion of the reverse conduction path provided on the terminal base. Since the direction is set, when this commutator motor is used in a power tool, etc., it becomes possible to easily and reliably set the rotation direction of the commutator motor corresponding to the type of power tool, etc. This has the effect of reducing the number of man-hours required to assemble tools and improving the productivity of power tools and the like.

[Brief explanation of the drawing]

The drawings relate to embodiments, and FIG. 1 shows a rectified precharge I according to the present invention.
FIG. 2 is a partially cutaway front view of an electric drill incorporating a 21tIA. Moreover, FIGS. 2 to 36 relate to the first embodiment, and FIGS.
7 to 51 are drawings relating to the second embodiment. Figure 2 is an external perspective view of the terminal base connected and fixed to the terminal plate attached to one end face of the stator core, and Figure 3 shows the brush in pressure contact with the commutator. Fig. 4 is an external perspective view showing a state where the brush is held away from the commutator, Fig. 5 is an external perspective view of the terminal base, Fig. 6 is a plan view of the terminal base, Figure 7 is a front view of the terminal base, Figure 8 is a right side view of the terminal base, and Figure 9 is a front view of the terminal base.
The figure is an external perspective view partially showing the state of lead wire wiring in the terminal base, Fig. 10 is an external perspective view of the terminal plate, Fig. 11 is a plan view of the terminal plate, Fig. 12 is a front view of the terminal plate, Figure 13 is a right side view of the terminal plate, and Figure 14 shows the terminal plate with a mounting number attached to one end of the fixed core and the terminal wire of the stator winding connected to the insertable terminal of the terminal plate. Fig. 15 is a perspective view of the external appearance showing the condition.
Fig. 4 is a partially enlarged perspective view, Fig. 16 is a perspective view showing the mutual wiring state of the terminal wire of the main coil and the terminal wire of the brake coil, and Fig. 17 is a plan view showing the arrangement of the conductive plate of the terminal base. 18 is a front view of FIG. 17, FIG. 19 is a right side view of FIG. 18, FIG. 20 is a left side view of FIG. 18, and FIG. 21 is a plan view of conductive plates 76 and 80. Figure 22 is the 21st
23 is a view taken along the line BB in FIG. 21, FIG. 24 is a plan view of the conductive plate 77, FIG. 25 is a view taken along the line AA shown in FIG. 24, Figure 26 is a view taken from arrow B-8 in Figure 24;
27 is a plan view of the conductive plate 82, FIG. 28 is a view taken along the line A-A in FIG. 27, FIG. 29 is a plan view of the conductive plate 83, and FIG.
The figure is an A-A arrow view in Fig. 29, and Fig. 31 is a 2J electric plate 84.
The plan view of FIG. 32 is the A-A arrow view of FIG. 31, and FIG.
The figure is a plan view of the conductive plate 85, and FIG. 34 is A-A in FIG. 33.
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. Moreover, FIG. 37 is an external perspective view of the terminal base of the second embodiment coupled and fixed to the terminal plate attached to one end face of the stator core, and FIG. 38 is a plan view of the terminal base.
Fig. 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 S electric board of the terminal base, Fig. 42 is a front view of Fig. 41, 43 is a right side view of FIG. 42, FIG. 44 is a left side view of FIG. 42, and FIG. 45 is a view of the conductive plates 146 and 150.
46 is a front view of FIG. 45, FIG. 47 is a right side view of FIG. 48, and FIG. 48 is a plan view of conductive plates 141 and 142.
49 is a front view of FIG. 48, 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. 1... Electric drill 2... Commutator motor 3... Housing 5... Stator core 8... Commutator 9... Terminal plate 10R, 101, 102L, 102R... Stator Windings 13A, 13B...Brush 14.104...Terminal base 17A, 17B...Brush holder 18A, 18B...Brush spring 24.25.
26, 27.107.108...Fixed terminal 29.30
,31,32,33,34,35,109,110,1
11, 112... Inserted terminals 36, 37.38.39.40.41.42.43...
・Insertion type terminal 44.45.46, 47.117.118
．． 119.120...Lock piece 48.49,50,5
1,121,122,123,124...Lock claw 5
3A, 53B, 53C, 53D... Fixed claw 571
, 57R...Brake coil 581, 58R...Main coil 57LA, 571B, 57RA, 57RB...
Brake coil terminal wires 58LA, 58LB, 58
RA, 58RB... Main coil terminal wires 67, 131
... Lead wire guide piece 68.132 ... Lead wire guide hole 73 ... Small protrusion 78.79 ... Joint part 76.77.80, 82, 83, 84, 85, 141,
142, 146, 150...conductive plates 151A, 15
2A, 153A, 154A... Cutting section applicant
Makita Electric Manufacturing Co., Ltd. Representative Patent Attorney Hidehiko Okada (2 others) Fig. 2 Fig. 5 Fig. 10 Fig. 8 Fig. 11 Fig. 13 f512 Fig. 14 Fig. 57LA Fig. 15 Fig. 16 Fig. 17 Figure 28Figure 30Figure 31Figure 32Figure 33Figure 34Figure 35Figure 37Figure 40Figure 41Figure 42Figure 45Figure 47Figure 46Figure 43Figure 44Figure 48 Figure 49 Figure 50

Claims (1)

[Scope of Claims] Each terminal wire of the stator winding is connected to one end face of a stator in which a required stator winding is wound around each of the magnetic poles, and an external terminal to be inserted is connected to one end face of the stator. A terminal plate provided with insertable terminals for inserting and connecting the terminals is attached and fixed, while the terminal plate is provided with the insertable terminals and contacts the commutator to supply the required current to the rotor windings. A commutator in which required electrical connections are made by directly coupling a terminal base, which is provided with a brush assembly section for the purpose of the operation, and a fixed terminal, etc. for connecting lead wires from a power switch, etc., to the terminal plate. In the electric motor, a forward conduction path and a reverse conduction path for current flowing through the rotor winding via the commutator are formed in advance on the terminal base, and a conduction path for the current flowing through the rotor winding is formed in advance. A commutator motor characterized in that each of the forward conductive path and the reverse conductive path is provided with a cutting portion for cutting off energization of the forward conductive path or the reverse conductive path in accordance with the rotation direction.