JPH0327756A - Motor - Google Patents

Abstract

PURPOSE:To thin a motor and to simplify the wiring from a wiring board to an electric circuit by providing a printed wiring part to apply currents to stator winding at the end face in the axial direction of a laminated core. CONSTITUTION:A printed wiring part 21 is provided at the end face in the axial directions of a laminated core 3 being arranged opposite to the inside periphery 1a of a rotor magnet 1. For this printed wiring part 21, printed wiring is applied directly to the end face 3b of the laminated core 3b by etching treatment. And the end part of stator widing 4, which is wound in a groove 3d for winding provided at the periphery of the laminated core 3, is connected to the printed wiring part 21. Moreover, the terminal 15 to mount the laminated core 3 to a housing 8 is provided in a body with the laminated core 3, and a connection 16 to be connected to a motor driving circuit not shown in the figure is provided at one part of it so that the power sent from the motor driving circuit may flow to the stator winding 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a motor used in video and audio equipment such as video tape recorders, audio cassette tape recorders, and video disc players. BACKGROUND OF THE INVENTION In recent years, motors have been increasingly used in video and audio equipment for the purpose of increasing performance and multifunctionality. 14th
The figure shows a cross-sectional view of a conventional motor. In FIG. 14, a rotor magnet magnetized into a plurality of poles is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. Further, on the inner circumferential side of the rotor magnet 1, there is a laminated core 3 formed by laminating a plurality of thin plates of magnetic material such as silicon steel plates so that the outer circumferential surface faces the inner circumferential surface 1a of the rotor magnet 1. A protrusion #@3 is provided on the outer periphery of the laminated core 3.
A and a winding groove (not shown) for winding the stator winding 4 concentrically with the rotor magnet 1 are provided inside it. A motor shaft 5 is press-fitted into a boss portion 2a provided at the center of the back yoke 2, and the motor shaft 5, rotor magnet l, and back yoke 2 form a motor rotor 6. Further, the motor shaft 5 is rotatably supported by a sliding bearing 9 made of oil-impregnated alloy or the like provided in a housing 8 to which the laminated core 3 is fixed with screws 7. Further, a printed wiring board l1 for energizing the stator winding 4 is fixed to the housing 8 together with the laminated core 3 by screws 7 at a position facing the laminated core 3 at a predetermined distance. A plurality of rotational position detection elements 10 made of Hall ICs for detecting the position of the rotor magnet 1 are attached to the substrate 11. Here, the laminated core 3 is fixed to the housing 8 with screws 7 with the printed wiring board l1 in between. Therefore, printed wiring board Fi. ll includes an end of the stator winding 4 (not shown) for energizing the stator winding @ 4, and an end portion of the stator winding 4 for giving position information of the rotor magnet 1 to the motor drive control circuit (not shown). The terminals (not shown) of the rotor position detection element lO are connected. Here, the rotor position detection element 10 detects the rotational position of the rotor magnet 1 by detecting the magnetic poles of the rotor magnet 1, and switches the current to each phase of the stator winding 4 according to this output signal. When the stator winding 4 is energized, the rotor 6 starts rotating due to the magnetic force generated in the stator winding 4. Problems to be Solved by the Invention However, the motor configured as described above has the following problems.

(1) Since the laminated core and the printed wiring board face each other with a gap between them, the height of the motor becomes large.

(2) Since the laminated core and the printed wiring board face each other with a gap between them, it is difficult to wire the ends of the stator windings to the wiring board. (3) Since the laminated core and the printed wiring board are constructed separately, it is difficult to position the rotor position detection element with respect to the laminated core. As a result, the position of the rotor position detection element shifts, and the motor's control characteristics deteriorate. (4) Since the rotor position detection element is provided on the I1i substrate and is configured to detect the leakage magnetic field in the direction of the end face of the rotor magnet to detect the rotor position, the rotor position detection element Therefore, it is necessary to use a highly sensitive device, which reduces the range of rotor position detection devices that can be selected and increases the cost. (5) When using a light-reflecting rotational speed detector, the motor structure must be such that it is not affected by external light.

(6) Wiring is complicated and the assembly process takes time. (7)
The motor current causes the built-in transistor in the motor drive control circuit to generate heat, and as a result, the drive transistor loses its thermal margin and is destroyed. The present invention solves the above-mentioned problems by realizing a thin design, simplifying the wiring from the wiring board to electric circuits such as stator windings and drive circuits, and making it possible to accurately position the rotor position detection element. It is an object of the present invention to provide a motor that improves the control characteristics of the motor, has high reliability, and does not have an increased outer diameter.

Means for Solving the Problems In order to solve the above problems, the motor of the present invention includes a motor shaft, a fixed magnetized rotor that is fixed to the motor shaft and rotates integrally, and a rotor that is opposed to the rotor. A laminated core in which a plurality of annular magnetic plates arranged and having salient poles and winding grooves are laminated, and a stator winding that is wound around the winding groove and applies rotational force to the rotor when energized. A stator is provided, and a printed wiring portion is formed on the axially facing end surface of the laminated core.

Further, in the present invention, a rotor position detection element for detecting the rotational position of the rotor is mounted on a printed wiring portion formed on the axial end face of the laminated core.

Furthermore, in the present invention, a rotational speed detection element for detecting the rotational speed of the rotor is mounted on the printed wiring portion formed on the axial end face of the laminated core. Further, in the present invention, part or all of the drive circuit for driving and controlling the rotation of the rotor is mounted on the printed wiring portion formed on the axial end face of the laminated core. Effect: With the above configuration, a printed wiring portion for supplying current to the stator windings is provided on the axial end face of the laminated core, thereby providing a thin motor with easy wiring.

Furthermore, by mounting the rotor position detection element on the printed wiring section provided on the axial end face of the laminated core, the rotor position detection element can be accurately positioned with respect to the stator, resulting in good control characteristics. At the same time, an inexpensive motor can be obtained. Furthermore, by providing a rotational speed detection element on the printed wiring section provided on the axial end face of the laminated core, a motor that can detect the rotational speed of the motor without increasing the outer diameter can be obtained. Furthermore, by mounting part or all of the drive circuit for driving and controlling the rotation of the motor on the printed wiring section provided on the axial end surface of the laminated core, wiring is simple and the stator (motor) This reduces the amount of wiring (east line) from the motor, which is advantageous in terms of cost.Moreover, since the stator serves as a heat sink, the heat generated by the drive transistor is reduced, resulting in a motor that prevents the drive transistor from being destroyed. EXAMPLE Hereinafter, a motor according to an example of the present invention will be explained based on the drawings. FIG. 1 is a cross-sectional view of a motor according to a first embodiment of the present invention, and FIG. 2 is a view of the laminated core portion of the same motor in the Y direction. In FIG. 1, a rotor magnet 1 magnetized into multiple poles in the circumferential direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. A laminated core 3 made by laminating a plurality of thin plates of magnetic material such as silicon steel plates is arranged on the inner circumferential side of the rotor magnet 1 so that the outer circumferential surface faces the inner circumferential surface 1a of the rotor magnet. It has been done. As shown in FIG. 2, a printed wiring section 21 for energizing the stator winding 4 is provided on the axial end surface 3b of the laminated core 3. The wiring is printed on the end face 3b by direct etching or the like.

In addition, as shown in FIG. 2, the outer peripheral part of the laminated core 3 has
A salient pole 3a and a plurality of winding grooves 3d for winding the stator winding 4 concentrically with the rotor magnet l are provided inside the salient pole 3a. Child volume, s! 4 is wound a predetermined number of times, and the end portion 4a of the stator winding 4
is connected to the printed wiring section 2l by a method such as soldering. A terminal 15 for attaching the laminated core 3 including the printed wiring section 21 to the housing 8 is provided integrally with the laminated core 3, and a part thereof has a terminal for connecting to a motor drive control circuit (not shown). A connection part l6 is provided. As a result, the power sent from the motor drive control circuit can flow to the stator winding 4. In this way, the stator 17 is formed by the laminated core 3, the stator winding 4, the printed wiring section 21, and the terminal 15. A motor shaft 5 is press-fitted into a boss portion 2a provided at the center of the back yoke 2, and the motor shaft 5, rotor magnet 1, and back yoke 2 form a motor rotor 6. The motor shaft 5 is rotatably supported by a flat bearing 9 made of oil-impregnated alloy or the like, which is provided in a housing 8 to which the laminated core 3 is fixed with screws 7. Further, the housing 8 includes a rotor position detection element 20 consisting of a Hall IC or the like for detecting the position of the rotor magnet l.
A rotor position detection element holding portion l9 is provided for attaching the rotor position detection element 20, and the terminals of the rotor position detection element 20 are connected to the motor drive control circuit. Here, the rotor magnet 1 is detected by the rotor position detection element 20.
The rotational position of the stator winding 4 is detected, and the motor drive control circuit switches the current to each phase of the stator winding 4 according to the output signal. As a result, the magnetic force generated in the stator winding 4 causes the rotor 6 to starts rotating. By forming the printed wiring portion on the axial end face of the laminated core as described above, the following effects occur. (1) Compared to conventional models, the motor can be made thinner because the wiring for supplying current to the stator windings can be formed directly on the axial end face of the laminated core made of thin magnetic material. (2) As in the conventional example, the stator including the laminated core and the wiring board must be at a specified distance (at least the distance must be sufficient to prevent the rotor and the rotor position detection element provided on the printed wiring board from coming into contact with each other). Since there is no need to separate them to face each other, it is possible to make them thinner. In addition, it is easy to connect the ends of the stator windings to the wiring board by soldering. In this way, according to this embodiment, it is possible to make the device thinner and to simplify the wiring, although it has a very simple structure. In this example, an iron printed circuit board method is used in which the printed wiring part is directly formed on a thin board made of magnetic material, but the printed wiring part is not limited to this example, and can be made of paper phenol or glass. The printed wiring portion may be formed by printing wiring on a substrate made of epoxy or the like or a flexible resin made of polyimide or the like, and the printed wiring portion may be adhered to the axial end face of the laminated core to form the substrate.

Next, other embodiments of the present invention will be described.

Figure 3 is a cross-sectional view of the motor in the second embodiment;
The figure is a Y-direction arrow view of the laminated core of the same motor. In Figure 3, a rotor magnet 1 magnetized into multiple poles in the circumferential direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. ing. A laminated core 3 made by laminating a plurality of thin plates of magnetic material such as silicon steel plates is disposed on the inner circumferential side of the rotor magnet 1 so that the outer circumferential surface faces the inner circumferential surface 1a of the rotor magnet l. has been done. Also, as shown in Figure 4,
The printed wiring section 21 includes wiring for energizing the stator windings I and I4 and a Hall IC for detecting the position of the rotor magnet 1.
Wiring for mounting the rotor position detecting element 30 consisting of the above is formed on the axial end surface 3b of the laminated core 3 by direct etching or the like. Further, on the outer periphery of the laminated core 3, a salient pole 3a and a plurality of winding grooves 3d for winding the stator winding [4] concentrically with the rotor magnet 1 are provided inside the salient pole 3a. , the stator winding 4 is placed in the winding groove 3d.
is wound a predetermined number of times, and the end portion 4a of the stator winding 14 is connected to the printed wiring portion 21 by a method such as soldering. Further, the terminal l5 is provided integrally with the laminated core 3 including the printed wiring section 21 in order to attach it to the housing 8, and a part of the terminal l5 is provided with a motor drive control circuit (not shown). A connection part l6 is provided for connection. As a result, the detection signal of the rotor position detection element 30 can be sent to the motor drive control circuit via the connection part 16, and the electric power sent from the motor drive control circuit can be sent to the stator via the connection part 16. It can be passed through winding 4. In this way, the stator 17 is formed by the laminated core 3, the stator winding 4, the printed wiring section 21, and the terminal 15. A motor shaft 5 is press-fitted into a boss portion 2a provided at the center of the back yoke 2, and the motor shaft 5, rotor magnet 1, and back yoke 2 form a motor rotor 6. The motor shaft 5 also has a sliding bearing 9 made of an oil-impregnated alloy provided in a housing 8 to which the laminated core 3 is fixed with screws 7.
It is rotatably supported by Further, the rotor position detection element 30 is connected to the salient poles 3 of the laminated core 3.
It is provided on the axial end surface corresponding to b or on the outer peripheral surface of the laminated core 3 (in this case, it is embedded in the end of the laminated core, and the surface of the rotor position detection element is located inside the surface of the laminated core). , the terminal 30a of the rotor position detection element 30 is connected to the printed wiring section 21. Here, the rotational position of the rotor magnet 1 is detected by the output of the rotor position detection element 30, and according to this output signal, the motor drive control circuit switches and energizes each phase of the stator winding 4. As a result, the rotor 6 starts rotating due to the magnetic force generated in the stator winding 4. By forming the printed wiring section on the axial end face of the laminated core as described above and mounting the rotor position detection element on the printed wiring section, the following effects occur. (1) Compared to the conventional example, the motor can be made thinner because wiring for supplying current to the stator windings can be formed directly on the axial end face of the laminated core made of thin magnetic material. (2) As in the conventional example, the stator including the laminated core and the wiring board must be at a specified distance (at least, the distance must be sufficient to prevent the rotor and the rotor position detection element provided on the printed wiring board from coming into contact with each other) Since there is no need to make them face each other by H, it is possible to make them thinner. Further, the end portion of the stator winding can be easily connected to the wiring board by soldering or the like.

(3) By providing a printed wiring section on the axial end face of the laminated core and mounting the rotor position detection element on the printed wiring/wiring section, the rotor position detection element can be easily adjusted relative to the stator winding (stator). Control characteristics are improved because positioning can be performed accurately. (4) Since the rotor position detection element is placed on the inner peripheral surface of the magnetic pole of the rotor magnet, the element is used in a strong magnetic field, making it possible to use a relatively low-sensitivity and inexpensive element. can. (5) By installing the rotor position detection element on the laminated core, more of the magnetic flux generated by the rotor can pass through the rotor position detection element, so a relatively low-sensitivity and inexpensive element can be used. can do. (6) Since there is no need to generate a leakage magnetic field on the axial end face of the rotor magnet, magnetic shielding from the outside of the motor is easy. As described above, according to this embodiment, although it has a very simple configuration, it can be made thinner, the wiring is simple, and the positioning of the rotor position detection element can be performed accurately, so the control characteristics are good and the cost is low. It can be configured as follows. Note that this example uses an iron printed circuit board method in which the wiring part is directly formed on a thin board made of magnetic material, but the printed wiring part is not limited to this example, and can be made of paper phenol or glass epoxy. Alternatively, the printed wiring portion may be formed on a substrate made of a material such as the like, or a flexible resin made of a polyimide or the like, and the printed wiring portion may be bonded to the end surface of the laminated core to form a substrate.

Furthermore, in this embodiment, the wiring section for energizing the stator windings and the wiring section for the rotor position detection element that detects the position of the rotor are provided on the same plane. Each may be configured on separate surfaces.

Furthermore, in this embodiment, the rotor position detection element is mounted on the axial end face corresponding to the salient pole 3b of the laminated core 3 or on the outer peripheral surface of the laminated core 3. If there is another salient pole on which the stator winding is not wound in the winding groove for winding the stator winding, the shape of A rotating position detection element may also be provided. Next, still another embodiment of the present invention will be described. 5 is a cross-sectional view of the motor in the third embodiment, FIG. 6 is a view of the laminated core of the motor in the Y1 direction, FIG. 7 is a view of the back yoke of the motor in the Y1 direction, and FIG. The figure is a view of the laminated core of the same motor in the Y2 direction. In FIG. 5, a rotor magnet 1 magnetized into a plurality of poles in the circumferential direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. A laminated core 3 formed by laminating a plurality of thin plates of magnetic material such as silicon steel plates is disposed on the inner circumferential side of the rotor magnet 1 so that the outer circumferential surface faces the inner circumferential surface 1a of the rotor magnet 1. It has been done. As shown in FIG. 6, the printed wiring section 2lb includes wiring for energizing the stator winding 4, and
The wiring for mounting the rotor position detection element 40 consisting of a Hall IC or the like for detecting the position of the rotor magnet 1 is directly formed on the axial end surface 3 of the laminated core 3 by etching or other processing.
It is formed in b. Further, as shown in FIG. 7, on the inner lower surface 2b of the back yoke 2, a reflective plate 22 in which reflective surfaces and non-reflective surfaces are alternately formed at equal pitches in the circumferential direction is pasted with adhesive or the like. ．． Furthermore, printed wiring section 2
1c as shown in FIG. A rotational speed detection element 4 consisting of a light emitting element and a light receiving element is located at a position facing the reflection plate 22.
Wiring for mounting 1 is directly formed on the axial end surface 3c of the laminated core 3 by etching or other processing. Further, the outer circumferential portion of the laminated core 3 is provided with salient poles 3a and a plurality of winding grooves 3d for winding the stator winding 4 on the rotor magnet 1 and the center circle on the inner side thereof. The winding groove 3
d, the stator winding 4 is wound a predetermined number of times.
Further, the terminal l5 is provided integrally with the laminated core 3, which includes the printed wiring portions 2lb and 21c, in order to attach the laminated core 3 to the housing 8. Drive control circuit (
1! A connection part l6 is provided for connection to the main body (not shown). As a result, the rotor position detection element 40 and rotation speed detection element 4l are connected to the motor drive control circuit through the connection part l6.
A detection signal can be sent. In addition, electric power sent from the motor drive control circuit can be passed to the stator winding 4 via the connection portion 16. In this way, the laminated core 3, stator winding 4, printed wiring parts 2lb, 21c, and terminal 15
stator l7 is formed. Further, a motor shaft 5 is pressed into a boss portion 2a provided at the center of the pack yoke 2, and a motor rotor 6 is formed by the motor shaft 5, rotor magnet 1, and back yoke 2. . The motor shaft 5 also has a sliding bearing 9 made of an oil-impregnated alloy provided in a housing 8 to which the laminated core 3 is fixed with screws 7.
It is rotatably supported by Here, the rotational position of the rotor magnet l is detected by the output of the rotor position detection element 40, and according to this output signal, the motor drive control circuit switches and energizes each phase of the stator winding 4, As a result, the rotor 6 starts rotating due to the magnetic force generated in the stator winding 4.

Further, as the rotor 6 rotates, the reflection plate 22, which is provided integrally with the rotor 6, also starts rotating. then. The light emitted from the light emitting part of the rotational speed detection element 4l is irradiated onto the reflecting plate 22, and when the light is irradiated on the reflective surface of the reflecting plate 22, it is reflected, and when the light is incident on the light receiving part, A voltage is generated at the terminal of the rotational speed detection element 41. On the other hand, when the emitted light is irradiated onto a non-reflective surface, no voltage is generated at the terminal of the rotational speed detection element 4l because the reflected light does not enter the light receiving section. Therefore, the rotational speed of the rotor 6 is detected by counting the number of times the voltage is generated by a counter inside the motor drive control circuit. Based on the detected rotational speed, the motor drive control circuit changes the frequency of energizing the stator winding 4 so that the rotational speed of the rotor 6 is constant or reaches a desired rotational speed. Control the rotation speed of.
By providing a printed wiring section on the axial end face of the laminated core as described above, and mounting a rotor position detection element and a motor rotation speed detection element on the printed wiring section, the following effects occur. (1) Compared to the conventional example, the motor can be made thinner because the wiring for supplying current to the stator windings can be formed directly on the axial end face of the laminated core made of thin magnetic material.

(2) As in the conventional example, the stator including the laminated core and the wiring board must be separated by a predetermined distance M (at least a distance that is sufficient to prevent the rotor and the rotor position detection element provided on the printed wiring section from coming into contact with each other). ) Since there is no need to separate them and face them, it is possible to make them thinner. Additionally, it is easy to connect the ends of the stator windings to the wiring board by soldering. (3) By providing a printed wiring section on the axial end face of the laminated core and mounting the rotor position detection element on the printed wiring section, the rotor position detection element can be positioned with respect to the stator winding (stator). Since it can be performed accurately, control characteristics are improved. (4) Since the rotor position detection element is placed on the inner peripheral surface of the magnetic pole of the rotor magnet, the element is used in a strong magnetic field, making it possible to use a relatively low-sensitivity and inexpensive element. can. (5) By installing the rotor position detection element on the laminated core, more of the magnetic flux generated by the rotor can pass through the rotor position detection element, so a relatively low-sensitivity and inexpensive element can be used. can do.

(6) Since there is no need to generate a leakage magnetic field on the axial end face of the rotor magnet, magnetic shielding from the outside of the motor is easy. (7) Since it is no longer affected by external light, accurate rotation speed can be determined even if an optical rotation speed detection means is used. (8) A rotation speed detection means for detecting the rotation speed of the motor can be provided without increasing the outer diameter of the motor.

As described above, according to this embodiment, although it has a very simple configuration, it can be made thin, wiring is simple, and the control characteristics are good because the rotor position detection element can be accurately positioned. It is possible to provide a rotation speed detection means for detecting the rotation speed of the motor without increasing the outer diameter of the motor at all, and it can be constructed at low cost.

In addition, in this example, an iron printed circuit board method is adopted in which the wiring part is directly formed on a thin board made of magnetic material, but the printed wiring part is not limited to this example, and can be made of paper phenol or glass. A printed wiring part is formed on a substrate made of epoxy etc. or a flexible resin made of polyimide etc.
It may also be bonded to the end face of the laminated core to form a substrate. Furthermore, in this embodiment, the wiring section for energizing the stator windings and the wiring section for the rotor position detection element that detects the rotor position are arranged on the same plane. Each may be placed on a different surface. In addition, in this embodiment, an optical type was used as the motor rotation speed detection device, but an FG magnet made of a resin magnet or the like magnetized with a predetermined number of poles may be fixed to the outer periphery of the rotor by adhesive. , a single-point detection type (
The rotational speed of the rotor is detected by the zigzag pattern (magnetic pulse method) or the zigzag pattern created on the printed wiring board, and the zigzag pattern generates electricity due to changes in the magnetic field caused by magnets magnetized to predetermined poles provided on the rotor. The rotation speed of the motor may be detected using a rotation speed detection device such as an integral type (pattern method), and is not limited to this embodiment.

In this embodiment, the printed wiring section and the rotational speed detection device are provided on separate end faces of the laminated core, but if there is a dimensional allowance, they may be provided on the same end face. Further, in this embodiment, the rotor position detection element is mounted on the axial end face corresponding to the salient pole 3b of the laminated core 3 or on the outer peripheral surface of the laminated core 3. If there is another salient pole in which the stator winding is not wound in the winding groove for winding the stator winding, there is a rotating groove on the axial end face or outer peripheral surface of that other salient pole. A child position detection element may also be provided.

Next, still another embodiment of the present invention will be described. FIG. 9 is a cross-sectional view of the motor in the fourth embodiment;
Figure 0 is a view of the laminated core of the same motor in the Y1 direction, Figure 11 is a view of the laminated core of the same motor in the Y2 direction, Figure 12 is a configuration diagram of the drive control circuit of the motor, and Figure 13 is the same. It is a current waveform diagram when driving a motor.

In FIG. 9, a rotor magnet 1 magnetized into a plurality of poles in the circumferential direction is fixed to a back yoke 2 made of a magnetic material by adhesive or the like. A laminated core 3 made by laminating a plurality of thin plates of magnetic material such as silicon steel plates is disposed on the inner circumferential side of the rotor magnet 1 so that the outer circumferential surface faces the inner circumferential surface la of the rotor magnet 1. has been done. The printed wiring section 2lb is the 10th
As shown in the figure, the wiring for energizing the stator winding 4 and the wiring for mounting the rotor position detection element 50 consisting of a Hall IC or the like for detecting the position of the rotor magnet 1 are etched, etc. It is directly formed on the axial end surface 3b of the laminated core 3 by the process. Further, on the inner lower surface 2b of the back yoke 2, a reflective plate (not shown) in which reflective surfaces and non-reflective surfaces similar to those shown in FIG. 7 are alternately formed at equal pitches in the circumferential direction is pasted with adhesive or the like. ing. Furthermore, as shown in Figure 11. In the printed wiring section 21c, wiring for mounting a rotational speed detection element 5l consisting of a light emitting element and a light receiving element at a position facing the reflection plate is formed directly on the axial end surface 3c of the laminated core 3 by a process such as etching. ing. The terminal of this rotational speed detection element 5l is connected to the printed wiring part 21c, and the electric power for driving the rotational speed detection element 5l and the detection signal outputted by the rotational speed detection element 51 are transmitted through the printed wiring part 21c. , is configured to be transmitted to and received from the motor drive control circuit. Further, on the outer circumference of the laminated core 3, there are salient poles 3a and a plurality of winding grooves 3d for winding the stator winding 4 concentrically with the rotor magnet inside the salient poles 3a (in this embodiment). The stator winding 4 is wound a predetermined number of times in the winding groove 3d.

Here, if the structure of the motor drive control circuit is three-phase half-wave drive as shown in FIG. In order to supply power to each phase, drive transistors 52 of the drive control circuit 12 are provided corresponding to each phase (three in this embodiment). Further, rotor position detection elements 50 are also provided corresponding to each phase (three in this embodiment).

Here, the terminal l5 is provided integrally with the laminated core 3, which includes the printed wiring parts 2lb and 21c, in order to attach the laminated core 3 to the housing 8. A connecting portion l6 is provided for connecting to a motor drive control circuit (not shown). As a result, the detection signal of the rotor position detection element 50 can be sent to the motor drive control circuit via the connection l6, and the power sent from the motor drive control circuit can be sent to the drive transistor 52 via the connection l6. Therefore, the current can be passed through the stator winding 4. In this way, the stator 17 is formed by the laminated core 3, the stator winding 4, the printed wiring parts 2lb and 21c, and the terminal 15. Further, a motor shaft 5 is press-fitted into a boss portion 2a provided at the center of the back yoke 2, and the motor shaft 5, rotor magnet 1, and back yoke 2 form a motor rotor 6. Further, the motor shaft 5 is rotatably supported by a sliding bearing 9 made of an oil-impregnated alloy provided in a housing 8 to which the laminated core 3 is fixed with screws 7. Here, the rotational position of the rotor magnet 1 is detected by the output of the rotor position detection element 50, and according to this output signal, the motor drive control circuit controls each phase of the stator winding 4 as shown in FIG. As a result, the rotor 6 starts rotating due to the magnetic force generated in the stator winding 4. Further, as the rotor 6 rotates, the reflection plate provided integrally with the rotor 6 also starts rotating. At that time, the light emitted from the light emitting part of the rotational speed detection element 5l is irradiated onto the reflecting plate, and when the light is irradiated onto the reflective surface of the reflecting plate, it is reflected and the light is incident on the light receiving part. As a result, a voltage is generated at the terminal of the rotational speed detection element 51. On the other hand, when the emitted light is irradiated onto a non-reflective surface. Since no reflected light enters the light receiving section, no voltage is generated at the terminals of the rotational speed detection element 51. Therefore, the rotational speed of the rotor 6 is detected by counting the number of times the voltage is generated by a counter inside the motor drive control circuit. Based on the detected rotational speed, the motor drive control circuit changes the frequency at which the stator winding 4 is energized so that the rotational speed of the rotor 6 is constant or reaches a desired rotational speed. Controls the rotation speed of the motor.

As described above, a printed wiring section is provided on the axial end face of the laminated core, and a rotor position detection element, a motor rotation speed detection means, and a drive transistor for driving the motor are mounted on the printed wiring section. As a result, the following effects occur. (1) Compared to conventional models, the motor can be made thinner because wiring for supplying current to the stator windings can be formed directly on the axial end face of the laminated core made of thin magnetic material. (2) As in the conventional example, the stator including the laminated core and the wiring board must be kept at a predetermined distance (R is low, and the distance must be sufficient to prevent the rotor and the rotor position detection element provided on the printed wiring section from coming into contact with each other) ) Since there is no need to separate them and face them, it is possible to make them thinner. In addition, it is easy to connect the ends of the stator windings to the wiring board by soldering, etc. (3) By providing a printed wiring section on the axial end face of the laminated core and mounting the rotor position detection element on the printed wiring section, the rotor position detection element can be positioned with respect to the stator winding (stator). Since it can be performed accurately, control characteristics are improved. (4) Since the rotor position detection element is placed on the inner peripheral surface of the magnetic pole of the rotor magnet, the element is used in a strong magnetic field, making it possible to use a relatively low-sensitivity and inexpensive element. can. (5) By installing the rotor position detection element on the laminated core, more of the magnetic flux generated by the rotor can pass through the rotor position detection element, so a relatively low-sensitivity and inexpensive element can be used. can do. (6) Since it is not necessary to generate a leakage magnetic field on the axial end face of the rotor magnet, magnetic shielding from the outside of the motor is easy.

(7) Since it is no longer affected by external light, it is possible to accurately determine the rotational speed even if an optical rotational speed detection means is used. (8) A rotation speed detection means can be provided to detect the rotation speed of the motor without increasing the outer diameter of the motor. (9) By mounting the drive transistor that drives the motor on the axial end face of the laminated core, wiring becomes simpler and the amount of wiring (east wire) from the laminated core (motor) is reduced, resulting in cost advantages. .

(10) Since the laminated core acts as a heat sink for the heat generated by the drive transistor, the temperature rise of the drive transistor is reduced and thermal destruction of the drive transistor can be prevented. For this purpose, a drive transistor with a small thermal margin, that is, an inexpensive drive transistor can be used. Alternatively, a motor with higher output can be obtained using the same drive transistor. As described above, according to this embodiment, although it has a very simple configuration, it can be made thin, wiring is simple, and the control characteristics are good because the rotor position detection element can be accurately positioned. without increasing the outer diameter of the motor.
A rotation speed detection means for detecting the rotation speed of the motor can be provided, thermal destruction of the drive transistor can be prevented, and the structure can be constructed at low cost. In this example, an iron printed circuit board method is used in which the wiring part is directly formed on a thin board made of magnetic material, but the printed wiring part is not limited to this example, and can be made of paper phenol or glass epoxy. Alternatively, a printed wiring section may be formed on a flexible resin such as polyimide or the like, and then adhered to the end surface of the laminated core to form a substrate.
Furthermore, in this embodiment, the wiring section for supplying current to the stator windings and the wiring section for the rotor position detection element that detects the position of the rotor are provided on the same plane. , each may be configured on a separate surface. In addition, in this embodiment, an optical type was used as the motor rotation speed detection device, but an FG magnet made of a resin magnet or the like magnetized with a predetermined number of poles may be fixed to the outer periphery of the rotor by adhesive. , a single-point detection type (
The rotational speed of the rotor is detected by the zigzag pattern (magnetic pulse method) or the zigzag pattern created on the printed wiring board, and the zigzag pattern generates electricity due to changes in the magnetic field caused by magnets magnetized to predetermined poles provided on the rotor. The rotation speed of the motor may be detected using a rotation speed detection device such as an integral type (pattern method), and is not limited to this embodiment.

In this embodiment, the printed wiring section and the rotational speed detection device are provided on separate end faces of the laminated core, but they may be provided on the same end face if there is a dimensional allowance. Furthermore, in this embodiment, the rotor position detection element is mounted on the axial end face corresponding to the salient pole 3a of the laminated core 3 or on the outer peripheral surface of the laminated core 3. If there is another salient pole in which the stator winding is not wound in the winding groove for winding the stator winding, there is a rotating groove on the axial end surface or outer peripheral surface of the other salient pole. A child position detection element may also be provided. In addition, although the motor drive system in this embodiment is a three-phase half-wave system, it may also be a three-phase full-wave system. In the case of a three-phase full-wave system, the stator windings wound around each phase Packaged with two drive transistors to power the
It can be mounted on the printed wiring section. Effects of the Invention As described above, according to the present invention, there is provided a motor shaft, a fixed magnetized rotor fixed to the motor shaft and rotating integrally, and salient poles and windings arranged opposite to the rotor. A stator comprising a laminated core in which a plurality of annular magnetic plates having wire grooves are laminated, and a stator winding that is wound around the winding groove and applies rotational force to the rotor when energized. death,
By forming the printed wiring portion on the axial end face of the laminated core, it is possible to provide a motor that is extremely simple in structure, thin, and easy to connect. Furthermore, by mounting a rotor position detection element for detecting the rotational position of the rotor on the printed wiring section formed on the axial end face of the laminated core, the rotor position detection element is installed with a very simple structure. Since positioning can be performed accurately using the elements, it is possible to provide a motor with good control characteristics and at low cost.

Furthermore, by mounting a rotation speed detection element that detects the rotation speed of the rotor on the printed wiring section formed on the axial end surface of the laminated core, the outer diameter of the motor can be increased even though it has a very simple configuration. It is possible to provide a motor that can detect the rotational speed of the motor without having to do so.

Furthermore, by mounting part or all of the drive circuit for driving and controlling the rotation of the rotor on the printed wiring section formed on the axial end surface of the laminated core, the wiring from the laminated core (motor) line), which is advantageous in terms of cost.
Furthermore, since the stator serves as a heat sink, the heat generated by the drive transistor is reduced, making it possible to provide a motor that prevents thermal destruction of the drive transistor.

[Brief explanation of drawings]

Claims (1)

[Claims] 1. A motor shaft, a fixed magnetized rotor that is fixed to the motor shaft and rotates integrally with the motor shaft, and a ring-shaped rotor that is arranged opposite to the rotor and has salient poles and a winding groove. A stator comprising a laminated core in which a plurality of magnetic plates are laminated, and a stator winding wound in the winding groove to apply a rotational force to the rotor when energized. A motor with printed wiring formed on the axial end face. 2. A motor shaft, a fixed magnetized rotor that is fixed to the motor shaft and rotates integrally, and a plurality of annular magnetic plates that are arranged opposite to the rotor and have salient poles and winding grooves. and a stator comprising a stator winding that is wound in the winding groove and applies rotational force to the rotor when energized, and printed on the axial end surface of the laminated core. A motor comprising a wiring part formed therein and a rotor position detection element for detecting the rotational position of the rotor mounted on the printed wiring part. 3. A motor shaft, a fixed magnetized rotor that is fixed to the motor shaft and rotates integrally, and a plurality of annular magnetic plates that are arranged opposite to the rotor and have salient poles and winding grooves. and a stator comprising a stator winding that is wound in the winding groove and applies rotational force to the rotor when energized, and printed on the axial end surface of the laminated core. A motor comprising a wiring section formed therein and a rotation speed detection element for detecting the rotation speed of the rotor mounted on the printed wiring section. 4. A motor shaft, a fixed magnetized rotor that is fixed to the motor shaft and rotates integrally, and a plurality of annular magnetic plates that are arranged opposite to the rotor and have salient poles and winding grooves. and a stator comprising a stator winding that is wound in the winding groove and applies rotational force to the rotor when energized, and printed on the axial end surface of the laminated core. A motor in which a wiring part is formed and part or all of a drive circuit for driving and controlling the rotation of the rotor is mounted on the printed wiring part.