JPS59169357A - Motor - Google Patents

Abstract

PURPOSE:To enhance the dimensional accuracy and to improve the assembling property by forming double cylinder in which a coil is annularly disposed concentrically with a rotor and yokes are disposed in inner and outer peripheries of the coil, and partially providing outer and inner peripheral connectors at both axial ends in a circumferential direction. CONSTITUTION:A shaft 11 is integrally mounted on a rotor 1. A yoke 3 disposed on the outer periphery of 2-pole magnetized portion 8 of the rotor 1 in a stator 2 are formed in double cylinder and contained so that coils 5, 6 are axially aligned between the outer and inner peripheral sides, and the yoke 4 disposed on the outer periphery of the 4-pole magnetized portion of the rotor 1 contains a coil 7 between the outer and inner peripheral sides in double cylinder. The coils 5-7 are all annularly formed concentrically with the rotor 1. The yokes 3, 4 are partly provided with a connector 10 for connecting the outer peripheral side and the inner peripheral side at both axial ends. The position of the rotor 1 is detected by a magnetosensitive element 14 to turn transistors 15, 16 ON and OFF, thereby controlling the currents of the coils 5, 6 to rotate the rotor 1.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to Tanabata, particularly a tanabata device comprising a rotor made of a permanent magnet, and a stator made of a cylindrical yoke and a coil arranged around the outer periphery of the rotor. Regarding a rippleless motor.

[Background Art] A coil that is driven in accordance with the rotational position of the rotor in the Rashires Tanabata is arranged on the inner peripheral surface of the yoke so that its axial direction is aligned with the axial direction of the rotor. Therefore, the coil is formed into a so-called saddle shape in order to be adhesively fixed to the inner peripheral surface of the yoke. In particular, in the two-pole raceless type disclosed in Japanese Patent Publication No. 55-44550 shown in FIGS. 9) are arranged in the axial direction, and the stator +
The two pairs of [il □□□) Oka in 21 are also excited in accordance with n, resulting in a configuration as shown in FIG. In other words, the coil (20) had to be formed into such a shape, and it was difficult to adhesively fix it to the inner peripheral surface of the cylindrical yoke @1), resulting in poor assembly efficiency. Note that the circle in FIG. 1 is a magnetically sensitive element such as a Hall element, and (l is the axis.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to simplify the manufacturing of the coil without having to mold the coil into a complicated shape, and to improve dimensional accuracy. The purpose of this is to provide a Tanabata festival that is easy to assemble since it is expensive.

[Disclosure of the Invention] Of the coil and yoke that constitute the stator, the coil is formed into an annular shape coaxial with the rotor, and the yoke is formed into a double cylindrical shape located on the inner and outer peripheries of the coil. It is characterized in that a connection part connecting the outer circumferential side and the inner circumferential side is partially provided at both ends in the circumferential direction, and the inner circumferential surface of the yoke facing the rotor via the 41 knob is provided. The coil is designed to be excited to a desired magnetic pole depending on the direction of the current flowing through the coil and the position of the connection part. In this case, the connection parts at both ends of the yoke in the axial direction are arranged alternately in the circumferential direction, but from the viewpoint of assembly, the yoke is assembled into a plurality of divided bodies each having a U-shaped 117T surface in the axial direction. In addition, if you want to obtain the same previous work as the unique two-pole brushless Tanabata without dead center shown in the above publication,
In addition to using a rotor having the same configuration, at least two coils arranged in the axial direction, a yoke made up of two divided bodies, and another three parts made up of four divided bodies arranged in the axial direction are used. It is good to configure a fixed 1,000-kin structure using rito.

The present invention will be described below based on the illustrated embodiments shown in FIG. 4 and below. Figures 4 to 9 show an embodiment of a two-pole Lasilles DC Tanabata.
+41 and five axially aligned coils [5i +6+ +
This is a stator consisting of 7+. The rotor (1), in which the two-pole magnetized part (8) and the bull-pole magnetized part (9) are arranged in the axial direction, has a bearing stand 0.
21 (12) bearing (+3+) A shaft (11) whose both ends are supported by The yoke (3) has a double cylindrical shape and has two sets of coils (+5) (61) arranged in the axial direction on the outer circumferential side and the inner circumferential side. The yoke (4) located on the outer periphery of the portion (9) also has a double cylindrical shape and houses the coil (7) between the outer periphery and the inner periphery.

These coils (5+ (e+ (7)) here are all annular ones coaxial with the rotor +11. (I(
The magnetic sensing element i, θ5) is a transisister.

Now, regarding these double cylindrical yokes (3) and (4),
Both have a connection part (10) connecting the outer circumference side and the inner circumference side at both ends in the axial direction, but the connection part (lO) is provided partially in the circumferential direction, and the connection part on one end side. The portion (10) and the connecting portion (lO) on the other end side are arranged alternately in the circumferential direction. In addition, this connection part (l
O) is one at each end of the yoke (3) and two at each end of the yoke (4);
The circumference of each connection part (101) is set to be half a circumference in the yoke (3), and 1i4 circumferences in the 3-way (4),
They are also positioned at equal intervals.

In providing the yokes +31 and +41 of this type, it is easy to obtain them by assembling a plurality of divided body shafts (1) as shown in Figs. 6 and 7. Coils (7) are installed inside the divided bodies f3 (fl 10) by combining them so that their opening directions are alternate.
, [5+ (61 is stored.

In the stator (2) configured in this way, the coil (
51 (61 (direction of current flowing through 71 and yoke (3) (4
yoke (3) in relation to the position of the connection (l) at )
The inner peripheral surface of the yoke (4) is excited so that it has two poles, and the inner peripheral surface of the yoke (4) has four poles. In other words, as shown in Fig. 8(a) K, when a current is passed from the front side to the other side of the coil (7) in the yoke (4) with the connection part (101 located below), the current is KN on the left side (outer circumferential side) in the figure. The S pole occurs on the right side (inner circumferential side),
Even if the direction of the current is the same, if the connection 5 (tol) is above, the S pole is on the outer circumference and the N pole is on the inner circumference, as shown in Figure 8 (b).
The yoke (3) with one connecting part (lω) on each end produces two magnetic poles, and the connecting part (yoke (4) with two 101's on each end produces four magnetic poles). They are made to do so.

Then, as shown in FIG. 9, the position of the rotor il+ is detected by a magnetically sensitive element such as a Hall element, and two transistors (I5) are turned on and off alternately. [6] Because the current flows in both coils +6+ and +61 in opposite directions, the magnetic poles on the inner peripheral surface of the yoke (3) change, causing the rotor (1) to rotate. . The coil (
By determining the positional relationship between the yokes (3) and yokes (4) so that the torque generated by the yoke 7) and the bull pole magnetized part (9) is maximized, the generated torque as a whole can be high enough to have no dead center. It becomes a thing of efficiency. If you do not consider this point, either one of the three
-ku (3) +4] Of course, it is also possible to make @ only.

Figure 10~12r2! Another example is shown in U. This is the divided body el) (40
In j, the opening width of the other divided body t301140) to be combined is set as -! The other is that a lid part (16) is provided on the body to reduce the size of the magnetic instep, thereby increasing the magnetic efficiency. In this case, in the above embodiment, there are four divided bodies (40) @
Since the yoke (4) comprising the yoke (4) can be integrated into two divided bodies (40) by the lid 506), assembly is also facilitated.

In the above embodiment, two coils (5i (6ii) are arranged in the yoke (3) corresponding to the two-pole magnetization 5 (8) of the rotor tl+, but the current direction can be reversed by using one coil. In addition, the position of the non-connecting part between the outer circumference @1j and the inner circumference side of the yoke +3+ +41 does not necessarily have to be at the end face in the axial direction, but may be at a position shifted toward the outer circumference side or the inner circumference side. It's okay.

[Effects of the Invention] As described above, in the present invention, the direction of the current flowing through the coil and the position of the connecting portion that connects the outer periphery 1i11 and the inner periphery of the double cylindrical yoke at the axial end It controls the magnetic poles in the stator, and the coil is annular and coaxial with the rotor, so there is no need to mold the coil into a special shape, making it easy to manufacture the coil and assemble it with the yoke. Moreover, the coil does not come into contact with the rotor.

[Brief explanation of drawings]

@ Figure 1 is a longitudinal cross-sectional view of the conventional example, Figures 2 (a) and (b) are cross-sectional views taken along the X-X line and Y-Y line of the same as above, Figure 3 is a perspective view of the same coil as above, and Figure 4 is a cross-sectional view of the same as above. Vertical sectional view of one embodiment of the present invention, No. 5
The figure is a broken perspective view of the stator, Figures 6 and 7 are exploded perspective views of the same as above, Figures 8 (a) and (b) are explanatory views of the same as above,
FIG. 9 is a circuit diagram of the same as above, FIG. 10 is a cutaway perspective view of a stator of another embodiment, FIGS. 11 and 12 are exploded perspective views of the same as above, il+ is a rotor, +2] is a fixed Amago, +311
4) is 3-ri, +5j (61+7j is the coil, (8)
is the bipolar visual capital, (9) is the beef polar am capital, (101 is the connection part, (3L]) ke0) is the divided body sound. Agent Patent Attorney Ishi 1) Chief Figure 1 Figure 2 (0') (b')

Claims (1)

[Claims] tl+ Tanabata is equipped with a rotor formed of a permanent magnet, and a stator consisting of a cylindrical yoke and a coil arranged around the outer periphery of the rotor, the coil being connected to the rotor. The yoke has a coaxial ring shape, and the yoke has a double cylindrical shape located on the outer and inner circumferences of this coil, and a connection part connecting the outer circumference side and the inner circumference side is partially provided in the circumferential direction at both ends in the axial direction. Claims characterized in that: The heptad described in paragraph 1. (3) The rotor shall have a two-pole magnetized part and a four-pole magnetized part aligned in the axial direction, and the stator shall be a yoke consisting of two divided bodies. The Tanabata festival according to claim 1, characterized by: