JPS59110360A - Brush mounting structure for motor - Google Patents

Abstract

PURPOSE:To improve the efficiency of a motor and to reduce the cogging of the motor by alternately arranging interpoles having large attraction force to a permanent magnet rotor and interpoles having small attraction force thereto along the rotating direction at the intermediate position of the main poles of a stator core, thereby increasing the circumferential width of the interpoles. CONSTITUTION:Interpoles Q1, Q2 of a stator core 1 are set equally in the circumferential width in such a manner that the axial length of one interpole Q1 is longer than that of the other interpole Q2. A permanent magnet rotor 2 is coupled to a rotational shaft 5 through a cylindrical yoke 4, the shaft 5 is inserted into an axial hole 6 of the core 1, and the rotor 2 is rotatably provided around the core 1. Further, a printed board 7 is mounted under the core 1, and a Hall IC 8 for detecting the rotary position of the rotor 2 and a pair of transistors 9, 10 for exciting the coil 3 of the core 1 are mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-moving Zara Shires Tanabata.

FIG. 1 is a schematic diagram of a conventional two-phase brushless Tanabata system. In Figure d41, (1) is the stator core, (
2) is a permanent magnet rotor, which rotates the permanent magnet rotor (2) by a magnetic field generated by a coil Ial wound around the stator core (1).

However, at the time of startup, if the permanent magnet rotor (2) is at the dead center position with respect to the stator core (1) as shown in No. It was necessary to shift the magnet rotor: 2) from the dead center position as shown in Figure 1. Therefore, conventionally, as shown in Fig. 42, commutative poles Q are provided between the main poles P of the stator core +1), and the angles j rectangles θl and θ2 between the adjacent main poles P and the complement 1mQ are By setting different angles, the fi between the stator core 1) and the permanent magnet rotor (2) is
Attempts have been made to shift the tff relationship from the dead center position as shown in FIG.
) The area that receives the magnetic flux from the magnetic flux inevitably decreases, resulting in a decrease in efficiency. Furthermore, if the air gap between IIJ between each main pole P and commutator pole Q is large, the magnetic resistance will be uneven in the valve material, and there will be a problem that the upper part will become loose due to the rotation of the permanent magnet rotor (2). Ta. Here, the term ``coF'' refers to an egg 41iJ that occurs when the permanent magnet rotor (2) is attracted and repelled by the stator core 11) and attempts to settle into a magnetically stable position. In order to reduce the ji, the main pole P and ? A group of gaps with m-pole Q-
Power 5 is small! It is desirable that the air resistance be uniform.

The present invention has been made in view of point 7 as mentioned above, and it is possible to widen the circumferential direction of the interpolation by =1 to improve efficiency, and to reduce 4-/ The purpose is to provide a brushless brushless with a -9.

The configuration of the present invention will be described below with reference to illustrated embodiments. Third
Figure (a) is a thousand-sided view of the present invention;
b) is a perspective view showing the outer shape of the stator center (l) used in the above. As shown in each figure above, stator core (1)
The circumferential width of each of the complementary electrodes Q1 and Q2 is set to a certain value, and the axial length of one of the complementary blood poles Q1 is the same. 4th 1
This is an exploded perspective view of the Ruzu Lasires Tanabata, which is based on this actual gun example. As shown in the figure, the permanent magnet rotor: 2) is connected to the rotating shaft (11) via a cylindrical yoke (+++, and this rotating shaft i5) is the shaft hole of the stator core; 1), 6) The permanent magnet 0-tor (2) is fitted into the stator core (1) and rotates freely around the stator core (1). (
7) is a disc-shaped glue lift board which is attached to the lower VC of the stator core (l), and includes a Hall IC 181 for detecting the rotational position of the permanent magnet rotor 12), and a stator core (l).
)'s coil 13) is excited by a pair of transisisters +91
The actual speed is 7, such as t+01. FIG. 5 is a circuit diagram of the Tanabata no Kaku-Yoro which is used for the vC lift board 17), and FIG. 6 is its 41hf'l: explanatory diagram. Also, Figure 7 shows the coil 3 to the stator core (+).
) Shows how to wind (32). However, Fig. 6 (
As shown in a), when the strength H of the magnetic field detected by the hole 108) exceeds the predetermined standard 1lfHCe, the hole 1c
The output of 18) is 1(sit) as shown in FIG.
The signal becomes a bell, the transistor (9) turns on, and the transistor (9) turns off. In addition, if the strength H of the magnetic field detected by the hole 1ctsl is less than the predetermined standard 1c), the hole +
The output of 1/I C18) is L as shown in Figure 6 ω)K.
Level 1, try 3; star (9) off, try
) jista; 10) becomes oshi. Therefore, the coil (31) (3□) of the stator core 11) is
The permanent magnet rotor (2) is excited alternately according to the military style, and the permanent magnet rotor (2) is excited in this case. As mentioned above, the circumferential widths of each of the complementary poles Q2 disposed between the main poles P are all equal, < L, and the 711th complementary pole in the direction of one arm of the complementary pole Q1. Greater than the axial height of Q2
Since it is a permanent magnet rotor (2),
Since it stands still at a position where it is attracted by Ql and moves slightly away from the dead center position, self-starting becomes easy. In addition, since the circumferential width of each reinforcement QI%Q2 can be made wider than that of the conventional example shown in Figure 2, the efficiency of the magnet is improved. Next, Fig. 8 shows a top view of another practical example of the present invention.In this example, the shapes of sleeve ports Q1 and Q2 and Although the positional relationship is the same, the magnetic quasi-material f forming the commutative pole Q
The magnetic material constituting the cap (2) has a low magnetic permeability.

If you do this, 1. Since the magnetic circuit that passes through Q1 has a lower magnetic resistance than the magnetic circuit that passes through Q2, the permanent magnet rotor '2) should be positioned so that it is attracted to Q1. Since it is stationary L and slightly deviated from the dead center position, it becomes easy to save No. 710 R or S.

-J 9 near 1 + is the plane of a further musical embodiment of the invention. In the case of a false gun, the counterpole Q+ t;-)
The width in the circumferential direction is larger than the width in the circumferential direction of the pole Q2, and the angle θ1 shown in FIG.
larger than Then, permanent Il'5 stone rotor: 2
) is l'iIi! Blood (↓1) It stands still at a position where it is curled up, and is slightly shifted from the dead center position, so it is easy to raise and hook.
Since the width of the yaw and direction can be made wider than that of the conventional table shown in Fig. 2, the efficiency of the 7th and 7th rows is also slightly improved.
7g can also be slightly reduced.

FIG. 10 is a plan view of another example of the present invention. In this example, the scales, positional relationship, materials, etc. of the commutative poles Q8 and Q2 are exactly the same, but each of the h1j poles Ql and Q2V
A C-wound humiliation encouragement coil (closely wound for 91,
The commutating pole Q2 is 11 blue, which creates a magnetic force difference between the commutating pole Q□ and the commutating pole Q2, and the permanent magnet rotor (2) comes to rest at a position where it is attracted to the commutating pole Q1. That's what I do. Therefore, even in this embodiment, the resting position of the permanent magnet rotor (2) is slightly shifted from the dead center position, so that self-starting becomes easy. In addition, since the width of each commutating pole Q1 and Q2 can be made wider than that of the conventional example shown in Fig. 2, the efficiency of Tanabata is improved, and the
This can also reduce the amount of stress.

The present invention has a 4N structure as described above, and includes a permanent magnet rotor having N poles and S poles alternately arranged at equal angles in the direction of rotation, and main wires having the same number of magnetic poles as the permanent magnet rotor. It has a stator core for each pole f-temperature, a stator core that detects the entire position of the permanent magnet rotor - P position - J dimension, and a drive/auxiliary circuit that slides in response to the position sensor output V. A brushless machine with a large interpolation and an oil ladder with a small attraction force against the permanent magnet rotor? Since the permanent magnet rotor is arranged alternately along the rotation direction, the permanent magnet rotor stands still as if it were attracted to the side of the commutating pole that has a large attractive force.

, Therefore, the rest position of the permanent magnet rotor is slightly shifted from the dead center position 16, which has the advantage of facilitating self-starting, and the commutating pole is still disposed at an intermediate position between the main poles. Figure 2: Unlike the conventional example, there is no need to install the wire on only one of the main poles, so the gap created between the main pole and the counter pole can be reduced, making Tanabata more efficient. This has the advantage that it is possible to reduce the magnetic resistance by reducing the sudden change in magnetic resistance due to the air gap.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional example, Fig. 2 is a plan view of a conventional example of music, and A3 drawing (a) is a -N: 11 flat tf of the present invention.
Fig. ii and Fig. 3(b) are a stopper diagram of the stator iron I used in the same as above, Fig. 4 is an exploded perspective view of the same as above, and Fig. 51 is an exploded perspective view of the same.
is the circuit diagram of the drive shaft circuit used on l4, @6 is the same J)
-+ (Illustrated diagram and Figure 7 are plan views showing how to wind the coils around the stator iron I used in the above, and Figures 8, 17, and 101 are different examples of the present invention. Width σ] plane Nu 1. +1+ is the stator core, 12) is the permanent magnet rotor 1.3
) is the coil, P is the main +i% Ql, and Q2 is the complementary pole. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 Figure 1 Figure 9 Figure 8 Figure 10

Claims (1)

[Claims] :1) N alternately at equal angular intervals in the direction of rotation
A permanent magnet rotor magnetized to poles and Si, a stator core having the same number of main poles at equal angular intervals as the magnetic poles of the permanent magnet 〇〇, and a position sensor that detects the position of the permanent magnet 〇〇. At -9, a brushless motor comprising a drive circuit that excites a coil that can be wound around each main pole of the stator core according to the output of the main ratio of the stator core is compensated at the intermediate position of each main ratio of the stator core. A brushless seven-pole structure characterized in that the poles are arranged alternately along the entire rotational direction with reinforcing poles that have a large attractive force to the permanent magnet rotor and counterpoles that have a small attractive force to the permanent magnet rotor. - Evening.