JPH06343236A - Brushless motor - Google Patents

Abstract

PURPOSE:To achieve a thin profile, reduction in man-hours and a low cost by providing an opening part on the side of the base part of the salient pole of a stator core, winding a crossover wire between the salient poles of the winding around the specified salient pole, passing the moving part of the stator winding to the next phase over or under the opening part, and using the passing wire of the opening part as a part to be fed of the stator winding. CONSTITUTION:A stator coil winding is constituted of a winding 10 in an (n) phase (n is an integer of 2 or more) and a stator core 1, which has (m) pieces (m is a positive integer) of salient poles 3 per one phase, respectively. An opening part 2a is provided at the base part of the salient pole of the stator core 1. Crossover wires 4, 5, 6 and 7 between the salient poles of the winding 10 are wound around the specified salient pole 3. The moving part of the stator winding to the next phase is made to pass over or under the opening part 2a. The wire passing the opening part is used as the part to be fed of the stator winding. The number of the winding of the specified salient pole 3 of the stator coil winding is subtracted from the number of the winding of the other salient pole. The sums of the subtracted numbers of the windings in the respective phases are made equal in this constitution. Thus, the crossover wires can be soldered to a circuit board 17 directly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor with an iron core used in various office automation equipment and industrial equipment.

[0002]

2. Description of the Related Art In recent years, the trend toward downsizing and thinning of brushless motors has been accelerated with downsizing of office automation equipment, and further cost reduction is required together with ultrathinning.

A conventional brushless motor will be described below. 6 (a) is a sectional view of a motor in a conventional embodiment, FIG. 6 (b) is a plan view of a stator coil winding, FIG. 7 is a partial sectional view thereof, and FIG. 8 is a winding connection circuit diagram.

In FIG. 6 (a), a motor drive circuit board 17 having a rotor rotation angle position detecting means, a bearing 19, and a stator coil winding 10 wound around a stator core 1 having a plurality of salient poles. A rotor 18 having an annular magnet 20 whose inner circumference is magnetized in multiple poles is rotatably supported by a bearing 19, and the stator core 1 has a plurality of salient poles 3 as shown in FIG. 6B. A winding wire 10 is provided on each salient pole. In the example of the figure, the number of phases is n = 3 (hereinafter, windings of three phases are called U-phase, V-phase, W-phase) and m = 4, and a total of 12 convex poles are wound.

A description will be given below with reference to FIGS. 6 (b), 7 and 8. First, set the winding start line of the coil to the terminal pin 8U.
After winding 5 to 6 times, the salient pole U1 (hereinafter the salient pole is
(Omitted) clockwise (hereinafter, the winding direction is viewed from the outer side of the convex pole), and U2, U3, U4 are sequentially wound in the same winding direction. Set the winding end line of U4 to terminal pin 8
After being wound around C for 2 to 3 times, it is wound around V1 counterclockwise and V2, V3, and V4 are sequentially wound in the same winding direction. V4
The winding end wire is sewn between the salient poles of the core and laid over, and wound around the terminal pin 8V 5 to 6 times, and then the coil wire is cut. For the W phase, the coil wire is wound around 8W 5 to 6 times, and then wound around W1 in the clockwise direction.
W4 is wound in the same winding direction. The winding end line of W4 is sewn between the salient poles of the core, laid across, wound around the terminal pin 8C 5 to 6 times, and then cut. Since the V phase is wound in the opposite direction to the U phase, the coil winding connection is a so-called Y in which the terminal pins 8U, 8V, and 8W are three-phase fed terminals and 8C is a common terminal as shown in FIG. It becomes a wire connection.

Terminal pins 8U, 8V, 8W and 8C wound with coil terminal wires are soldered 9 and then bent 90 degrees to face the terminal pins 8 shown in FIG. 6 (a).
It is soldered to the power supply portion 14 provided on the motor drive circuit board 17.

[0007]

However, in the above-mentioned conventional structure, the terminal pin diameter for winding the end of the stator coil winding around the terminal pin, the wire diameter of the coil wound around the terminal pin, the coil wire pre-solder, etc. There was a problem that it was not possible to make it thin due to the restriction of the height dimension, and assembly man-hours such as terminal pin installation, winding of the stator coil wire around the terminal pin, and preliminary soldering after winding were required, which was an obstacle to cost reduction. .

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a brushless motor which is thin, has a reduced number of assembling steps, and is inexpensive.

[0009]

In order to achieve this object, a brushless motor of the present invention comprises a motor drive circuit board having a rotor rotation angle position detecting means, a bearing, and a stator core having a plurality of salient poles. In a brushless motor in which a rotor including a wound stator coil winding and an annular magnet having an inner circumference magnetized with multiple poles is rotatably supported by the bearing, the stator coil winding has n phases (n Is a whole number greater than or equal to 2) and a stator core having a total of nm (m is a positive integer) convex poles, each of which has m windings per phase, and the stator core has a convex pole base side. Has an opening in the winding, and wraps the crossover wire between the convex poles of the winding wire around a specific convex pole, and passes the transition part of the stator winding wire to the next phase either above or below the opening, and Stay The winding number of the specific-salient stator coil windings to the power-supplied portions of the windings subtracted from the other salient pole winding number, yet winding subtrahend sum of the respective phases are equal configuration.

Further, the motor drive circuit board has a structure in which an opening is provided at a position facing the opening passing line of the stator core.

[0011]

With this configuration, since the crossover wire that passes above or below the opening of the stator core can be directly soldered to the circuit board, the size in the height direction due to the terminal pin diameter and coil wire diameter can be significantly reduced. Thinning is possible. Further, continuous winding, that is, so-called one-stroke writing is possible without cutting the winding coil on the way, and the winding time can be reduced. In addition, it is possible to provide a thin and inexpensive brushless motor because the number of assembling steps such as attaching the terminal pin, winding the coil wire around the terminal pin, pre-soldering, and bending the terminal pin are unnecessary.

[0012]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
This will be described with reference to (a), FIG. 1 (b), FIG. 2, FIG. 3, and FIG.

FIG. 1A is a sectional view of the motor, and FIG.
Is a plan view, FIG. 2 is a winding development view, and FIG. 3 is a winding connection circuit diagram. In FIG. 1A, the basic configuration of the motor is the same as that of the conventional example, but the connecting wires 4, 5, 6, of the winding wire 10 are arranged.
7 is directly soldered to the power feeding portion 14 provided on the motor drive circuit board. Hereinafter, description will be made with reference to FIG. 1B, FIG. 2, FIG. 3, and FIG.

The winding start line is wound around U2 once clockwise and wound around U1 clockwise. In this embodiment, the crossover wire 4 passing over the core opening 2a serves as a U-phase power-supplied portion. Sequentially wind in the same direction as U2, U3 and U4. However, the number of turns of U2 is (number of turns of other convex poles-2). The winding end line of U4 is wound around V2 counterclockwise once and passed over the core opening 2b, and wound around V1 counterclockwise. The connecting wire 5 formed at this time serves as a common terminal for so-called three-phase Y connection. Hereinafter, V2, V3, and V4 are wound in the same direction. However, V2
The number of turns is (the number of turns of other convex poles-2). The winding end line of V4 is shown by the slot 12a between U2 and W4.
From top to bottom in (b) (the paper is omitted below) W4
Then, the slot of V3 is passed from the bottom to the top so as to pass over the opening 2c, and is wound around V2 once counterclockwise, and then wound around W1 clockwise. The crossover 6 formed at this time serves as a V-phase and W-phase fed portion. Thereafter, W2, W3 and W4 are sequentially wound in the same direction. However, any one of W1, W2, W3, and W4 is wound with the number of turns of other convex poles-2. W4
The winding end line of U3, W1 from top to bottom W1, V2
The gap is passed from the bottom to the top, passes through the opening 2b, and is wound around V1 once counterclockwise to finish the winding. The crossover 7 formed at this time also serves as a common terminal for the three-phase Y connection. The winding end wire is fixed to the core or the coil winding wire with the adhesive 11, and the extra wire is cut. The winding start line is pressed by the U2 winding line and does not unravel, so it is cut as it is.

In recent thin motors, in order to increase the number of windings of the winding coil around the salient poles, so-called aligned winding is carried out, that is, the coil wire cross-sections are wound in order so that the bales are stacked without gaps as shown in FIG. However, if the number of windings increases, the length d of the winding portion is determined, and thus the aligned winding cannot be performed.
As shown in FIG. 2, since V2 has two detour windings for routing the crossover wire, V2 is (number of windings to other pole-2) and V2 has the same number of windings as the other pole in total. Therefore, the aligned winding is maintained. Further, in order to equalize the torque generated in each phase, the U phase and W phase have only one pole (number of turns to other pole-2).
Make a winding. As a result, continuous winding without cutting the coil wire from the beginning to the end of winding, that is, a so-called one-stroke writing winding, can reduce the winding time. The above winding and wiring work can be easily realized by an automatic winding machine.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. 1B, 3 and 5.

Since the V phase is wound in the opposite direction with respect to the U phase and the W phase, as shown in FIG. 3, 4Us, 6Ve, and 6Ws of the crossover wire on the opening are used as the three-phase fed terminals and 5V.
It is possible to make a three-phase Y connection using e, 5Vs, and 7We as common terminals. 4Us, 6Ve, 6Ws and 5V
e, 5Vs, and 7We (1 bundle at 3 places) are soldered to the power feeding portions (soldering lands) of the opposing motor drive circuit boards. After that, the wire 6 is cut off between 6Ve and 6Ws to complete the electrical wiring.

In FIG. 5, the motor drive circuit board opening 23 provided on the motor drive circuit board facing the crossover 6
Use to cut the crossover. The crossover wire is cut by inserting a V-shaped crossover wire sandwiching jig from the paper surface of FIG. 5 toward the opening, sandwiching the crossover wire, and then pulling it up. By the action of the opening, the motor drive circuit board can be easily cut without damaging it.

[0019]

According to the present invention, the stator core has the opening on the side of the base of the salient pole, and the connecting wire between the salient poles of the winding is wound around a specific salient pole, and the transition portion of the stator winding to the next phase is wound. To pass through the upper side or the lower side of the opening, the opening passing wire can be used as the power-supplied portion of the stator winding and can be directly soldered to the circuit board, resulting in the conventional terminal pin diameter and coil wire diameter. The size in the height direction can be reduced, and the thickness can be greatly reduced. Since the winding coil can be continuously wound without cutting in the middle, the number of assembly steps such as terminal pin mounting, coil wire winding around the terminal pin, pre-soldering, and terminal pin bending are unnecessary, and it is thin and inexpensive brushless. A motor can be provided.

[Brief description of drawings]

FIG. 1A is a sectional view of a brushless motor according to a first embodiment of the present invention. FIG. 1B is a plan view of a stator winding according to the first embodiment of the present invention.

FIG. 2 is a development view of a stator winding according to the first embodiment of the present invention.

FIG. 3 is a connection circuit diagram of a stator winding according to the first embodiment of the present invention.

FIG. 4 is an explanatory view of coil wire alignment winding in the first embodiment of the present invention.

FIG. 5 is a plan view of the stator of the brushless motor according to the second embodiment of the present invention.

6A is a cross-sectional view of a conventional brushless motor, and FIG. 6B is a plan view of a conventional stator winding.

FIG. 7 is a partial sectional view of a conventional stator winding.

FIG. 8 is a connection circuit diagram of a conventional stator winding.

[Explanation of symbols]

 1 Stator Core 2 Opening 3 Convex Pole 4, 5, 6, 7 Crossover 8 Terminal Pin 9 Solder 10 Winding 11 Adhesive 12 Slot 14 Power Supply 17 Motor Drive Circuit Board 18 Rotor 19 Bearing 20 Magnet 21 Stator Coil Winding 22 Position detection means 23 Motor drive circuit board opening

Claims (2)

[Claims] 1. A motor drive circuit board having a rotor rotation angle position detecting means, a bearing, a stator coil winding wound around a stator core having a plurality of salient poles, and an inner periphery magnetized with multiple poles. In a brushless motor in which a rotor provided with a ring-shaped magnet is rotatably supported by the bearing, the stator coil windings are n-phase (n is an integer of 2 or more) windings, and m coils are provided for each phase. The stator core has a total of nm (m is a positive integer) convex poles to which the winding wire is applied, and the stator core has an opening on the side of the base of the convex pole, and the connecting wire between the convex poles of the winding wire has a specific convexity. The stator coil winding is wound around a pole, the transition portion of the stator winding to the next phase is passed through the upper side or the lower side of the opening, and the stator core opening passage line is used as a fed portion of the stator winding. Specific convex A brushless motor characterized in that the number of windings of a pole is reduced from the number of windings of other convex poles, and the total number of winding reductions of each phase is equal. 2. The brushless motor according to claim 1, wherein an opening is provided on the motor drive circuit board at a position facing the stator core opening passing line.