JPH0690537A - Brushless motor - Google Patents

Abstract

PURPOSE:To increase a space factor by a fine wire and shorten times for wiring and terminal processing by utilizing a winding machine by a method wherein wires, wound about a stator core, are connected in -type while wiring is effected without cutting the wires on the half way of winding upon winding about the stator core. CONSTITUTION:A winding wire to U1-U4 is wound to U4 and, thereafter, the winding is started to V1 successively without cutting the wire. In this case, a lead wire between U-V is extracted by a hook provided on a winding machine. The winding to V1-V4 is effected and, thereafter, the lead wire between V-W is extracted in the same manner, then, the wire is wound to W1-W4 and the wire end is brought to the position of starting the winding. According to these operations, -type connection can be realized in one action without cutting thee wire on the half way thereof. Accordingly, the space factor of a brushless motor can be increased and the winding can be effected esily employing a wire having a small diameter. On the other hand, a time necessary for winding around a stator and a time necessary for processing the terminals of the wire can also be reduced remarkably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circumferentially opposed brushless motor having an improved winding between poles of a stator.

[0002]

2. Description of the Related Art A conventional three-phase full-wave drive system for a 12-slot brushless motor will be described. Figure 2 shows the conventional Y
The winding pattern when winding the letter-shaped wire around the stator is shown.

FIG. 2 (a) is a stator having a Y-shaped connection, FIG. 2 (b) is a winding pattern when the Y-shaped connection is applied to the stator, and FIG. 2 (c) is a Y-shaped connection. It shows the final connection diagram after being processed. For the wire wound around each of the U, V, and W phases, it was necessary to electrically connect the terminals at the end of winding or at the beginning of winding after winding to form the Y-shaped midpoint.

[0004]

In order to construct a large output, circumferentially opposed brushless motor with a conventional Y-shaped connection, it is necessary to reduce the winding resistance in order to suppress the amount of heat generation. When the wire is wound with a thick wire, the wire area ratio is poor, and there were restrictions on equipment to wind a thick wire.

Further, generally, in order to peel off the insulating coating applied to the surface of this kind of thick winding material, it is necessary to mechanically peel the insulating coating one by one, and a middle point treatment peculiar to the Y-shaped connection is performed. Therefore, a great number of man-hours were required.

The present invention solves the above-mentioned problems of the prior art. It is possible to increase the wire area ratio with a thin winding and to shorten the winding and terminal processing time by utilizing a conventional winding machine. It aims at providing the brushless motor of.

[0007]

In order to achieve this object, a brushless motor of the present invention has a stator core having windings formed in a triangle shape, and the windings wound around the stator core. At this time, it has a structure in which winding is performed without cutting in the middle.

[0008]

With this structure, it is possible to realize a motor having a winding diameter smaller than that of a conventional motor, and it is possible to increase the linear area factor and increase the conversion efficiency.

In general, the insulating film formed on the surface of the winding material having a small wire diameter can be easily peeled off by applying a temperature such as solder dip.
A total of six terminal lead wires, two for each phase, can be stripped of the insulating film at the same time by solder dipping or the like, which significantly improves workability. In addition, winding can be done with a single stroke, and neither cutting nor midpointing after winding is required.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 (a) is a stator having a Δ-shaped connection, FIG. 1 (b) is a winding pattern when a single-stroke Δ-shaped connection is applied to the stator, and FIG. 1 (c) is a Δ-shape. The final connection diagram after connection is given is shown.

In FIG. 1 (b), the windings U1 to U4 are the same as the Y-shape, but after being wound on U4, they are continuously wound on V1 without being cut. At this time, the lead wire between U and V is put out by the hook provided in the winding machine. Similarly, after winding up to V1 to V4, a lead wire between V and W is drawn out, and winding up to W1 to W4 is performed to bring a winding end line to a winding start position.

If the above operation is performed, one stroke writing
Character-shaped wiring can be realized. Next, the generated torques due to the Y and Δ-shaped connections are compared. FIG. 3A shows the induced voltage generated in each of the U, V, and W phases by the field magnetic flux of the rotating field magnet. Further, FIG. 3B is a diagram schematically showing a conventional Y-shaped connection, and FIG. 3C is a diagram schematically showing a Δ-shaped connection according to the present invention.

Considering a general three-phase full-wave 120 ° energization method, in the case of a Y-shape, calculation is made in the section of 30 ° to 90 °.

[0015]

[Equation 1]

This is the torque generated per unit current. On the other hand, in the case of the triangle shape, electricity is always supplied to three phases, and 0 °, 60 °, 120 °, 180 °, 240 °, 3
Since the energization pattern changes at 00 °, 60 ° to 120 °
You have to calculate in the section. If the current flowing from the U terminal to the V terminal in the Y-shape is I, then in the Δ-shape, U
A current of (2/3) I flows through the terminal-V terminal, a current of (1/3) I flows through the W terminal-V terminal, and a current of (1/3) I flows through the U terminal-W terminal.

When calculation is performed in consideration of this fact,

[0018]

[Equation 2]

It becomes However, if it is considered that the same current I flows in Y and Δ-shaped connections, it is necessary to change the wire diameter D of the winding and the number of patterns n. Therefore,
If the interphase resistance is R, R1 = R2 R1 = 2 × kn1 / (D1) ² R2 = 2 / 3kn2 / (D2) ² k is a constant, and if the winding linear occupancy is the same, n1 (D1) ² = It becomes n2 (D2) ² .

[0020] Thus ^{n2 = 3 0.5 n1 D2 = (} 1/3 0.5) 0.5 · D1 becomes △ shaped connection is the number of turns of the winding in comparison with the Y-shaped connection is 3 ^0.5 times, wire diameter (1/3 ^0.5) It turns out to be ^0.5 times.

The induced voltage the number of turns of winding generated by the field magnetic flux since the 3 ^0.5 times is three ^0.5-fold, (Equation 2) also eventually since three ^0.5 times △ shaped connection and Y- The torque generated by the connection is equal.

[0022]

As described above, according to the present invention, it is possible to increase the wire area ratio of the brushless motor of the circumferentially opposed type, and it is possible to easily wind with a small wire diameter. You can use the equipment from. In addition, since the winding time for the stator and the terminal processing time can be greatly reduced, the manufacturing cost can be reduced.

[Brief description of drawings]

[Fig. 1] (a) is an outline view of a stator having a △ -shaped connection. (B) is a winding pattern diagram when the Δ-shaped connection is applied to the stator by a single stroke. (C) is a △ -shaped connection. Final connection diagram after

[Fig. 2] Fig. 2 (a) is a schematic view of a stator with Y-shaped connection. Fig. 2 (b) is a winding pattern diagram when the Y-shaped connection is applied to the stator. Fig. 2 (c) is after Y-shaped connection. Final connection diagram

FIG. 3A is a waveform diagram of induced voltage of three phases of a stator winding, FIG. 3B is a simplified connection diagram of Y-shaped connection, and FIG. 3C is a simplified connection diagram of Δ-shaped connection.

[Explanation of symbols]

 U One phase of three phases V One phase of three phases W One phase of three phases R1, R2 One phase resistance n1, n2 Number of winding turns D1, D2 Wire diameter

Claims (1)

[Claims] 1. A circumferentially opposed three-phase brushless motor having a rotating portion having a field magnet and a stator core having a winding at a position facing the field magnet, the stator core being provided with the rotor core. The three-phase brushless motor is characterized in that the windings are connected in a triangle shape, and the windings are realized by a single stroke without winding the windings around the stator core.