JPH06311712A - Two-phase motor - Google Patents

Abstract

PURPOSE:To reform a two-phase motor in such a structure that such an trouble as the destruction of interphase insulation, abnormal overheating of a stator, etc., which has occurred due to two-phase coils coming into contact with each other can be prevented. CONSTITUTION:The stator coils of the title motor having a U- and X-phase coils are constituted in such a way that one ends of the coils are connected to a common terminal. V and the U-phase coil is connected to a U-phase terminal U after winding the coil in series to its terminal pole after a prescribed number of poles from the first pole. Then the X-phase coil is connected to an X-phase terminal X after winding the coil, in series to its terminal pole after a prescribed number of poles from the first pole counterposed to the first pole of the U phase in the direction opposite to the winding direction of the U-phase coil and a two-phase three-wire power source is connected between the terminals U and X. It is also possible to connect a capacitor between the terminals U and X and a single-phase power source between the terminals U and V.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a two-phase motor having an induction motor, a synchronous motor, a DC brushless motor or the like having a two-phase winding having one end common to a stator. .

[0002]

2. Description of the Related Art First, a conventional technique will be described with reference to FIGS. In FIG. 6, the stator of the electric motor 2 having the two-phase winding composed of the coils 3a and 3b is connected to the two-phase power source 1 which has a phase difference of 90 ° electrically to each other, and the coils 3a and 3b are connected to each other. Energize each coil 3a, 3b
Is commonly connected to the power source 1. In this case, each of the two sets of coils corresponding to the two-phase power source 1 is wound with an insulated conductor in which a coating such as enamel is provided on the conductor, and the motor has a number of poles. The coil is wound around each group for each pole. For example, in the case of a four-pole electric motor, the coil is usually composed of four groups for each phase.

In a two-phase stator coil, the spatial arrangement of each coil is usually electrically displaced by 90 ° and wound, and the distribution state of the conventional coil is as shown in FIG. The U-phase coil and the X-phase coil forming the two phases are always in contact with the magnet wire forming the coil in the slot and at the coil end (not shown) though the insulating film is interposed therebetween. It will be. That is, in the conventional one, as shown in FIG. 7, the 4-pole coil distribution is based on the first pole U1 of the U-phase coil connected to the common terminal V, and the U-phase coil center of this pole The first pole X1 of the X-phase coil is wound at a position electrically displaced by 90 ° in the direction opposite to the winding direction of the coil, and the winding is advanced in the same direction as the U-phase coil, and each of the terminal poles U4 and X4 is wound. Is connected to each terminal U and X via. Therefore U
4 and the coil of X4 are in contact with each other.

[0004]

By the way, in the conventional structure, the two-phase coils formed by winding the magnet wire directly connected to the power source as described above are in contact with each other. As a result, the interphase voltage is applied to these coils as they are, and a large electrical stress is applied to the insulating coating. During this period, the interphase insulation is destroyed, causing abnormal overheating of the stator and large power wiring. There is a problem that an electric current may flow to cause overheating or burning. The present invention has the above-mentioned problems (problems) of the conventional ones.
It is an object of the present invention to provide a two-phase electric motor that solves the above problem.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a stator winding whose U phase and X phase of a power supply.
The distribution of the coils is improved so that the coils of the terminal poles connected to the phase terminals do not touch each other. As a means for this, this is done at the common terminal V of the U-phase and X-phase coils. As a reference, the coil center of the pole forming the first pole is displaced by 90 ° in the direction opposite to the winding direction of the U-phase coil, and the X-phase coil is arranged. The X-phase coil is the U-phase coil. By winding in a reverse direction, a predetermined number of poles are wound from the first pole and connected to predetermined terminals of U-phase or X-phase, respectively.

[0006]

With the above-mentioned structure, the coils of the poles of the terminals connected to the U-phase and X-phase terminals do not contact each other, and the U-phase and X-phase terminals do not contact each other. The voltage applied between the coils is lower than the U-phase and X-phase voltage,
That is, it is reduced by about 21% in the case of a 4-pole stator and by about 25% in the case of a 6-pole stator, so that the occurrence of dielectric breakdown between the U-phase and V-phase coils can be reduced, and the coil and power supply line are overheated and burned out. Can be prevented.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 is a circuit diagram of a stator of an electric motor operated by a two-phase power source to which the present invention can be applied. In FIG. 6, the U-phase and the X-phase two-phase three-wire type power source 1 and the electric motor 2 are accommodated. The U-phase terminal U, the X-phase terminal X, and the common terminal V of the U-phase coil 3a and the X-phase coil 3b of the stator coil are provided, and these terminals have a predetermined number of poles, that is, four poles in FIG. The coil groups U1 to U4 and X1 to X4 are connected in series. In the case of FIG. 2, since there are 6 poles, U1 to U6 and X1 to X6 are connected in series to form the stator coil 3. These stator coils 3 are wound with a coil material called magnet wire in which an insulating coating such as enamel is baked on a conductor.

FIG. 1 shows a 4-pole coil distribution in which the stator coil distribution of the present invention is shown in units of poles. The feature of the present invention is that the X-phase coil is wound in the opposite direction to the U-phase coil. is there. By thus distributing the U-phase and X-phase coils, the terminal poles U4 and X4 of the respective phases do not contact each other. In the case of the coil distribution of the present invention as well, the first pole U1 of the U-phase coil connected to the common terminal V is used as a reference and the coil center of this pole is U.
It is the same as in the conventional case of FIG. 7 that the position electrically displaced 90 ° in the opposite direction to the winding direction of the phase coil is the center of the X-phase first pole X1.

FIG. 2 shows the present invention applied to a 6-pole coil distribution. The relationship between the first poles U1 and X1 of the U-phase and X-phase coils connected to the common terminal V is the same as the relationship in FIG. 1 in terms of electrical angle. With such a configuration, the U-phase terminals U and X
The terminal poles U6 and X6 of each phase coil connected to the phase terminal X are not in contact with each other.

FIG. 3 is a simplified view of the 4-pole coil distribution of FIG. 1 in which the coils are housed in a 16-slot stator core (not shown) by winding the coils in an overlapping manner. There is only one coil, but the number of slots is changed to 1
Even if the number of coils forming the poles is increased or the number of poles is increased to more than 6, the same effect as that of the present invention can be obtained. However, the method of the present invention does not hold for a two-pole stator. FIG. 4 is a schematic diagram showing the relationship of voltage application between the U-phase and the X-phase of FIGS. 7 and 1 in order to compare the present invention with the conventional one. Voltage eu in the coils U1 to U4
1 to eu4, voltages in coils X1 to X4 are ex1 to e
If x4 is set and each is set to 1.0 to simplify the calculation, (4.0 ² +4.0 ² ) ^1/2 = 5.66, which corresponds to the phase voltage Vp.

In the system of the present invention shown in FIG. 1, the voltage applied between the coils which contact each other is (2.0 ² +4.0 ² ) ¹ from the contact state of the coils U1 to U4 of each phase and X1 to X4. ^{/ 2}
= 4.47, and in Fig. 7, since U4 and X4 contact each other, 5.66 corresponding to Vp is added ((4.4
7 / 5.66) × 100 = 79%, which is a reduction of 21% compared with the conventional method. In the case of 6 poles in FIG. 2, U1 to U
6, X1 to X6 voltages are eu1 to eu6, ex1 to
If ex6 is set to 1.0, (6.0 ² +6.
0 ² ) ^1/2 = 8.49, which corresponds to Vp, and U6 and X6
, The maximum applied voltage between the coils is (2.0 ² +6.0 ² ) ^1/2 = 6.32 (6.32
/8.49)×100=75%, which means that only 75% of the interphase voltage of the power supply 1 is applied. Therefore, 25
% Reduction. FIG. 5 shows a case in which the capacitor 4 is connected between the U-phase terminal U and the X-phase terminal X, and the single-phase power source 5 is connected between the U-phase terminal U and the common terminal V to operate as a capacitor motor. In such a case, the same effect can be obtained.

[0012]

In the two-phase motor according to the present invention, the coil arrangement is improved so that the interphase voltage on the power supply side is not directly applied to the coils between the two phases. By reducing the voltage applied to
It has the excellent effects of reducing the dielectric breakdown between both phases, preventing the coil from overheating and burning, and preventing overheating and burning due to the excessive current of the wire from the power supply due to the power supply short circuit, resulting in a safe electric motor. .

[Brief description of drawings]

FIG. 1 shows the stator coil distribution of the present invention in units of poles.
It is a pole coil distribution.

FIG. 2 is a coil distribution when the present invention is applied to a 6-pole stator.

FIG. 3 is a coil connection diagram when FIG. 1 is wound around a 16-slot stator core.

FIG. 4 is a schematic vector diagram for explaining an applied voltage in a 4-pole stator.

FIG. 5 is a circuit diagram of a stator when operated using a capacitor with a single-phase power supply.

FIG. 6 is a circuit diagram of a stator of an electric motor operated by a two-phase power source in each case of the present invention and the conventional one.

FIG. 7 is a 4-pole coil distribution diagram showing a conventional stator coil distribution on a pole-by-pole basis.

[Explanation of symbols]

 1: Power supply 2: Electric motor 3: Stator coil 4: Capacitor 5: Single-phase power supply

Claims (2)

[Claims] 1. A stator coil having two-phase coils of U and X, wherein one end of the two-phase coil is connected to a common terminal V, and a terminal having a predetermined number of poles from the first pole of the U-phase coil. Starting from the point where the first pole of the X-phase coil is electrically displaced by 90 ° in the opposite direction to the winding direction of the U-phase with respect to the first pole of the U-phase. It is characterized in that it winds up to the terminal pole in the direction opposite to the winding direction of the U phase and connects to the X phase terminal X, and connects each terminal U, X, V to a 2-phase 3-wire power supply. A two-phase electric motor. 2. The two-phase system according to claim 1, wherein a capacitor is connected between the U-phase terminal U and the X-phase terminal X, and a single-phase power source is connected between the U-phase terminal U and the common terminal V. Electric motor.