JPH10174330A - Three-phase armature winding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a conductor space factor in a stator slot and to lower the temperature rise of a winding by using magnet-wires as main windings and disposing auxiliary windings having a specific ratio to the main windings into clearances among the main windings while being connected in parallel with the main windings. SOLUTION: An insulator 2 is laid in a stator slot 1 for a stator core, and main windings 13, in which main magnet-wires are wound in a random winding manner, are housed inside the insulator 2. Auxiliary windings 15 consisting of auxiliary magnet-wires having diameters of 1/10-154/1000 to the main windings 13 are arranged into spaces formed among the adjacent mutual main windings 13 while being connected in parallel with the main windings 13. Accordingly, heat generated by the primary copper loss of the stator winding is transmitted through the auxiliary windings 15, and heat transfer to the stator core is also improved. The temperature rise of a motor is lowered by synergism, in which the efficiency of the motor is also improved by the reduction of primary copper loss.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase armature winding in which a magnet wire is wound around a stator slot and stored.

[0002]

2. Description of the Related Art FIG. 4 is a cross-sectional view showing a state in which a conventional magnet wire wound in a random winding is accommodated in a stator slot. In the figure, an insulator 2 is laid in a stator slot 1 of a stator core (not shown), and a winding 3 formed by randomly winding a magnet wire is accommodated inside the insulator 2. . Then, an insulating wedge 4 is driven into the opening of the stator slot 1, the winding 3 is positioned in the stator slot 1, the end of the winding 3 is tied, and the entire stator core is varnish-impregnated with a varnish processing device (not shown). Then, the winding 3 is fixed in the stator slot 1. The number of the magnet wires constituting the winding 3 is, for example, 34 with the same wire diameter. In the stator slot 1 after the varnish treatment, a varnish 5 is filled in a gap between the magnet wire and the slot wall.

[0003]

However, in such a configuration, the conductor space factor occupied by the magnet wires constituting the windings 3 in the stator slot 1 is low, and the gap between the magnet wires and the magnet -The gap between the wire and the slot wall does not contribute to the operating characteristics such as the torque and temperature of the electric motor and causes an increase in primary copper loss and a decrease in efficiency. In addition, since these gaps are generally small, the varnish-treated varnish does not sufficiently penetrate, and there is a gap between the magnet and the wire, so that heat transfer via the varnish 5 is deteriorated. This is also a factor that increases the temperature rise.

The present invention solves these problems,
The conductor space factor in the stator slot is increased, and the temperature rise of the winding is reduced. Further, the present invention provides a three-phase armature winding for preventing water droplets from adhering to the winding while the motor is stopped.

[0005]

According to a first aspect of the present invention, there is provided a three-phase armature winding in which a magnet wire is wound and housed in a stator slot in a random manner. A wire is used as a main winding, and an auxiliary winding made of an auxiliary magnet wire having a diameter of 1/10 to 154/1000 is connected to the main winding in parallel with the main winding while a gap is formed between the main windings. It is characterized by being arranged.

With this configuration, the space factor occupied by the winding in the stator slot is improved, the primary copper loss generated by the primary winding is reduced, and the motor efficiency is improved. Further, since the auxiliary winding is housed between the main windings, the heat transfer coefficient is improved, and the temperature rise of the motor is reduced due to the synergistic effect of the reduction of the primary copper loss.

According to a second aspect of the present invention, the connection terminals of the respective circuits of the main winding and the auxiliary winding are provided outside the motor, so that the main winding and the auxiliary winding are connected in parallel. Two kinds of characteristics when a power supply is connected only to the power supply are obtained.

According to the third aspect, since the auxiliary winding is used as a space heater when the motor is stopped by single-phase current heating, dew condensation can be prevented with a smaller current than when the main winding is used. Further, since the auxiliary winding is made of a material having a different resistance from that of the main winding or the resistance is made lower than that of the main winding, the primary copper loss can be further reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Figure 1 shows the same magnet
FIG. 4 is a cross-sectional view of a state in which a wire is wound in random winding to form a main winding, and an auxiliary winding having a smaller wire diameter than the main winding is accommodated in a stator slot. In the figure, an insulator 2 is laid in a stator slot 1 of a stator core (not shown), and a main winding 13 formed by randomly winding a main magnet wire is housed inside the insulator 2. (The number of magnet wires is, for example, 34). The main winding 1 is inserted into a space formed between the adjacent main windings 13.
The wire diameter of the main magnet wire forming No. 3 is 154
The auxiliary winding 15 formed by winding the same number of / 1000 auxiliary magnet wires as the main winding 13 is accommodated.

Thereafter, an insulating wedge 4 is driven into the opening of the stator slot 1, the main winding 13 and the auxiliary winding 15 are positioned in the stator slot 1, and the respective winding ends are thread-tied. The entire stator core is impregnated with varnish using a non-varnish treatment device, and the main winding 1 is inserted into the stator slot 1.
3 and the auxiliary winding 15 are fixed. In the stator slot 1 after the varnish treatment, a varnish 5 is filled in a gap between the main and auxiliary magnet wires and the wall of the stator slot 1.

The auxiliary winding 15 is housed between the main windings 13 or in the space between the main winding 13 and the wall of the stator slot 1 (in this case, a plurality of auxiliary magnet wires form a lump). Alternatively, only the space between the main winding 13 and the wall of the stator slot 1 may be used.

The main winding 13 and the auxiliary winding 15 housed in the stator slot 1 as described above are connected to, for example, a Y-connection of a parallel circuit as shown in FIG. FIG. 2 is a connection diagram in the case of two poles, and R1 is a resistance of one phase and one phase of the main winding 13, and R1 is
Reference numeral 2 denotes a resistance corresponding to one pole and one phase of the auxiliary winding 15. And
Since the main winding 13 and the auxiliary winding 15 are connected in parallel for each phase, the resistance value Ra for one phase is 2 × (R1 × R2) /
(R1 + R2). On the other hand, the conventional resistance value Rb for one phase is 2 × R1.

Here, the resistance of the main winding 13 (for one pole and one phase)
If R1 = 1Ω, the resistance (for one pole and one phase) R2 of the auxiliary winding 15 is inversely proportional to the square of the diameter ratio of the magnet wire, so that R2 = 1 × [(1000/154) / 1] ² = 42.4
Ω. Using the R1 = 1Ω and R2 = 42.2Ω, a conventional resistance value Rb for one phase is calculated as Rb = 2 × 1 = 2
Ω.

On the other hand, the resistance value Ra of one phase of the present embodiment is
Is obtained, Ra = 2 × (1 × 42.2) / (1 + 42.2) = 1.
95Ω, and the primary copper loss is about (1.95 / 2) × 1
00 = 97.6%.

As described above, since the conductor (auxiliary magnet wire) is inserted into the space which has been conventionally a gap by placing the auxiliary winding 15 between the main windings 13, the primary copper of the stator winding is formed. The heat generated by the loss is transmitted through the auxiliary winding 15 and heat transfer to the stator core is improved. Then, the motor temperature rise is reduced due to a synergistic effect that the motor efficiency is also improved by reducing the primary copper loss.

Next, a second embodiment will be described with reference to FIG. FIG. 3 is a connection diagram in the case of two poles. The difference from the first embodiment is that the auxiliary winding 25 has respective output terminals.
By connecting to the output terminal of the main winding 23, the same effect as in the first embodiment can be obtained. That is, in the figure, Mu, M
v and Mw are output terminals of the main winding 23, and Au, Av, and
Aw is a lead terminal of the auxiliary winding 25. When these output terminals Mu and Au, Mv and Av, and Mw and Aw are respectively connected, a two-pole connection diagram similar to that of FIG. 2 is formed, and the same operation and effect as those of the first embodiment are obtained. can get. Further, when only the output terminals Mu, Mv, Mw of the main winding 23 are connected to the power supply terminal, a motor characteristic different from that of the first embodiment can be obtained. Can be provided.

Next, a third embodiment will be described with reference to FIG. The third embodiment is an example in which the auxiliary winding 25 circuit is used as a space heater for preventing dew condensation inside an electric motor. In the drawing, the auxiliary magnet wire of the auxiliary winding 25 is 154/10 of the wire diameter of the main winding 23 magnet wire.
00 and R1 = 1Ω, then R2 = 42.2Ω. Here, the auxiliary winding 25 is subjected to single-phase current heating. The calculation formula for single-phase current heating is W = 2 × I ² R (R is one phase), and W is generally determined by the size of the motor, so that the single-phase current varies depending on the size of R. Become. Therefore, when heating the auxiliary winding 25 circuit with single-phase current, the main winding 23
Compared with the circuit, the current is reduced by the ratio of the square root of R1 / R2, and single-phase current heating can be performed at a low current. By heating the single-phase current in this way, the inside of the motor becomes warm, and it is possible to prevent dew condensation occurring due to the difference between inside air and outside air inside the motor while the motor is stopped. Has the effect of reducing the space heater action with a small current.

Next, a fourth embodiment will be described. The material of the auxiliary magnet wire forming the auxiliary winding 15 of the first embodiment is lower than the material of the magnet wire of the main winding 13. That is, aluminum (conductivity γ = 36) is used for the auxiliary magnet wire forming the auxiliary winding 15.
m / Ωmm ² ), and copper (conductivity γ = 58 m / Ωmm ² ) is used for the magnet wire of the main winding 13. Then, under the same conditions (R1 = 1Ω) as in the first embodiment, R
When R2 = 1, R2 = 1 × [(1000/154) / 1] ² × (36 /
58) = 26.2Ω, and the resistance value Rc for one phase in FIG. 2 is obtained. Rc = 2 × [(1 × 26.2) / (1 + 26.2)] =
1.92Ω. This can reduce the primary copper loss to about (1.93 / 2) × 100 = 96.3% with respect to the conventional 2Ω.
Other functions and effects are the same as those of the first embodiment.

In contrast to the above embodiment, the number of auxiliary magnet wires in the auxiliary winding may be doubled or tripled with respect to the number of magnet wires in the main winding. Will be better.

[0020]

As described above, according to the present invention, an electric motor having a three-phase armature winding in which a magnet wire is wound and housed in a stator slot in a random manner has a small primary copper loss and a high primary copper loss. It is possible to provide a motor having good characteristics with low efficiency temperature rise, and a three-phase motor capable of low-current single-phase heating and obtaining two types of characteristics.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a stator slot according to an embodiment of the present invention, in which a winding is accommodated in a stator slot;

FIG. 2 is a connection diagram of a main winding and an auxiliary winding showing one embodiment of the present invention;

FIG. 3 is a diagram corresponding to FIG. 2, showing another embodiment of the present invention;

FIG. 4 is a diagram corresponding to FIG.

FIG. 5 is a diagram corresponding to FIG. 2 of the related art.

[Explanation of symbols]

 1: stator slot, 13, 23: main winding, 15, 25: auxiliary winding.

Claims (5)

[Claims] 1. A three-phase armature winding in which a magnet wire is wound around a stator and housed in a stator slot.
The above-mentioned magnet wire is used as a main winding, and an auxiliary winding made of an auxiliary magnet wire having a diameter of 1/10 to 154/1000 is connected to the main winding in parallel with the main winding. A three-phase armature winding, which is disposed in a gap. 2. The three-phase armature winding according to claim 1, wherein connection terminals of respective circuits of the main winding and the auxiliary winding are brought out of the motor. 3. The three-phase armature winding according to claim 1, wherein the auxiliary winding is used as a space heater for single-phase current heating when the motor is stopped. 4. The three-phase armature winding according to claim 1, wherein the auxiliary winding is made of a material having a resistance different from that of the main winding. 5. The three-phase armature winding according to claim 1, wherein the resistance of the auxiliary winding is lower than that of the main winding.