JP3568410B2 - How to determine the number of turns of armature winding - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an armature winding number of turns discriminating method that rotary electric machine to determine the number of turns of an armature winding in a dynamoelectric machine.
[0002]
[Prior art]
FIG. 5 is a front sectional view showing a conventional rotating electric machine, and FIG. 6 is a side sectional view of the same.
In the figure, 11 is a shaft, 12 is a rotor fixed to the shaft 11, 13 is an armature, 14 is a front bracket, 15 is a rear bracket, both of which are connected to the shaft 11 via bearings 16 and 17. It is rotatably supported. Further, 13a is an armature core, 13b is a tooth formed on the armature core 13a, 13c is a slot formed between the teeth 13b, and 13d is shown in only one place in the figure, but is inserted into the slot 13c. The armature coil 18 is a gap.
[0003]
Next, the operation will be described. When the rotating electric machine operates as an electric motor, a current flows from the inverter (not shown) to the armature coil 13 d to generate a rotating magnetic field, thereby generating a rotating torque on the rotor 12 fixed to the shaft 11. I do. Further, when operating as a generator, when a rotational torque is input to the shaft 11, the rotor 12 fixed to the shaft 11 rotates, and the linkage magnetic flux acts on the armature coil 13d, thereby causing the armature coil 13d to operate. An electromotive force is generated in the coil 13d, and power is collected from an inverter (not shown).
[0004]
[Problems to be solved by the invention]
Since the conventional rotary electric machine is configured as described above, for windings with a large number of armature coils in parallel circuits, and for armatures manufactured by manual winding work where machine winding is not possible, errors in the number of windings May occur. The error in the number of turns could not be determined from the winding resistance value. That is, the resistance value of the coil has a difference of ± 5% because the total length is different between the slot insertion position of the coil, for example, the outer peripheral side and the inner peripheral side of the slot. Therefore, the number of turns cannot be accurately determined. As a result, there is a problem that imbalance of the internal electromotive force occurs during operation, a circulating current is generated in the armature coil, the temperature of the winding is increased, and the coil is burned.
[0005]
The present invention has been made in order to solve the above-described problems, and has been made to provide a highly reliable rotating electric machine by making it possible to determine the number of turns of an armature coil at the time of manufacturing an armature. Aim.
[0006]
[Means for Solving the Problems]
The method for determining the number of turns of an armature winding according to claim 1 of the present invention is characterized in that the self-inductance of the armature winding when the inner diameter of the armature is in an air-core state and the state in which a measurement iron core is inserted into the armature. The self-inductance of the armature winding is measured, and the number of turns of the armature winding is determined from the difference between the measured self-inductance in the air-core state and the self-inductance in each state in which the measurement iron core is inserted .
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are side sectional views showing an armature according to Embodiment 1 of the present invention. FIG. 1 shows an air core state, and FIG. 2 shows a state in which an iron core is inserted. In the drawing, 1 is an armature, 1a is an armature core, 1b is a tooth formed on the armature core 1a, 1c is a slot formed between the teeth 1b, and 1d is only one position in the figure. An armature coil 2 inserted in 1c is an iron core.
FIG. 3 is a diagram showing an outline of connection of armature windings of the rotary electric machine according to the present embodiment, and FIG. 4 is a diagram showing the connection of FIG. 3 in more detail including the armature core 1a.
[0008]
In the figure, the numbers in the lower part of the figure are slot numbers given for convenience. The U-phase coil is buried in the fourth slot to the first slot, the V-phase coil is buried in the sixth slot to the third slot, and the W-phase coil is buried in the second slot to the fifth slot. It is distributed and wound with the number of turns appropriate for the characteristics of the rotating electric machine. The coils of each phase are wound by constructing several coils of the same number of turns in parallel. FIG. 2 shows a state in which the measuring iron core 2 is inserted into the armature 1 and the magnetic circuit is closed from the state of the air core of FIG. The self-inductance is measured for each phase and each parallel coil.
[0009]
In the determination of the armature winding of the rotating electric machine of the present embodiment, the self-inductance of the coil 1d due to the leakage magnetic flux in the air-core state (FIG. 1) is determined for each parallel coil of each phase, and the measurement core 2 is connected to the armature 1 The number of turns can be determined by subtracting from the self-inductance in the state inserted into the inside (FIG. 2).
That is, since the self-inductance of the coil 1d is proportional to the square of the number of turns, it is possible to accurately determine the number of turns that could not be detected by measuring the resistance value.
[0010]
The above is described in detail using mathematical expressions. In general, if the self inductance is L, the number of turns is N, the magnetic resistance is R, and the influence of the leakage magnetic flux is φ, a relational expression of L = N ² / R + φ is derived . φ is a leakage magnetic flux generated in a portion of the coil end portion that is exposed from the armature iron core, and has substantially the same value when measuring L1 and L2. In the state of FIG. 1, L ₁ = N ² / R ₁ + φ (1), and in the state of FIG. 2, L ₂ = N ² / R ₂ + φ. Therefore, (2) - (1) from the ^{_{equation, L 2 -L 1 = N 2}} (1 / R 2 -1 / R 1) and Do Ri, phi is erased Runode,
[0011]
(Equation 1)
[0012]
, And the number of turns N is obtained.
[0013]
The measurement method described above, obtains the difference between L ₁ and L ₂ When becomes leakage flux has been erased, wherein measuring the self-inductance L _1, L ₂ of the coil by the presence or absence of the measurement core in the center of the armature core By doing so , it is possible to accurately determine the number of turns.
Although FIG. 3 illustrates the rotating electric machine of the three-phase Y-connection system, the same measurement can be performed for a rotating electric machine other than the rotating electric machine of this system.
[0014]
By doing as described above, the number of turns of the armature coil of the rotating electric machine can be accurately determined, so that the yield is improved, and a high-quality, low-cost rotating machine can be obtained.
[0015]
【The invention's effect】
According to the method for determining the number of turns of the armature winding according to the first aspect of the present invention, the self-inductance of the armature winding when the inner diameter portion of the armature core is empty and the measurement core inserted into the armature are inserted. The number of turns is determined by measuring the difference between the self-inductance of the armature winding and the self-inductance of the armature winding , so that the number of turns of the armature winding can be accurately determined.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an armature in an air-core state according to Embodiment 1 of the present invention.
FIG. 2 is a side sectional view showing the armature in a state where an iron core is inserted according to the first embodiment of the present invention.
FIG. 3 is a connection diagram showing connection of armature windings according to the first embodiment of the present invention.
FIG. 4 is a connection diagram showing connection of armature windings according to Embodiment 1 of the present invention;
FIG. 5 is a front sectional view showing a conventional rotating electric machine.
FIG. 6 is a side sectional view showing a conventional rotating electric machine.
[Explanation of symbols]
1 armature, 1c armature winding, 2 measurement core.

Claims (1)

The self-inductance of the armature winding when the inner diameter of the armature is in the air-core state and the self-inductance of the armature winding with the measurement core inserted in the armature are measured. A method for determining the number of turns of an armature winding, wherein the number of turns of the armature winding is determined from a difference between self-inductances in each state in which an iron core is inserted .

Images