JPH01283036A - Stator of dc machine - Google Patents

Abstract

PURPOSE:To enable automatic regulation of leakage commutating flux through a DC machine body, by providing a pole chip protrusion on the pole chip of a main pole core at a position facing with a shortcircuit core and providing a leakage regulation winding to the pole chip protrusion. CONSTITUTION:A main pole 2 provides main flux to the armature winding 7 of an armature 6 rotatable in a stator. A commutating pole 3 provides commutating flux for producing commutation electromotive force when the current flowing through the armature winding 7 is converted. A core 10 for shortcircuiting the side face close to the armature 6 of the commutating pole core 8 and the side face of a pole chip 4A is arranged between the main pole 2 and the commutating pole 3. Furthermore, pole chip protrusions 12A, 12B are provided to the pole chip 4A of the main pole core 4 and a leakage regulation winding 11 is provided to a pole chip protrusion 12A arranged on the pole chip 4A of the main pole 2 having same polarity as the commutating pole 2. The direction of the magnetromotive force is set to be contrary to the magnetromotive force of the commutating pole winding 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a DC machine, and more particularly to a stator of a DC machine suitable for compensating for the phenomenon of no-spark zone movement for one rotational speed.

[Conventional technology]

DC machines have long had a phenomenon in which the non-sparking band moves to the proper flow side as the rotational speed increases, and as a countermeasure to this phenomenon, (1) the interpolation shunt current is changed to 0 rotational speed. (2) Adjusting the magnetic flux by using a separate power supply is used.However, these methods are expensive because they add a bag opening to the main body of the DC machine. Therefore, as a countermeasure for using only the DC machine itself, JP-A-62-7
Japanese Patent No. 1463 proposes a DC machine shown in FIGS. 9 and 10.

Figure 9 shows an exploded view of the main parts of the DC machine. A main pole 2 and a complementary pole 3 are provided on the inner periphery of the yoke 1. The main pole 2 is formed by a main pole iron core 4, a magnetic pole piece 4A, and a field winding 5, and provides main magnetic flux to the armature winding 7 of an armature 6 rotating inside the stator, and the commutating pole 3 is a commutating pole. It is formed from an iron core 8 and a commutator winding 9, and serves to provide a commutator magnetic flux for generating a rectified electromotive force during a rectification phenomenon in which the '1 current flowing through the armature winding 7 is reversed.

Additionally, an armature 6 of the commutator core 8 is disposed between the main pole 2 and the commutator pole 3.
A short-circuit core 10 (IOA, 10B) is provided to short-circuit the side surface near the side and the side surface of the magnetic pole piece 4A.

The operation of this configuration during low-speed operation and high-speed operation is shown in FIG. The same figure (#1) shows the time of low-speed operation, and (b) shows the time of high-speed operation, and φMP
(φMP1+ φMP2) is the main magnetic flux, φ■1・(φI
PI~φII'3) is the interpolation magnetic flux. During low-speed operation in (a), the field is strong, so the main magnetic flux φMPI becomes large, and the magnetic flux density between the main pole core 4 and the yoke 1 increases, resulting in a magnetically saturated state and leakage through the short-circuit core 10B. The leakage commutating magnetic flux is only φI)・1, and the remaining φIP
2. φlP3 becomes a commutating magnetic flux that enters the armature 6 side and generates a rectified electromotive force.

During high-speed operation (b), since the field is weakened, the main magnetic flux φ
Since MP2 becomes small and the magnetic flux density between the main pole iron core 4 and the yoke 1 is low and the state is not magnetically saturated, the short-circuited iron core 1
The commutating magnetic flux φTP tends to leak to the main pole iron core 4 through 0B, the commutating magnetic flux φlP1+2 becomes the leaking commutating flux to the main pole iron 4, and φN'3 enters the armature 6.

In this way, the amount of magnetic flux incident on the armature 6 is smaller during high-speed operation than during low-speed operation, so the movement of the no-spark zone can be prevented.

[Problem to be solved by the invention]

The above conventional technology does not have an external adjustment function for the leakage magnetic flux of the magnetic pole through the short-circuited iron core to adjust the magnetic flux of the magnetic pole incident on the armature. The amount of leakage magnetic flux of the commutator that passes through the short-circuited iron core is determined only by the constant of the magnetic circuit made of iron, and it is difficult to adjust the amount of leakage magnetic flux of the interpole linked to the rotation speed within the field control range. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a DC machine that can automatically adjust leakage interpolation magnetic flux in the main body of the DC machine and prevent the no-spark zone movement phenomenon.

[Means to solve the problem]

The above object is to provide a magnetic pole piece convex portion on the magnetic pole piece of the main pole core through an air gap at a position facing the short-circuit core, and provide a leakage adjustment winding on the magnetic pole piece convex portion having the same polarity as the commutating pole core, and This is achieved by connecting it in parallel with the field winding.

[Effect]

The leakage adjustment winding installed on the convex part of the magnetic pole piece of the main pole iron works to increase the magnetic resistance of the short-circuited iron during low-speed operation and to reduce it during high-speed operation. The amount of leakage magnetic flux of the commutator through the short-circuited core installed between the pole cores is small during low-speed operation, and increases during high-speed retraction, and the magnetic flux (rectified electromotive force ) can be reduced during high-speed operation than during low-speed operation, and the no-spark zone movement phenomenon can be prevented.

The absolute value of the amount of leakage magnetic flux can be easily adjusted by adjusting the current division ratio of the leakage adjustment winding.

〔Example〕

Embodiments of the invention are shown in FIGS. 1-8.

FIG. 1 is a developed view of the main parts of the present invention, showing a short-circuit core 10A and an IOB near the armature 6 side of the commutating pole core 8, and a pole piece convex portion 12A on the pole piece 4A of the main pole core 4.

12B, and a gap Sg is provided between the short-circuit core 10A and the pole piece protrusion 12A, and between the short-circuit core 10B and the pole piece protrusion 12B. A leakage adjusting winding 11 is provided on the pole piece convex portion 12A provided on the magnetic pole piece 4A of the main pole 2 having the same polarity as the commutating pole 2, and the direction of the magnetomotive force thereof is set to be opposite to the magnetomotive force of the commutating pole winding 9. It is set.

FIG. 2 is a connection circuit diagram of the DC machine, in which a leak adjustment winding 11 is provided in parallel with the field winding 5.

With such a configuration, operations during low-speed operation and high-speed operation will be explained based on FIG. 3. During low-speed operation in Figure (a), the field is strong (the field current is large), so the leakage yA regular winding 1
1 also has a large magnetomotive force.

The commutating magnetic flux φIPI~φ passing through the commutating iron core 8 due to the auxiliary winding 9
Of the IP3, the leakage commutator magnetic flux leaking to the magnetic pole piece 4A of the main pole 2 is caused by the short-circuited iron core 10 provided between the different poles of the main pole 2 and the commutator pole 3.
B, only φIPI passes through the pole piece convex portion 12B,
The remaining φ1P2t φIP3 enters the armature 6 side and becomes a supplementary ti magnetic flux for generating a rectified electromotive force.

On the other hand, during high-speed operation in (b), the field is weakened (the field current is small), so the magnetomotive force of the leakage adjustment winding 11 is also small, so that the leakage commutating magnetic flux φIPI is reduced to the short-circuited iron core 10B.
and the magnetic pole piece convex portion 12B, and the leakage commutating magnetic flux φ
IP3 leaks to the main pole iron core 4 via the short-circuited iron core 1, OA and the pole piece convex portion 12A, and the remaining φIP3 enters the armature 6 side and becomes interpolation magnetic flux to generate a rectified electromotive force.

Therefore, it is clear that the amount of leakage interpole magnetic flux φIPI during low-speed operation and the amount of leakage interpole magnetic flux (φIP1+φIP3) during high-speed operation are φrp! <'(φIPI+φIP3), conversely,
During low-speed operation, the amount of commutating magnetic flux for generating rectified electromotive force incident on the armature 6 side from the commutating pole iron core 8 is (φIP2+φ
+pa), during high-speed operation, it is clear at φIP12 (φI
PZ+φIP3) >φIP2 roars. Due to this.

Since the amount of interpole magnetic flux during high-speed operation is smaller than during low-speed operation, the no-spark band movement phenomenon can be prevented using only the DC machine main body.

The purpose of the air gap Sg provided between the short end core and the pole piece convex portion is to obtain linearity of the interpole magnetic flux (with respect to the load current).

At this time, by changing the rotation speed (by changing the field strength (ii flow)), the leakage copole magnetic flux amount can be adjusted automatically by changing the magnetomotive force of the leakage adjustment winding 11 installed in parallel with the field winding 5. Since it changes to
It can be automatically linked to the rotation speed and changed without any modification, and by adjusting the absolute amount (required magnetomotive force), the optimum rectification state is always maintained within the field control range. You can get a DC machine that can.

In the case of a DC machine that is operated in both rotational directions by reversing the direction of the armature current IM, the polarity of the commutating pole 2 is also reversed, so it is necessary to configure the machine accordingly.

FIG. 4 shows another embodiment of the present invention intended for a DC machine operated in both directions of rotation, in which the leakage adjustment windings in FIG. As shown in FIG. 5, one of the leakage adjusting windings is selected depending on the direction of rotation.

In FIG. 4, if the polarities of the main pole 2 and the counter pole 3 and the current direction of the armature winding 7 are set as shown, the rotation direction of the armature 6 will be in the right direction. At this time, if the leakage adjusting winding 11A is selected by the switch 13 shown in FIG. 5, the amount of leakage commutating magnetic flux can be adjusted as in FIG. 3. When the current direction of the armature winding 7 is switched and the rotation direction of the armature 6 is reversed, the polarity of the commutative pole 3 is also reversed, so when the leakage adjustment winding 11B is selected by the switch 13, the commutative pole 3 becomes the S pole. Since the magnetomotive forces are in opposite directions, the amount of interpolation magnetic flux can be adjusted using only the DC machine body.

Figure 6 shows another embodiment of the present invention for a DC machine operated in both rotational directions, in which the leakage adjustment windings in Figure 1 are provided on the convex portions of the pole pieces on both sides of the main pole core. It is something.

In FIG. 6, the magnetomotive forces of the leakage adjustment windings 11A and IIB are set in a direction that short-circuits the north and south poles of the main pole 2. In the case of a strong field, the magnetomotive force of the leakage adjustment winding 11B is strong and acts in the direction of leaking the copolarity magnetic flux to the main pole core 4, but the short-circuit core 10B and the pole piece convex portion 12B are connected to the field winding 5 and the commutator. Since magnetic saturation is caused by the leakage commutative flux due to the magnetomotive force with the winding 9, there is almost no increase in the leakage commutator flux due to the leakage adjustment winding 11B. The direction of the magnetomotive force of the leakage adjusting winding 11A is opposite to the direction of the magnetomotive force of the first auxiliary winding 9, as shown in FIG. This can prevent leakage to the main pole iron core 4 of the same polarity.

On the other hand, in the case of field weakening, the magnetomotive force of the leakage adjustment winding 11 becomes smaller, so that the short-circuited iron core 10B.

The amount of leakage interpole magnetic flux leaking to the main pole iron core 4 via the pole piece convex portion 12B remains almost unchanged, and the amount of leakage interpole magnetic flux leaking to the main pole iron core 4 via the short-circuited iron core 10A and the pole piece convex portion 12A remains unchanged. To increase.

As a result, the amount of interpolation magnetic flux during high-speed operation (weak field) is smaller than during low-speed operation (stronger field), so the no-spark zone movement phenomenon can be prevented only by the DC machine main body.

In addition, when switching the current direction of the armature winding to reverse the rotation direction (this method of switching the rotation direction is mainstream), the polarity of the commutative pole 3 is also reversed and becomes the S pole, but the leakage adjustment winding As a result of the magnetomotive force direction of 11B being opposite to the magnetomotive force direction of the commutator winding 9, regardless of the direction of one rotation, the amount of commutator magnetic flux can be adjusted only by the DC machine main body without changing the current direction of the leakage adjustment winding.

FIG. 8 shows another embodiment of the present invention, showing the mounting positions of the magnetic pole piece convex portion and the leakage adjustment winding.

In FIG. 8, magnetic pole piece convex portions 12A and 12B are provided in the magnetic pole piece 4A of the main pole iron core 4, and the leakage adjustment winding 11 is attached to the magnetic pole piece convex portion 12 by a stopper 14 (14A).

14B) is fixed. As a result, the magnetic pole piece 4
The air gap between A and the pole piece convex portion 12 and the short-circuited iron core 10 becomes Sg, and the commutating pole 3 can be removed in the radial direction, thereby improving assembly workability.

In this way, according to this embodiment, the no-spark band movement phenomenon can be prevented only by the DC machine main body. In addition, since it is a simple groove structure that only includes a short-circuit core and a pole piece convex part, and a leakage adjustment winding on the pole piece convex part, it does not require any other compensation equipment, and it is inexpensive because there is no installation or wiring work. Yes, and requires less installation space.

Although the leak adjustment winding is provided in parallel with the field winding in this embodiment, it may be excited by a separate power source.

〔Effect of the invention〕

According to the present invention, leakage of the interpole magnetic flux from the interpole iron to the main pole iron can be adjusted, and the amount of interpolation magnetic flux can be automatically adjusted in the DC machine body, so that the non-spark zone movement phenomenon can be prevented. You can get a DC machine.

[Brief explanation of the drawing]

Figure 1 is an exploded view of the main parts of a DC machine according to an embodiment of the present invention;
The figure is a circuit diagram showing a state in which the leakage adjustment winding shown in Figure 1 is installed.
FIGS. 3(a) and 3(b) are also explanatory diagrams of the operation of one embodiment,
(a) is a developed view of the main parts of a DC machine showing operation during low-speed operation, (b) is a developed view of the main parts of a DC machine showing operation during high-speed operation, FIG. 4 is a developed view of the main parts of a DC machine according to another embodiment of the present invention, and FIG. is a circuit diagram showing a state in which the leakage adjustment winding shown in FIG. 4 is installed, FIG. FIG. 8 is an exploded view of a DC machine stator showing how the leakage adjustment winding of the present invention is installed. FIG. 9 is an exploded view of the main parts of a conventional DC machine. Figure 10 (a), (b)
(a) is an exploded view of the main parts of the DC machine showing the operation at low speed operation and (b) at high speed operation. 1... Yoke, 2... Main pole, 3... Complementary pole, 4...
Main pole iron core, 4A...Magnetic pole piece, 5...Field winding, 6.
...Armature, 7...Armature winding, 8...Commuting pole iron core,
9... Commuting pole winding, 10... Short-circuit core, 11... Leakage adjustment winding, 12... Magnetic pole piece convex portion, 13... Changeover switch, 14... Stopper. Agent Patent Attorney Katsuo Ogawa (≦゛1st country ξJ≦ and ＝＼−, /

Claims (1)

[Claims] 1. On the inner peripheral side of an annular yoke between an armature of a rotor and a plurality of main poles arranged opposite to the rotor and consisting of a main pole iron core and a field winding. The armature side of both of these is short-circuited between the main pole iron core and the commutative pole iron core, and the leakage of the interpolation magnetic flux is prevented. In a stator of a DC machine, a convex portion is provided on the magnetic pole piece of the main pole iron at a position facing the short circuit iron core through a gap, and a convex portion is provided on the magnetic pole piece of the main pole iron, and a convex portion is provided on the magnetic pole piece of the main pole iron at a position facing the short circuit iron core, and a convex portion is provided on the magnetic pole piece of the main pole iron, and A stator for a DC machine, characterized in that a leakage adjusting winding is wound around a convex portion of the main pole core to adjust the leakage commutator magnetic flux leaking from the commutator core to the main pole core. 2. The leakage adjustment winding is provided on the pole piece convex portions on both sides of the main pole core, and one of the leakage adjustment windings is selected depending on the rotational direction of the rotor. A stator for a DC machine according to claim 1. 3. A stator for a DC machine according to claim 1, wherein the leakage adjustment winding is provided in parallel with the field winding. 4. The leakage adjustment windings are provided on the pole piece convex portions on both sides of the main pole core, and current is supplied in a direction that generates a leaky interpolation magnetic flux that short-circuits between the main pole cores. A stator for a DC machine according to claim 1, characterized in that: