SU1764006A1 - Direct-current motor armature winding equalizing connections period determining method - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control the windings of the core with equalizing connections. The purpose of the invention is to increase credibility. For this purpose, a DC current is applied to the core winding through the collector plate located at the pole pole division distance. The voltage drop between the two nearest collector plates of one winding stroke, located at the distance of the calculated step of equalizing joints from one of the plates through which the current is applied, is measured. Moving along the collector successively, the plate is found, the voltage drops between which and the plates to the right and left of it have different signs. Measured successively voltage drops between found 135 | SL

Description

v |

Os 4

Oh oh

ON

wrong tf / joxetfwt / uraymitlsb

plate and plates through which the effect of current is carried out, and the step of equalizing joints is determined by the distance nz collector between the plate 27 found (29) and plate 85 (87) through which effect a direct current and having the lowest

The invention relates to electrical engineering and can be used to control the windings of the core with equalizing connections of DC electric machines.

A known method for determining the pitch of equalization connections in the winding of the core of electric machines of direct current includes the effect on the winding of the core of direct current, measuring the voltage drop between the collector plates and making a judgment about the correctness of the winding.

The closest to the invention is a method for determining the step of equalizing connections in the winding of the core of electric machines of direct current, including the impact on the winding of the core of direct current, measuring the voltage drops between the collector plates at the distance of the step of equalizing connections across the collector and making a judgment about the point of attachment of equalization connections.

The disadvantage of this method is low reliability, since the voltage drops between the plates, to which equalizing connections are connected, differ from the voltage drops between the plates without equalizing connections. Only a few percent, that with the existing technological spread of windings and equalizing resistance values with the required accuracy, determine the step of the equalization connections and the places of their connection.

The purpose of the invention is to increase the reliability of determining the step of equalizing joints.

The goal is achieved by the fact that in the method of determining the pitch of equalizing connections in the winding of the core of electric machines of direct current, including the effect on the measles of direct current, the voltage drop relative to the found plate. Replacing the operation of measuring the voltage drop to the operation of fixing the change of the voltage sign increases the reliability of the control and simplifies the process of determining the step of equalizing joints. 1 ill., 1 tab.

The voltage drop between the collector plates and their analysis, the action of direct current on the measles is carried out through the collector plate located at the pole division distance, the voltage drops between the two nearest collector plates of one winding stroke located at the equalizing step of equalizing

compounds from one of the plates through which current is being applied to measles, moving the collector sequentially, finding the plate, the voltage drops between which and the plates to the left and right of it have different signs, measuring successively the voltage drops between the found plate and plates, through which a direct current is applied, and the step of equalizing joints is determined by the distance at the collector between the plate found and the plate, through which the constant nym having the smallest current and the voltage drop with respect to the same audio found plate.

The drawing shows the unfolded circuit of the one-way loop winding of the core, on which the collector plates 1-3, .... 17-2984-86115-119133-145

200-202231-232, are interconnected horizontally by sections of the winding of the core, and vertically by equalizing connections. The electrodes 233 and 234 of the current source 235 are set at a distance of

pole division of each other.

The method is carried out as follows.

A current source 235 is applied by direct current to the winding of the core through

collector plates 27 and 85 located at the pole distance from each other. A voltmeter 236 measures a voltage drop between two adjacent, as the winding is single pass, collector plates located approximately

at a distance of the calculated step of the equalization joints from the plate 27.

The direction of the currents hIs in the elements

windings indicated by arrows. It can be seen from the diagram that the interlaminal voltage to the left and to the right relative to the plate 143, which is connected. equalizing connection with the plate 27, has different signs.

As an example, we can consider the experience of determining the pitch of equalization compounds in the core of the ED-132 traction motor. The winding of the core is simple loopback, the number of poles is 2p 4, the number of slots of the core is z 58, the number of collector plates is 232, the number of equalizers is 58. The calculated pitch of equalizing connections is Yy 116. The resistivity of one section is 1.02 mΩ, of one equalizer 1.3 mΩ.

During engine tests, the measles does not develop a torque and rotates at a frequency 10 times lower than the calculated one. When measuring, it turned out that the resistance of the winding core is 43% of the calculated value. The correctness of the equalization connections of the core winding has been verified.

The measurement results made in accordance with the proposed method are shown in the table.

The fact that the voltage drops between the plates 134 and 135 on the one hand and between the plates 135 and 136 with the other have different signs indicates that a balancing connection is connected to the plate 135. And the fact that the voltage drop between the plates 27 and 135 (V 5 mV) is many times smaller than between the plates 85 and 135 (V 1265 mV) means that the other end of the equalization joint is connected to the collector plate 27.

Thus, it was found that in the bark, equalizing connections were made with an erroneous step 108 instead of the calculated 116. This was confirmed when the winding was disassembled.

When electrodes are mounted on plates 28 and 86, there is no abrupt transition from positive values of the voltage drop between the plates to negative.

As can be seen from the table, in this case the voltage drop between the plates 135 and 136, 136 and 137 is close to zero, and it is impossible to determine the exact location of the soldering of the equalization joint. This is explained by the fact that the equalizer joints are not soldered to the plates 28 and 86. Therefore, the measurements need to be repeated by placing the electrodes on the plates 27 and 85 or 29 and 87.

This method allows determining the attachment points of equalizing joints and their pitch with high confidence. This method is simpler than the well-known one, since when using it, a single instrument is enough - a voltmeter of a low accuracy class and no resistance is required.

Claims (1)

The invention The method for determining the pitch of equalization connections in the winding of a DC electric machine, including the effect on the DC current, the measurement of the voltage drops between the collector plates and their analysis, with the aim of increasing the reliability direct current to the measles is carried out through the collector plate located at the distance of the pole division; voltages between two nearest collector plates of one winding stroke, located at a distance of the calculated step of equalizing joints from one of the plates through which current is applied to the measles, moving across the collector successively, find the plate, and the voltage drops between it and the plates to the left and to the right of it have different signs, measure successively the voltage drops between the plate found and the plates, through which the action of direct current is effected, and the step is equalized nyh compounds is determined by the distance at a collector between the plate found and the plate through which a direct current is applied and having the smallest voltage drop relative to the plate found. Voltage drop between collector plates, mV