Multi-winding motor temperature rise test system and its control method

Abstract

The invention discloses a multi-winding motor temperature rise test system and a control method thereof. The system comprises: a multi-winding motor including more than two sets of armature windings; more than two sets of frequency conversion test power supplies corresponding to the number of windings of the multi-winding motor The frequency conversion test power supply drives the corresponding armature windings respectively, so that one or several sets of the armature windings operate in the electric state, and the other one or several sets of the armature windings operate in the power generation state; the switchgear is set in the frequency conversion Between the test power supply and the grid, it is used for the isolation between the frequency conversion test power supply and the grid, and to protect the temperature rise test system. The invention can carry out single-unit temperature-rise test on different types of double-winding motors, avoids cumbersome two-motor coupling and assembly tooling, reduces test supporting devices, reduces related losses, and saves most of the time and cost.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a device and a control method for temperature rise tests of multi-winding motors. Background technique [0002] As the most mature and widely used polyphase motor in engineering applications, the double-winding motor is composed of two sets of three-phase symmetrical armature windings, which are placed at a certain angle in the space of the motor stator. At present, the widely used double-winding motor usually adopts a six-phase double Y-shifted 30° winding structure. In fact, it is two sets of three-phase symmetrical armature windings, which are placed at an electrical angle of 30° apart in the space of the motor stator. as attached figure 1 As shown in , A, B, C represent the first set of three-phase armature windings, and R, S, T represent the second set of three-phase armature windings that are 30° behind in space. The two sets of windings are respectively composed of t...

AI Technical Summary

Problems solved by technology

[0009] In the traditional double-winding motor temperature rise test method, a test motor 9 with matching power needs to be selected for each test and connected to it through a coupling 13, which is time-consuming and laborious to install, with low flexibility and low test efficiency.

At the same time, the traditional temperature rise test method requires two full-capacity incoming switch cabinets, three sets of test power supplies and a large number of connecting cables, which greatly increases the test equipment and cost.

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