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

Abstract

The invention discloses a multi-winding motor temperature-rise test system and a control method thereof. The system comprises a multi-winding motor with more than two sets of armature windings, more than two sets of variable-frequency test power supplies, and a switch cabinet. The variable-frequency test power supplies and the armature windings are matched in number. The armature windings are respectively driven by the corresponding variable-frequency test power supplies in such a manner that one or several armature windings are driven to run in the motoring state while one or several other armature windings are driven to run in the power-generating state. The switch cabinet is arranged between the variable-frequency test power supplies and the power grid and is used for isolating the variable-frequency test power supplies from the power grid and protecting the temperature-rise test system. According to the invention, the single-unit temperature-rise test on dual-winding motors of different models is enabled. Therefore, the adoption of complicated coupling and pairing tools for two motors is avoided. Meanwhile, the number of test matching devices is reduced. At the same time, the related loss is reduced. Most time and most cost are saved.

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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