A dynamic configuration circuit and control method for delta-star connection of motor windings

Abstract

The invention discloses a motor winding triangular star-shaped connection dynamic configuration circuit and a control method. The motor winding triangular star-shaped connection dynamic configurationcircuit comprises a winding triangular star-shaped connection configuration module, the winding triangular star-shaped connection configuration module comprises a triangular star-shaped connection configuration winding and multiple two-way thyristors, the winding triangular star-shaped connection configuration module is used for adjusting the triangular star-shaped connection configuration windingthrough switch on or switch off of the two-way thyristors according to motor rotation speed, when the motor rotation speed is larger than a first threshold value, the triangular star-shaped connection configuration winding is adjusted into star-shaped connection, when the motor rotation speed is smaller than a second threshold value, the triangular star-shaped connection configuration winding isadjusted into triangular connection, and the second threshold value is larger than the first threshold value. By using an electronic electrical device like the two-way thyristors, a reliable winding dynamic configuration circuit is built, and thus current can be reliably followed in the winding dynamic configuration process.

Description

technical field [0001] The invention belongs to the field of power electronics, and more specifically relates to a dynamic configuration circuit and control method for a delta-star connection of motor windings. Background technique [0002] The permanent magnet synchronous motor relies on permanent magnet excitation, which saves the excitation winding structure and excitation loss on the rotor. Therefore, the permanent magnet synchronous motor has high power density and high power factor, and has been widely used in vehicle drive motors. Due to the complex driving conditions of new energy vehicles and large fluctuations in vehicle speed, this requires the vehicle drive motor to have a wide range of speed regulation and high efficiency under a wide range of working conditions. However, due to the permanent magnet excitation, the excitation magnetic potential is difficult to adjust, resulting in high no-load back EMF of the motor at high speed, which greatly affects the contro...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above defects or improvement needs of the prior art, the present invention provides a dynamic configuration circuit and control method for the delta star connection of motor windings, thereby solving the problems of winding current interruption, motor torque sudden drop, and speed fluctuation in the prior art. , large impact on motors and new energy vehicles, large contactor size, slow response speed, arcing phenomenon when the contactor is disconnected from the winding, loud noise, and large technical problems of electromagnetic interference

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