Commutation process controlling device and method of permanent magnet brushless direct current motor through ship electric propulsion

Abstract

The present invention discloses a commutation process controlling device of a permanent magnet brushless direct current motor through ship electric propulsion. The device comprises a direct current voltage source, a three-phase full bridge inverter and six gate pole breakable thyristors. The three-phase full bridge inverter is formed by connecting six power tubes in series two by two and then connecting the six power tubes in parallel, the six power tubes and the six gate pole breakable thyristors are connected in parallel in a one-to-one correspondence mode, and the three-phase full bridge inverter is connected with the permanent magnet brushless direct current motor. The present invention further discloses a commutation process controlling method of a permanent magnet brushless direct current motor through ship electric propulsion. At the start time of the commutation process, a gate pole breakable thyristor connected in parallel with a power tube located in a turn-off state in the three-phase full bridge inverter are opened, and other five gate pole breakable thyristors are turned off. At the end time of the commutation process, all the gate pole breakable thyristors are turned off. According to the invention, the influences of the freewheeling impact voltage and the commutation torque ripple in the commutation process of the permanent magnet brushless direct current motor through ship electric propulsion can be effectively weakened, and the reliability and the speed regulation performance of the electric power propulsion system can be improved.

Description

technical field [0001] The invention belongs to the technical field of ship electric propulsion, and in particular relates to a process control device and control method for a phase commutation process of a permanent magnet brushless DC motor for ship electric propulsion. Background technique [0002] In recent years, permanent magnet brushless DC motors have been increasingly widely used in the field of ship electric propulsion due to their simple structure, high power density, and simple control. In the commutation process unique to the 120° turn-on of the permanent magnet brushless DC motor, due to the inductance effect of the motor winding, the phase current of the permanent magnet brushless DC motor turns off through the same phase current as the three-phase full-bridge inverter turns off the power tube. The freewheeling of the body diode of the power tube of the bridge arm will lead to a higher freewheeling impulse voltage. Especially for the ship electric propulsion ...

AI Technical Summary

Problems solved by technology

[0003] So far, there is little research on the control technology of the commutation process of permanent magnet brushless DC motors for marine electric propulsion, and the application technology of the present invention has not yet been reported.

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