Phase commutation process control apparatus and method for marine high-power brushless direct current motor apparatus

Abstract

The invention discloses a phase commutation process control apparatus for a marine high-power brushless direct current motor apparatus. The phase commutation process control apparatus comprises a direct current voltage source and a three-phase full-bridge inverter; the direct current voltage source supplies power to the three-phase full-bridge inverter; the three-phase full-bridge inverter is composed of six power tubes that are connected in a mode that every two power tubes are connected in series, and then the series-wound power tubes are connected in parallel; and the three-phase full-bridge inverter is connected with a brushless direct current motor. The invention also discloses a phase commutation process control method for the marine high-power brushless direct current motor apparatus; the control method comprises the steps of determining a to-be-turned-off phase of the brushless direct current motor and a to-be-turned-off power tube of the three-phase full-bridge inverter; detecting the phase commutation follow current on a power tube on the same bridge as the to-be-turned-off power tube of the three-phase full-bridge inverter, if the phase commutation follow current is not zero, continuing to open the to-be-turned-off power tube; and if the phase commutation follow current is zero, turning off the to-be-turned-off power tube. According to the phase commutation process control apparatus and method for the marine high-power brushless direct current motor apparatus, the influences of follow current impact voltage and phase commutation torque pulsation in the phase commutation process of the brushless direct current motor can be effectively weakened, and the reliability and the speed regulation performance of the electric power propelling system are improved.

Description

technical field [0001] The invention belongs to the technical field of ship electric propulsion, and in particular relates to a commutation process control device and control method of a high-power brushless DC motor device for ships. Background technique [0002] In recent years, due to its simple structure, high power density, simple control and many other advantages, brushless DC motors have been increasingly widely used in the field of ship electric propulsion. In the commutation process unique to the 120° conduction of the brushless DC motor, due to the inductance effect of the motor winding, the phase current of the brushless DC motor is turned off through the power tube of the same bridge arm as the three-phase full-bridge inverter. The freewheeling of the body diode will lead to a higher freewheeling impulse voltage, especially for the ship electric propulsion system, the brushless DC motor operates under high voltage and high current conditions, and this freewheelin...

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Problems solved by technology

[0003] Up to now, there are very few studies on the commutation process control technology of marine high-power brushless DC motor devices, and the application technology of the present invention has not yet been reported.

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