Abstract
In recent years, electric propulsion systems have become widely, used and these systems have strict limits in volume and weight. Therefore, it is necessary to reduce the weight of the inverter-motor drive system. In a typical n inverter-motor drive system, at least 2n phase current sensors are required. In order to reduce the number of phase current sensors, this paper proposes a method for measuring phase current using n DC link current sensors in a 2n inverter-motor drive system. Two phase currents per inverter-motor system are measured during one period of the switching frequency using the pulse width modulation (PWM) shift method. However, since the measured phase current contains an error component in the average current, the error component was compensated for in order to obtain a current similar to the actual phase current by using the slope and dwell time of the phase current. The effectiveness of the proposed method is verified through experiments.
Highlights
Conventional fuel-powered transportation has been facing major regulations due to environmental problems
The transport industry is currently undergoing a transition toward electric-based transportation, such as electric vehicles, ship propulsion, and aircraft systems
Using several motors in the propulsion system increases the efficiency of the system [1,2,3,4,5,6,7,8,9,10,11]
Summary
Conventional fuel-powered transportation has been facing major regulations due to environmental problems. For this reason, the transport industry is currently undergoing a transition toward electric-based transportation, such as electric vehicles, ship propulsion, and aircraft systems. Using several motors in the propulsion system increases the efficiency of the system [1,2,3,4,5,6,7,8,9,10,11]. For vector control of motors, three-phase current information is required. A minimum of two current sensors are required in order to obtain a three-phase current, and an additional DC link current sensor is required to protect against overcurrent
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