Abstract
Electric scooters also known as electric motorcycle are viable and personal means of road transportation have been making their ways into the world markets now because in them, combustion engine with the use of fuel oil for propulsion have been completely eliminated for economic and environmental imperatives. Electric motor which converts electrical energy into mechanical energy is used to overcome the complication of combustion engine. As it is, everyone is opting for combustion engine free and fuel-less type of vehicle. For this reason, manufacturers have exhibited interest, making research on electric motor very attractive. Meanwhile, surface permanent magnet synchronous motor (SPMSM) has been successfully developed having output torque of 110 Nm, the assembly of motor lacked mechanical strength between the rotor yoke and the mounted permanent magnet (PM) which heats up during speed operation, resulting to poor performance. To overcome the challenges laced with SPMSM, this paper presents a novel design of 24 stator 14 pole outer rotor-permanent magnet flux switching motor (SOR-PMFSM) capable of high torque and high performance. It employs an unconventional segmented rotor which has short flux path flow. It also embraces alternate stator tooth windings to reduce material cost. Design specifications and restriction with input DC current are the same with SPMSM. The 2D-FEA by JMAG, version 14 is used to examine the performance of the proposed motor in terms of cogging torque, back-emf, average torque, power and efficiency. Preliminary results showed that torque, power output and efficiency of the proposed motor are 1.9Nm times, 5.8kW times more than SPMSM and efficiency of 84% thus, can sustain acceleration for long distance travel.
Highlights
For more than a century combustion engine (CE) vehicles which include conventional motorcycles or scooters have used fuel oil to create energy for propulsion for road transportation [1,2]
Results are presented in figures, graphs that make the reader to follow through the process
Coil test was conducted on the proposed motor to properly set the correct position of each armature coil phase so as to confirm the operating principle of SOR-PMFSM
Summary
For more than a century combustion engine (CE) vehicles which include conventional motorcycles or scooters have used fuel oil to create energy for propulsion for road transportation [1,2]. For PMSM, especially IPMSM, has the advantage of high torque density and power density, its design tends is very difficult as permanent magnet (PM) is inserted inside the rotor with assembly lacking mechanical strength degrading the performance of motor for driving system [14,15] While each of these electric motors has assisted in reducing fuel oil intake, emission of hazardous gas remains worrisome [16,17]. Surface mounted permanent magnet synchronous motor (SPMSM) [18,19] has been developed that has completely eliminated CE and the use of fuel oil from HES, pure electric scooter vehicle (ESV) in the following scooters: Kingday electric scooters, Aima electric scooters, Mobility electric scooter and Terra motors with operating ranges between 35-60 km/hr and power output of 3kW-5kW respectively. To overcome the problems of SPMSM and its limitations, segmented outer rotor permanent magnet flux switching motor (SOR-PMFSM) for high torque electric scooter propulsion is presented
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