Abstract
In electric motors, the use of rare-earth magnets has been increasing rapidly. A stronger magnet force of the magnet enables the motor’s higher performance, resulting in the most high-performance motors generally using rare-earth magnets. However, these magnets have two crucial disadvantages: the potential restrictions on the supply of rare-earth magnetic materials and the sharp fluctuation in price. Thus, many recent researches focus on developing high-performance electric motors and reducing the use of critical rare-earth magnets. By increasing the torque density of the motor, we can reduce the use of permanent magnets. Focusing on this point, and we presented a double half permanent magnet (DHPM)-type vernier motor. This paper proposed a new saddle coil permanent magnet vernier motor with improved performance compared to its predecessor. The main feature of the proposed motor is that the permanent magnet and coil in the stator of a DHPM-type vernier motor is replaced by salient poles and saddle coils, respectively. We also investigate its characteristics through various simulations.
Highlights
This paper proposes a new double half permanent magnet (DHPM) vernier motor prepared by replacing the permanent magnet (PM) on the stator of a conventional DHPM-type vernier motor, employing salient poles and substituting a saddle coil
We analyzed the various features of the proposed DHPM vernier motor using precise simulations
The analysis results demonstrate that the induced voltage is almost equal to that of the DHPM-type vernier motor prepared by adding PMs to electromagnets
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. We already studied the design with PMs on both the rotor and stator sides and presented a double half permanent magnet (DHPM)-type vernier motor that has a high power density among the other vernier motors [11]. In a previous study [11], we presented the research results that can decrease the number of permanent magnets required in the motor by improving the torque characteristics using a DH vernier motor as a direct-drive system. This paper focuses on this point and further improved the torque performance and energy density It presents a new DHPM vernier motor in which the permanent magnet on the stator is replaced by a salient pole and a saddle coil.
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