Abstract
This paper proposes a low-cost dual-mechanical-port dual-excitation machine for washing machine application. The proposed machine artfully combines two machines (vernier and permanent magnet synchronous machine (PMSM)). An outer vernier rotor is used for the low-speed washing operations, and an inner PMSM rotor is used for the high-speed drying operations of the washing machine. The proposed machine is compared with a similar recently presented machine to verify its cost-effectiveness. Comparison using the finite element analysis (FEA) shows that the ferrite magnets used in the proposed topology are more cost-effective. Furthermore, compared to the existing machine, the power factor of the proposed machine is high during the drying operation; hence, a lower rating inverter is sufficient to drive the machine, which further reduces the overall cost. In addition, the proposed machine provides similar efficiencies as the existing machine for both washing and drying operations.
Highlights
The washing machine is an extensively used domestic appliance and the design of its motor is paramount to ensure its efficiency and cost-effectiveness
There are a few important characteristics a motor designed for a washing machine must possess: 1) wide driving range because it must operate at two speeds, 2) high efficiency at both operation points to minimize energy consumption, 3) low cost of the motor and drive to make the washing machine affordable
The washing operation is performed at low speeds, such as 50 rpm, and high torque values are required to enable fast start-up at full load; whereas, the drying operation is performed at high speeds, such as 1400 rpm, and requires low torque but high power
Summary
The washing machine is an extensively used domestic appliance and the design of its motor is paramount to ensure its efficiency and cost-effectiveness. It should be noted that the dual-consequent-pole vernier machine is selected for washing operation because of its high torque density. This is necessary because low-cost ferrite magnets with low Br are desirable for their costeffectiveness, which otherwise will reduce the torque density of the machine, which in turn will affect the efficiency of the machine. Machine B is used for the drying operation (1400 rpm) Additional harmonics, such as the 12th and 20th, are present in the airgap flux density, producing torque ripple. For Machine A, the double-consequent-pole vernier machine was selected because of its higher torque density that was achieved based on the double flux modulation principle discussed earlier.
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