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This paper presents the experiment results from the testing of a magnetic suspension system in a bearingless brushless dc motor. This machine is suitable for use in small liquid pumps. The bearingless motor structure, the principle of the suspension force generation, and the magnetic suspension control strategy are proposed by the author. A prototype bearingless brushless dc motor is designed using...
This paper presents the magnetic suspension test results of a bearingless motor/generator for flywheel energy storage systems. A prototype bearingless motor/generator is built on the basis of the computed results by Finite Element Method (FEM). It is an outer rotor-type permanent magnet (PM) synchronous motor/generator and the rotor is wrapped by the flywheel (CFRP). Thus, the motor/generator, the...
This paper presents a new decoupling method of the radial forces in a dual rotor-type magnetic suspension motor. The dual rotor-type magnetic suspension motor has been proposed by the author, and the motor structure and the principle of the suspension force generation have been introduced. However, it is possible that the mutual interference between the radial suspension forces in two perpendicular...
Exploitation of the renewable energy is expected one of the most effective expedient to reduce of green house gas emissions, principally CO2. In this context, small-sized hydraulic power generation is considered one effective method because of its potential energy amount. However, mechanical bearing which support the rotor shaft causes rotational loss and durability limitation. For the purpose of...
This paper presents the experiment results of the magnetic suspension in a bearingless brushless DC motor to apply in small liquid pumps. The bearingless motor structure, the principle of the suspension force generation and the magnetic suspension control strategy in the bearingless brushless DC motor have been proposed by the author. A prototype bearingless brushless DC motor has been designed based...
This paper presents a new magnetic suspension control strategy for the bearingless brushless DC motor. In the proposed control strategy, general-purpose 3-phase inverters are used to control the rotor radial position; in conventional control schemes, 2-phase inverters are usually used. By using 3-phase inverters, the number of inverters and controllers can be decreased. In addition, the suspension...
A thrust magnetic bearing having a conventional thrust magnetic disk is usually installed in five-degree-of-freedom controlled bearingless drive systems. The thrust disk has a larger diameter than a rotor diameter of the bearingless motor. Therefore, a geometrical shape of the rotating part becomes convex. The convex-shaped rotating shaft causes complicated assembly and disassembly processes and increases...
A new non-contact drive system has been developed employing a consequent-pole type bearingless permanent magnet (PM) motor. This bearingless motor has a much wider gap with respect to its rotor radius. Wide magnetic gaps can cause a decrease in radial magnetic suspension force of the bearingless motor because of an increase in magnetic reluctance. In this paper, the magnetic suspension forces of the...
This paper presents magnetic suspension characteristics of a bearingless brushless DC motor. The winding distribution, the principle of suspension force generation, and the magnetic suspension control strategy have been proposed by the author. The rotational torque and suspension force have been analyzed by finite element method (FEM) using a machine model. A prototype bearingless brushless DC motor...
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