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Eccentric mass unbalance of the electric motor causes vibration of the shaft and the whole system, when the rotational speed increases. This paper considers rotation about an estimated center of inertia for a bearingless motor to reduce the vibration and power consumption for magnetic suspension. A 12-slot/10-pole bearingless SPM motor is selected for the performance test, because it has low suspension...
A bearingless motor (BelM) integrating function of an electric motor and a magnetic bearing (MB) can generate torque while magnetically suspending rotor shaft without mechanical contact.
Bearingless motors (BelMs), that can realize shaft suspending without mechanical contacts and lubrication by electromagnetic force, have been proposed. However, in outer rotor type BelMs, one-unit structure with small shaft output alone have been developed. Therefore, this paper introduces a two-unit outer rotor type BelM with consequent-pole permanent magnet structure (CPPM) for high shaft output...
A novel winding structure of bearingless motors has been proposed for radial force generation. Additional suspension force windings are not needed in stator slots. All conductors are effectively used for both motor torque and suspension force generations, simultaneously. Original motor coils are connected in parallel, however, these are differentially connected in series from the suspension inverter...
This paper presents magnetic levitation test results of the time-divided torque and suspension force control type bearingless motor. The motor structure, principle of the torque and suspension force and control strategy have been conducted. The torque and suspension force have been simulated by Finite Element Analysis (FEA) using a machine model. As a result, it is estimated that the rotor shaft is...
Bearingless motors are characterized by integration of electrical motors and magnetic bearings. These motors can realize magnetic suspension of rotor shafts without mechanical contacts. If the bearingless motor is applied to a canned motor pump, it is possible to levitate and rotate a impeller and a rotor shaft of a centrifugal pump. Therefore, the bearingless canned motor pump can realize next several...
The inertia force and moment of inertia of engine piston-connecting rod-crank is the main vibration source of motorcycle vibration. In order to reduce the strength of the vibration source, the method of singular balancing shaft is adopted to counterbalance the first-order inertial force based on the structure of single cylinder diesel engine. For the additional first-order moment of inertia 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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