In this paper, a compact magnetic bearing system has been developed for axial flow blood pumps. The system is composed of two radial hybrid magnetic bearings (HMBs) and a brushless permanent magnet DC motor. The impeller of the pump is enclosed in the rotor that is suspended by the two HMBs with five-degree of freedom (DOF) control, among which four radial directions are actively controlled, an...

This paper illustrate the design and realization of control drive electronics of Limited Angle brushless torque motor for position control of Scan mirror mechanism. The scan mirror mechanism is controlled for the intended limited mechanical angle within +/20deg. The control drive is designed for six selectable positions within +/20deg with an accuracy of 0.75 degree. These six selectable positi...

The hysteresis motor is so named because it is producing mechanical torque utilizing the phenomenon of hysteresis. The rotor of a hysteresis motor is a cylindrical tube of high hysteresis loss permanent magnet material without windings or slots. This paper presents the design of a hysteresis permanent magnet motor using the finite element method. The rotor of the machine consists of 36% Cobalt ...

The paper develops a power factor correction mechanism for a brushless dc permanent magnet (BLDC-PM) motor drive system through the use of a front end boost converter. It evolves a wave shaping mechanism to arrive at the sinusoidal nature for the input current in an effort to improve the input power factor. The theory is articulated using a closed loop algorithm to revolve around the operating ...

Brushless DC motor has a rotor with permanent magnet and has no mechanical commutator which leads to many advantages like less maintenance, long life, high reliability, low inertia, low friction and low noise. Since the brush system/commutator assembly is replaced by an electronic controller which can be easily integrated into other required electronics, thereby improving the effective power to...

This paper describes the experimental study carried out on a Permanent Magnet Brushless DC (PMBLDC) Motor drive coupled to a pump load powered by photovoltaic (PV) array I for water pumping system. A simple low cost prototype controller has been designed and developed without current and position sensors which reduces drastically the overall cost of the drive system. This controller is used to ...

The compound-structure permanent-magnet synchronous machine (CS-PMSM), comprising a double rotor machine (DRM) and a permanent-magnet (PM) motor, is a promising electronic-continuously variable transmission (e-CVT) concept for hybrid electric vehicles (HEVs). By CS-PMSM, independent speed and torque control of the vehicle engine is realized without a planetary gear unit. However, the slip rings...

This study is concerned with the reduction of ripple in thrust force produced a linear Brushless Direct Current Motor (BLDC). To reduce ripples generated force, different methods such as structural solutions are applied both control part and production phase motor. In this study, skew application, which one mechanical methods, proposed. For reason, changes BLDC motor surface magnet-placed trans...

The permanent magnet brushless direct current motor (BLDC), have been the main component in most of the Ventricular Assist Devices (VAD) development. An implantable centrifugal blood pump is being studied at the Institute Dante Pazzanese of Cardiology (IDPC) as Ventricular Assist Device (VAD) to assist patients with cardiovascular diseases. Its use in patients with heart disease is indicated as...