The paper presents experimental results to assess the performance of a variety of rotors used in a Brushless Doubly Fed Machine (BDFM). In the experiments the torque-speed characteristics were measured on a BDFM fitted with four rotors with five different windings. The measurements were made of the machine excited with just one stator supply with the second stator supply first open circuit, and...

One maintenance task that still exist with conventional motors, are bearing lubrication and renewal. Bearingless motors are replaced with conventional motor that uses a magnetic levitation force to suspend a rotor without any mechanical contact. In bearingless motors, additional windings are wound together with motor windings in stator slots. In this paper, a bearingless permanent magnet-type s...

An electric commutated frog-leg winding permanent-magnet (PM) DC machine is proposed in this paper. It has a semi-closed slotted stator with a classical type of mesh winding introduced from the conventional brushed DC machine and a polyphase electric commutation besides a PM excitation rotor and a circular arrayed Hall position sensor. Under the cooperation between the position sensor and the e...

A new dual stator winding induction machine drive is described in this paper. The proposed induction machine consists of a standard squirrel-cage rotor and a stator with two separate windings wound for a dissimilar number of poles. Each stator winding is fed from an independent variable-frequency variablevoltage inverter. The proposed drive offers such advantages as speed sensor less operation,...

The Brushless Doubly-Fed Reluctance Machine (BDFRM) has been widely investigated in numerous research studies since it is brushless and cageless there no winding on the rotor of this emerging machine. This feature leads to several advantages for machine comparison with its induction counterpart, i.e., Induction (BDFIM). Less maintenance, less power losses, also more reliability are major BDFRM ...

The structure of an electric machine with a rotor, which has three degrees freedom rotation (EMTR) and consists external internal magnetic circuits, is considered. Between them, in the air gap spherical configuration, there m-phase winding control winding. excitation field EMTR carried out by means permanent magnets located on circuit. scope application EMTP systems stabilization, observation, ...

A dual stator winding squirrel-cage induction motor (DSWIM) is a brushless single-frame induction motor that contains a stator with two isolated three-phase windings wound with dissimilar numbers of poles. Each stator winding is fed by an independent three-phase inverter. The appropriate efficiency of this motor is obtained when the ratio of two frequencies feeding the machine is equal to the r...

An urgent task for many enterprises of the petrochemical and fuel energy complex, using pumps, fans compressors in their technological processes, is to increase speed rotation these turbomechanisms. such mechanisms due an productivity. Quite often, obtaining increased both automation devices special equipment.
 
 The purpose study analyze possibility building synchronous motors with a...