Rotor (electric)

About: Rotor (electric) is a research topic. Over the lifetime, 179978 publications have been published within this topic receiving 1206167 citations. The topic is also known as: electric motor rotor & blades.

Flat type-vibration motor

Abstract: PURPOSE: A flat vibration motor is provided to enhance the number of rotations and vibration characteristics by arranging an auxiliary magnet on an upper case. CONSTITUTION: A flat vibration motor(1) includes upper and lower cases(10,20), a shaft(15) inserted into the upper and lower cases(10,20), an eccentric rotor(30) eccentrically supported on an external part of the shaft(15), and a magnetic force generating unit fixed on an inside surface of the upper and lower cases(10,20) around a center of the eccentric rotor(30). A flange is formed on the upper and lower cases(10,20) to axially fix both ends of the shaft(15) at the center of the inside surface. A substrate(21) is attached on an upper surface of the lower case(20). An end of a pair of brushes(23) is fixed to the substrate(21) and upper end of the brushes(23) upwardly extends toward the eccentric rotor(30). The shaft(15) is a fixed shaft for allowing the eccentric rotor(30) to rotate. Both ends of the shaft are fixed to the flanges of the upper and lower cases. A bearing is inserted on an end of the center of the shaft(15). A shaft hole is formed on a side section of the eccentric rotor(30), and the bearing is inserted into the shaft hole, so that the eccentric rotor rotates about the shaft(15).

Architecture for electric machine

Abstract: The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be used to control at least one of the output voltage and current of the first winding.

Noninvasive detection of broken rotor bars in operating induction motors

Abstract: A description is given of a computer-based noninvasive broken bar fault detector for squirrel-cage rotors of induction motors. The detector can be applied to existing motors without disassembly or shutdown and has the sensitivity to diagnose the presence of a single broken bar or an open end ring. It is suitable for monitoring the trend of the motor signature, or it can be used as a one-time diagnostic tool. >

Torque compensated electrical motor

Abstract: An electric motor having a cage pivotally mounted at one end to a post interior a housing by a first bearing and at its other end by a second bearing between the exterior of the cage and the interior of the housing. A first stator is mounted to the interior of the cage and has an output shaft and first rotor interior thereto. A second rotor is mounted to the exterior of the cage and interior a second stator which is mounted interior the housing. The second stator is driven with a control signal which is a function of the measure reaction torque experienced by the first stator to produce a counter torque to balance the reaction torque. A consistency transmitter mounted on the output shaft produces torque on the first stator as a function of the consistency of the material in which it is rotated.

Turbomachinery Rotordynamics: Phenomena, Modeling, and Analysis

Abstract: Structural-Dynamic Models and Eigenanalysis for Undamped Flexible Rotors. Rotordynamic Introduction to Hydrodynamic Bearings and Squeeze-Film Dampers. Rotordynamic Models for Liquid Annular Seals. Rotordynamic Models for Annular Gas Seals. Rotordynamic Models for Turbines and Pump Impellers. Developing and Analyzing a System Rotordynamics Model. Example Rotor Analysis. Appendices. Index.