CORRESPONDENCE. HIGH-SPEED MOTORS AND DYNAMO-ELECTRIC MOTORS.

Speed-Sensorless Control of Induction Motors for Electric Vehicles

An electric bus system has been operating in the downtown area of Chattanooga, Tennessee for more than four years. The buses use traditional hard-switched IGBT inverters driving special induction motors with a speed sensor (tachometer) and two embedded fluxsensing windings to provide rotor speed and flux information to the motor controller for implementation of high performance field oriented c...

Electric Motors and Drives This Page Intentionally Left Blank Electric Motors and Drives

Optimization of Direct Drive Induction Motors for Electric Ship Propulsion with High Speed Propellers

Direct drive electric ship propulsion can offer increased flexibility and reduced overall fuel consumption compared to geared mechanical systems [Davis 1987, Doerry 2007]. As a well-established technology, induction motors are a dependable and economical option for electrically controlled ship propulsion, but their size and weight are large due to the relatively low propeller speeds. Increasing...

High-speed DNA-based rolling motors powered by RNase H

DNA-based machines that walk by converting chemical energy into controlled motion could be of use in applications such as next-generation sensors, drug-delivery platforms and biological computing. Despite their exquisite programmability, DNA-based walkers are challenging to work with because of their low fidelity and slow rates (∼1 nm min(-1)). Here we report DNA-based machines that roll rather...

Performance Characteristics of High-speed Low-power Induction Motors

The paper presents operational characteristics of a small induction motor with the stator core made of amorphous laminations, supplied from mains or frequency inverter at 100 and 200 Hz. Calculations were performed using field-circuit and equivalent circuit approaches taking account of non-linearity and additional losses both in the core and in the windings. Data for mechanical losses, magnetis...