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3 Maszyny Elektryczne : zeszyty problemowe

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EMC of universal DC motor

100%

Kaňuch J. , Višnyi P.

tom Nr 88

209-215

This document deals with electromagnetic compatibility (EMC) of universal motor operating at AC and DC power supply. Universal motors are used in a variety of applications and can be operated either at AC or DC supply current. The advantages of universal motors are especially high starting torque, very compact design and high running speeds. The drawback consists in the fact that the commutator and arcing brushes create electromagnetic interference (EMI), ozone and noise. This paper presents the results of oscilloscopic measurement of disturbing magnetic field in proximity of a universal motor at various speeds at AC and DC operation mode. The time derivation of the magnetic flux density is converted by an inductive coil to a voltage to be observed by oscilloscope.

DC drive for universal motor

100%

Kaňuch J. , Višnyi P.

Maszyny Elektryczne : zeszyty problemowe

2009

tom Nr 84

7-11

Universal motors are usually operated in AC mode and are controlled by means of triacs. This conventional solution is characterized by a cheap control hardware. On the other hand, it has some drawbacks. In particular the high peak to peak current gives poor motor efficiency and the consequential high brush temperature leads to limited motor lifetime. Significant improvements are obtained when using a more exacting converter. This paper presents the results obtained by using a diode rectifier and PWM controlled IGBT chopper. The RMS and peak-to-peak current of the motor are reduced, as well as electric losses and brush temperature. In addition, this operation mode enables increasing the motor output power or the motor lifetime. In order to reduce switching losses and electromagnetic interference of the converter, the assumed switching frequency is not higher than 1000 Hz.

Control of Two-Phase Induction Motor Using a Conventional Three-Phase Bridge Inverter

100%

Kaňuch J. , Višnyi P.

2013

tom Nr 4(100), cz. 2

171--174

This paper describes the control of two-phase induction motor using a conventional three-phase bridge inverter. Two-phase induction motors in comparison with conventional three phase motors have the advantage of a simple stator current vector control. The physical phase currents themselves represent the coordinates of the stator current vector. For this reason two-phase induction motors are ideal for educational purposes as well as for experiments verifying various control strategies (for example sensorless speed control). The inherently best inverter topology for a two-phase induction motor consists of two single-phase bridge inverters. However, using a conventional three-phase bridge inverter may be an interesting alternative described in this paper.