| |
CONTROL ALGORITHMS MINIMISING LOSSES IN DC-CHOPPER AND AC MOTOR DRIVES
| [View]
[Download]
|
| Author(s) |
P. Gruszczynski; R. Szczesny |
| Abstract |
A chopper-controlled DC motor drive losses can be reduced by independent control of the average output voltage and the chopper frequency. A four-quadrant thyristor DC chopper with two different control methods is considered. Eddy-current armature winding losses of separately excited DC motor are taken into account. An equation is derived permitting evaluation of the frequency minimising the total DC drive losses, given the duty cycle. Several conditions for frequency and duty cycle limits are established, including the conditions for continuous armature current flow. Theoretical results are verified using a 2.2 kW microprocessor-controlled experimental set-up. AC motor drive losses can be reduced by independently controlling the voltage and the frequency. The total losses for the minimum loss operation and the constant V/f operation for a 55 kW induction traction motor are compared. Eddy-current winding losses of a current-source inverter drive are taken into account. The suggested control method makes unnecessary application of oversize motors. |
| Download |
| Filename: | Unnamed file |
| Filesize: | 3.308 MB |
|
| Type |
Members Only |
| Date |
Last modified 2021-02-08 by System |
| |
 |