Industrial sensorless permanent magnet synchronous motors (PSM) working at minimum speed of about 10 % of rated speed have been in use for some years. However, PSM drives with high static and dynamic quality down to standstill have just started to be in use in industry. This paper presents a description of the properties of PSM drives using the INFORM® method for sensorless zero-speed control even for torque-, speed and even position-controlled applications. It is shown that the method is able to ensure highly transient operation even at high torque (up to a few times of rated torque) in the low-speed range. Evaluating the statistical properties of the method [Figs. 5, 7] yields probabilities of failures during the lifetime of the drive depending on the “INFORM quality” of the PSM as well as on the dynamic load properties of the application. An industrial example shows the advantageous application of the method in a positioncontrolled series application.
| Filename: | EPE Journal 13-3 - 5 - Paper Schroedl |
| Filesize: | 218 KB |
