| Title |
Zero-Current Switching LLC Resonant Post-Regulator for Independent Multi-Output |
| Authors |
Sang-Ho Cho ; Jong-Kyu Yoon ; Chung-Wook Roh ; Sung-Soo Hong ; Jong-Hae Kim ; Hyo-Bum Lee ; Sang-Kyu Han |
| Keywords |
Zero-Current Switching(ZCS); LLC; Post-regulator; multi-output |
| Abstract |
This paper deals with the estimation method on the initial pole position of a z-axis permanent magnet linear synchronous motor(PMLSM) without magnetic pole sensors such as Hall sensors. The proposed method takes account of the gravitational force at z-axis and also the load conditions. The algorithm consists of two steps. The first step is to approximately estimate the initial q-axis by monitoring the movements due to the test current at predefined different test q-axes. The second step is to estimate the real q-axis as accurately as possible by using the outputs corresponding to torques due to the test current at three different test q-axes in order to avoid the effect of load mass variations. Experimental results on the z-axis PMLSM show good estimation characteristics of the proposed method irrespective of load mass conditions. |