A new operational mode for mixed-pole machines is presented. The proposed wound reluctance rotor machine can produce an n-phase rotor electric power from the rotor windings to a resistive or inductive load, independent of rotor torque, at any desired synchronous speed. The two-stator windings, with a different number of poles, are fed from two voltage source inverters on a common dc link. This type of machine can be used in applications that require control of both rotor torque and rotor electric power, such as contactless rotational antennas and turret systems. The machine mathematical model is presented, with open- and closed-loop control systems, simulated and experimentally validated

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This paper presents the performance, steady state and stability analysis of mixed pole machine with a new mode of operation where n-phase electric power can be transferred to a load mounted on the rotor. This type of machine can be used in applications that require control of both rotor torque and rotor electric power, such as rotational antennas and turret systems. The performance includes machine torque, electric efficiency, mechanical efficiency, total efficiency and system stability. Experimentation using a prototype machine confirms the simulation results.Index Terms-Mixed-pole machine, performance, rotor electric power.

INTRODUCTION: The timing of implant placement after tooth extraction has been a matter of discussion in dental implant treatment. Primary stability of the implant placed can be measured by the resonance frequency analysis (RFA) which is used to compare the primary stability of immediate and delayed immediate placed implants. OBJECTIVES: This study was designed to compare between primary stability of immediate placed implants and delayed immediate placed implants using resonance frequency analysis device in mandibular single rooted teeth. MATERIALS AND METHODS: Ten patients were selected from Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Alexandria University divided into two groups, Group A: Five patients indicated for extraction of single rooted teeth had undergone implant placement immediately after tooth extraction (Immediate implant placement). Group B: Five patients indicated for extraction of single rooted teeth had undergone implant placement two weeks after tooth extraction (Delayed immediate implant placement). RESULTS: For group A patients the average mean and standard deviation of the primary stability of the placed implants was 61.75 ± 8.21 ISQ units while for group B patients the average mean and standard deviation of the primary stability of the placed implants was 67.38 ± 11.59 ISQ units. After comparing these results it was shown that the average mean and standard deviation of the primary stability of all cases of group B is greater than the average mean and standard deviation of the primary stability of all cases of group A, which results in a t-value (student t-test) of 0.792 and the p-value of the study was 0.458 which is statistically insignificant. CONCLUSIONS: There is no significant difference between the primary stability of immediately placed implants and delayed immediate placed implants.