{'fraction_non_alphanumeric': 0.022172949002217297, 'fraction_numerical': 0.0011086474501108647, 'mean_word_length': 5.496402877697841, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Magnetically geared pseudo direct drive for safety critical applications

This paper presents an investigation into the electromagnetic design and performance of a fault-tolerant magnetically geared Pseudo Direct Drive (PDD®) electrical machine for primary flight control surface electromechanical actuation. It is shown that a large number of combinations of high-speed rotor (HSR) pole pairs, pole-piece numbers, and stator slot numbers exist for which a duplex 3-phase fault tolerant configuration can be realized. Furthermore, in addition to facilitating a lower mass solution, it is also shown that a PDD presents a significantly lower inertia referred to the screw, when compared to direct-drive or mechanically geared motor solutions. The findings are validated on a prototype PDD, which has been designed and built to meet the requirements of primary control surface electromechanical actuator.