Desenvolvimento de um motor com imãs permanentes e núcleo do rotor obtido a partir da metalurgia do pó para aeromodelos

This work aims at developing a three‐Phase Synchronous Motor with Permanent Magnets (small motor), for use in model airplanes, in which the stator core was obtained from Powder Metallurgy Process (P/M). Initially, sewed up pure iron specimens, also with other elements, such as Fe‐P, Fe‐Si and Fe‐Ni. These materials were compacted and sintered in hydraulic press in ovens with controlled temperatures. The physical properties comprising the magnetic quantities acquired by hysteresis curves, electrical resistivity and mechanical properties were examined. Core loss tests were done in the form of transformers to observe income in varying frequencies. Results were compared with each other and with the motor with stator plates; was chosen then the construction of the core from the sintered alloy Fe1% P for present good characteristics. After winding, the stator plates was replaced by sintered in a single stator block Fe1% P for testing bench for various drive currents, which can be analyzed efficiency compared to the conventional motor with the stator core sheets. In tests in core processors, in frequencies above 400 Hz, the magnetic losses composite decreased becoming practically negligible. In the mini motor stator sintered Fe 1% P, with the current increase and speed, which corresponds to the frequency increase, the maximum yield reached 73% compared to the motor with stator plates.