Project Title:

Advanced Induction Servomotor

05.03-0540
911676
Advanced Induction Servomotor
Satcon Technology Corporation
12 Emily Street
Cambridge
MA
02139-4507
Richard L.
Hockney
617-661-0540
JSC
NAS9-18673
086

05.03-0540
911676

Abstract:

Advanced Induction Servomotor
This project will design, fabricate, and demonstrate an advanced induction servomotor
and control system concept having high positioning precision coupled with outstanding
electrical noise characteristics. The concept will incorporate a unique multi-disk,
axial air-gap induction motor driven by a resonant converter operating at 20 kHz.
The resonant converter uses pulse-population-density modulation to both operate the
induction motor as an extremely power-dense and efficient, four-quadrant, variable-speed
actuator and to actively suppress output shaft torque ripple. The pulse-population-density
modulation approach provides inherent suppression of electromagnetic interference
(EMI) while minimizing required filtering and shielding. The control system will
be sensorless, providing feedback control based on estimated motor state. The project
will result in a space-certifiable design having a combination of small size, low
EMI, and low harmonic levels not previously possible with brushless servomotors.
Phase I will provide a preliminary design and detailed planning for Phase II. Phase
II will construct a prototype unit for testing based on the preliminary design developed
in Phase I.
The project's goal is to reduce the weight of robotic systems by improving the efficiency
and reducing the weight of the electrical distribution and drive system. In addition,
the development of improved electro-mechanical drives will have application to aircraft,
commercial ships, and industrial controls.
electromagnetic, resonant converter, actuator, induction motor, control