The rotor position of permanent magnet synchronous motor is mostly detected by mechanical encoders, which increase
the complexity and cost but reduce the reliability of the control system, moreover limit the applications of permanent
magnet synchronous motor in certain special situations. In this paper, one method that can detects the rotor position,
winding temperature and the rotor flux meanwhile through additional windings instead of changing motor structure is
proposed. An additional winding is connected in the orientation opposite to that of the stator winding, and then a
high-frequency current is injected into the winding to calculate the rotor position, sense the main motor winding
temperature and the rotor flux by detecting the variations of the additional winding resistance and back electromagnetic
force (EMF). Experimental results validate that the method is effective and feasible.
Space electromechanical actuator uses a permanent magnet synchronous motor as the servo component, which features
in small dimension, high accuracy and reliability. At the same time the position signal of the electromechanical actuator
is significant for the system performance. Resolver is widely used due to its high temperature tolerance, humidity
resistance, impact resistance, anti-jamming and other advantages. In this paper, the position sensor of the
electromechanical actuator servo system uses a resolver as the rotor position sensor, designes the resolver signal
processing circuit that can get absolute position signal directly, and translate it into digital corresponding quantity.
Decoder chip and controller chip can be linked through the data bus, I/O port and SPI port in order to interface with the
digital signal processor (TMS32F2808) chip which can receive and process the signals of the rotor position. With the
space vector control strategies of Permanent magnet synchronous motor, better performance has been achieved.
Experiments show that the design is compact, high reliability, high precision and has achieved satisfactory results.