For two-phase AC servomotor, if the rotor’s resistance and reactance are respectively R and X, its length and diameter are respectively L and D then,
A. X/R and L/D are both small
B. X/R is large but L/D is small
C. X/R is small but L/D is large
D. X/R and L/D are both large
Answer:C
For two-phase AC servomotor, if the rotor’s resistance and reactance are respectively R and X, its length and diameter are respectively L and D then,
A. X/R and L/D are both small B. X/R is large but L/D is small C. X/R is small but L/D is large D. X/R and L/D are both large
Explanation: Small X/R gives linear speed torque characteristic. Large L/D gives less inertia and good acceleration characteristic.