Question

# An armature-controlled dc motor operates at steady state, with an armature drive voltage va = 10 ...

An armature-controlled dc motor operates at steady state, with an armature drive voltage va = 10 V. The motor runs at 600 rpm, and the armature current is found to be ia = 0.2 A. The armature resistance is Ra = 15 Ω.

Determine:

(a) The torque constant km of the motor

(b) Electrical damping constant be

(c) The efficiency under the given operating conditions, if the mechanical damping constant is bm = 8.25 × 10−5 N ⋅ m/rad/s

(d) The load (torque) TL under the given conditions

Hint: To calculate efficiency, the input power is vaia. The power lost to mechanical dissipation is =

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