I would to identify efficiency, voltage, current for a particular Brush less DC motor in our lab given characteristic curves.
Electrical specifications are
The operating conditions are
Torque: 0.35 N.m RPM : 1200
Based on the operating condition, i drawed one more torque vs speed line (orange color) passing through 0.35 N.m & 1200 rpm and keeping slope constant.
To explain the image
Horizontal axis (X) : Torque (N.m) Left Vertical axis : U(V) - Applied voltage - Light Blue color I(A) - Current - Green color P1(w) - Electrical power input - Dark Blue color Right Vertical axis : n(r/min) - Revolution per min - Orange color P2(w) - Mechanical power output - Red color Eff(%) - Efficiency - Brown color
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I have drawn few vertical and horizontal dashed lines(pink in color) passing through the operating point (0.35 N.m and 1200 rpm).
As the voltage vary the torque vs speed curves, does the efficiency curve vary ? what about the voltage and current ?
What are the approximate values in my case ?
Current = 8 Amps ? Voltage = 15.00 or 17.50 V ? Efficiency = 50 % ?