# what is cut off current in dc motor?

This question is conceptual question. May it is easy for engineers to explain cut off current in DC Motor.

In our formula, we are finding motor torque,

$$T_{motor} = C_{motor} \times (I_{cut} - I_{ideal})$$ where,

$$T_{motor} [Nm] = motor \ torque$$ $$C_{motor} \ [Nm/A] = motor \ constant$$ $$I_{cut} \ [A] = Cut \ off \ current$$ $$I_{ideal} \ [A] = Ideal \ current$$

In this formula, We know motor constant, motor ideal current but, we don't know cutoff current.

$$\textbf{what is cut off current in dc motor?}$$

• Never heard of such a thing. Could you explain your concept a little more? – JRE May 31 at 11:17
• Which still doesn't explain the term "cutoff current." – JRE May 31 at 12:10
• I suspect that cut-off current is the current at which the torque is insufficient to overcome internal friction. That can be easily determine and may be published in the form of a current vs. output torque curve, but is unlikely to be listed in specifications. – Charles Cowie May 31 at 12:51