To find out if a motor is sufficient, we have to plot the motor limits in the torque speed plot. In the previous chapter we have described the following limits:
For higher voltages, a higher stall torque and no load speed is found but the steepness does not change.
In many data sheets a maximum torque is given. This is directly connected with a maximum current limit through the equation:
So both the maximum current and the maximum torque appear as horizontal lines in the torque speed plot.
The maximum velocity can be directly indicated in the torque speed plot as a vertical line.
The line of maximum power can be indicated as a parabola in the torque speed plot.