Limits

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Limits

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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:

 

Limit

Brush DC

Brushless DC

AC Synchronous

torque / current

V

V

V

speed

V

V

V

power

V

X

X

voltage

V

X

X

Maximum Voltage

For higher voltages, a higher stall torque and no load speed is found but the steepness does not change.

TorqueSpeedPlot1

Maximum Torque / Maximum Current

In many data sheets a maximum torque is given. This is directly connected with a maximum current limit through the equation:

MotorFormula24

So both the maximum current and the maximum torque appear as horizontal lines in the torque speed plot.

TorqueSpeedPlot2

Maximum Velocity

The maximum velocity can be directly indicated in the torque speed plot as a vertical line.

TorqueSpeedPlot3

Maximum Power

The line of maximum power can be indicated as a parabola in the torque speed plot.

TorqueSpeedPlot4