What advantages result from reducing the current (spec. when the motor is at a standstill)?
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Because the holding torque is higher than the torque, a holding torque of the same size can already be reached with a lower current.
In addition, in some applications often only a fraction of the
torque is required at a standstill so that a reduced holding torque is entirely sufficient. Because the power dissipation is
quadratic to the current, with a current reduction of 25% the torque already reduces to approx.
50%.
Example of the ST4118M1404 motor: Power dissipation (loss) Pv = I2 * R = 1.42 * 1.2 = 2.35 W with a current reduction of 25% Pv = I2 * R = 1.052 * 1.2 = 1.32 W = 56%
Not only does this reduction bring advantages in energy resources, but also reduces the average temperature of the drive and the motor. Ultimately, an even longer expected service life of the components can be achieved through the temperature reduction.
All Nanotec drives integrate an automatic or adjustable current reduction and thus considerably reduce the power dissipation at standstill of the motor.
