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TMC389 Datasheet(PDF) 36 Page - TRINAMIC Motion Control GmbH & Co. KG. |
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TMC389 Datasheet(HTML) 36 Page - TRINAMIC Motion Control GmbH & Co. KG. |
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36 / 48 page  TMC389 DATASHEET (V. 1.15 / 2015-OCT-27) 36 Copyright © 2010 TRINAMIC Motion Control GmbH & Co. KG 13.2 User benefits, save energy, reduce power and cooling infrastructure coolStep™ allows saving a lot of energy, especially for motors which see varying loads and operate at a high duty cycle. Taking into account that a stepper motor application needs to work with a torque reserve of 30% to 50%, even a constant load application allows saving lots of energy, because the driver automatically enables torque reserve when required. The reduction in power dissipation further keeps the system cooler and increases life time and allows savings in the power supply and cooling infrastructure. Keep in mind, that half motor current means a quarter of the power dissipation in the motor coils. This power dissipation makes up for most of the stepper motor losses! The following figure shows shows the efficiency gain of a 42mm stepper motor when using coolStep compared to standard operation with 50% of torque reserve. coolStep is enabled above 60rpm in the example. 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 0 50 100 150 200 250 300 350 Efficiency Velocity [RPM] Efficiency with coolStep Efficiency with 50% torque reserve figure 18: Energy efficiency with coolStep (example) |
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