Our BLDS motor becomes warm/hot at no load, at room temperature. In our application the surrounding temperature is more then ambient up until 55°C. Any addition heat that we generate inside the motor will cause the motor to quickly overheat, with possible failure.
Would it be possible to get some advice to use your chip to drive the motor correctly?
We think that the problem is that during the OFF time . Please see Picture 1 , tacho pulse at 120 Hz = 1800 RPM.
Info:
· We use the Nanotec DBL36L 024045-A, 33Watt version to drive a pulley which drives a turbine propeller in an oil bath.
o 8 poles
· The speed that we need is between 1000 rpm to 2100 rpm.
· We choose not to feedback the tacho pulse into Vref, but to do this via the control CPU. (This way we get a information what the tacho is at any Set-value, also detect if the pulley-belt breaks, the tacho shoots up, and even if there is no oil present in our bath)
· Please see the attached schematic
Thank in advance
David Alberti
