I am trying to drive a 3 watt BDCM with centrifugal fan, to replace a current design which uses a Toshiba TB6575. I am finding I cannot get the motor up to top speed - I am using the TI dev kit. On the TI driver the DC current at max rpm is around 300mA.
Quoted motor characteristics are
12 pole, 1.34V rms between phase at 3000 rpm , 1.4 ohm between phases, 0.2mH between phases.
The best results I can get with the dev kit are with the following settings
Resistance 696m, Kt 6.42, T control 120u, accel current limit 3A, lock detection limit 3.2A
The motor will run up to just over 50% then trips out. I have tried tweaking the resistance setting, Kt, and T control - at 150uS the motor seems to run at lower current but trips at about 52% speed. At 120uS the motor draws more current but doesn't get above 52% (but does not trip out).
The dev kit happily drives the much larger Runtian motor that came with it, so I don't see why it shouldn't drive the smaller one!