- stepper: direct control but less powerfull, no feedback necessary
- servo, DC, AC motors: need feedback & power modification (closed loop systems)
|Types:||MOTS2 ST35||MOTS1 ST28||103H546 Sanyo Denki|
|Angle/step:||7.5 deg (?)||5.625 deg (?)||1.8|
|Gear ratio:||1:85 (?)||1:64 (?)||none|
|detent torque:||350gfcm (0.034Nm)||310gfcm (0.030Nm)||1.5 kgcm (0.15 Nm)|
|pull-in torque:||600gfcm (0.059Nm)||360gfcm (0.035Nm)||?|
|max. starting pulse rate:||500pps||700pps||500pps|
|max. slewing pulse rate:||800pps||1400pps||?|
|max. speed:||11.8 rpm||20.5 rpm||30 rpm|
|steps/rev:||2040 (tested!!)||2048 (tested!!)||200|
Propably the MOTS1 will have the same winding, but now brown & red are internal wired.
It appears that current rise time is depend on the L/R constant (coil inductance/resistance). This means with the same power the motor will react faster. In graph below the formula is shown and the current rise against time.
So it's obvious to have a low L/R constant for better results. Motors I found so far have a L/R between 2 and 10 [mH/ohm].
Lowering L/R Constant:
By adding an extra resitance, the L/R could be lowered and the voltage could go up, so the current rise time will react faster. So your motor could run faster at higher step frequencies. Because torque is lineair to current, you have more torque left at same speed :)
|Unipolar||2 & 4||Nameplate||Nameplate||Nameplate||Nameplate||Nameplate|
|Bipolar Series||3 & 5||X2||X4||X0.707||X1.414||X1.414|
|Bipolar Half Coil||1||Nameplate||Nameplate||Nameplate||Nameplate||Nameplate|
This will result in different torque-speed outputs and is also depending on the type of driver you use. See picture below for some different winding methods: