Flying Electron wrote: > Motors > -------- > [brushless] Pico Size 23 Brushless Servo (61ozin continous, 180ozin > peak, 1000 CPR) $120 > [brushless] Keling KL23BLS-115 Brushless Servo (61ozin continous, 180 > ozin peak, 1000 CPR) $134 > The above two are the same motor. Has Keling raised their prices? Also, note the Keling motor does not have an encoder fitted to it. I think your $134 price is for their size 34 motor. > [brushed] Keling KL23-130-60 Brushed Servo (50ozin continous, 350ozin > peak, 1000 CPR) $162 > Also note that many of the brushless motors on Keling's site are not in stock, but essentially special order items. > Most of the servo drives I have found have the PID loop built into > them. Is this the normal case? > Yes, certainly for industrial, high-end drives like Servo Dynamics and AMC, this is true. And, you pay for the necessary intelligence in the drive. > Is it possible to run a brushed DC servo with just a simple H-Bridge > controlled directly by the PWM output and a direction signal? Yes, but you have to be very careful about how you deal with overcurrent and current limit situations. Also, the motor inductance and the fast switching of the transistors can produce a LOT of electrical noise. That's why my drives (Pico Systems) have output filters, to save you the hassles of noise getting into your encoders.
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