Part Number: TMS320F28069M Hi, I'm using F28069M launchpad with custom board. My existing board is not including voltage sensors for back emf sensing. I'm measuring phase currents with lem current transformer(only measures AC) and these sensors connected to phase lines. My feedback source is an incremental encoder. I'm running Lab12b. I have adjusted the spintac gain value. Motor type:pmdc, Rs:1,55 ohm, rated current:2.6A, speed: 3000rpm, power:400W. I applied these suggestions from these topics: http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/336283 http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/336283 Also I read this topic and related topics: http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/287319 I'm spinning the motor but it takes too much current. When I applied 48V and 1A current limit from power supply, voltage is decreasing 19V-1A in ctrl offline state and 17V-1A in ctrl online state(speed ~100rpm). However this motor should works with around 150mA under 48V. I tried change the current scale factor, spintac gain, adc read order, phase order etc. but nothing changed. I'm reading encoder and it looks like working and I'm not using FAST. My questions: 1. Why too much current? 2. Is current ADC data per unit or amps? 3. I can not exceed 150rpm under same conditions why? 4. What is proper way to use the Instaspin Motion for this situation? Thanks in advance.
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