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Help choosing right EVM for spindle motor development

Charlie Jenkins
Prodigy 200 points
Other Parts Discussed in Thread: DRV8301

We are working on a sensorless three wire drive to a high speed spindle motor in the 250-500 watt category.  Voltage is around 50V and current in the 5-10A range.  Scale-ability would be nice so I am looking at the DRV8301/2 and FET population options.  

The motor is AC induction (no magnets), single pole three phase, three wire.  Constant speed operation with no feedback at 100,000 rpm max.

Due to the speed I think a piccolo  is in order.  The 8301/2 dev boards mention BLDC and PMSM as supported but will this board also support a three wire AC (no center leg tap) with its sensorless algorithms?

Charlie J

  • 0
    TI__Guru** 119420 points

    Charlie, All of the induction motor software (sensored, V/f, SL FOC) are all shown as examples on the TMDSHVMTRPFCKIT.  We haven't shown any ACI control on the DRV830x kits yet mostly because it's so hard to find a low voltage induction motor.  The techniques shown - and some new ones about to released - can be ported onto the DRV8301 though...and in actuallity the TMDSHVMTRPFCKIT can be run at 50V (lower limit) and up to 10A (fuse limit) so that may be something you look at as a tradeoff.

    Is the motor you are using widely available? We would love to get one.  If it's something custom I'd love to try something new we have out with it, I would share the results with you  :)

     

  • 0 in reply to ChrisClearman
    Prodigy 200 points

    Hi Chris

    The spindles are mostly German. Jaeger, SyncoTec (Kavo), Renaud, Henninger ...  Centerline and HPT are reps. 

    http://www.centerline-inc.com/

    http://www.hpt-drivesystems.com/

    Most of the motors are very high speed 60-100Krpm, single pole 3 phase induction. A typical old school drive would use a three half bridges, IR2110, Gal16V8 and some form of CPU or DSP.  The GAL performed the bridge control.

    One example is the Jaeger Z33M060.05 S1. This is a 60Krpm motor, 180W, 46V.  I have one of these waiting on a bearing. I could loan it to you for development.  They cost about $2400 new. $1400 used.

    Charlie

  • 0 in reply to Charlie Jenkins
    TI__Guru** 119420 points

    Charlie,

    Ok, a 60k RPM 2 pole motor is 1KHz frequency.  That is do-able for FOC.  But I will say that for spindle type applications and very high speed, high acceleration with high current motors we tend to see more direct torque control (with hysterisis controllers vs. FOC) and often using switched reluctance motors vs. induction or pm.  You may want to investigate those techniques a bit.  Unfortunately we haven't published anything recently on the topic.