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Original question:

DRV8818: DRV8818 Suitability

DRV8818: Can DRV8818 drive a unipolar stepper motor?

ikon
Genius 5355 points
Part Number: DRV8818
Other Parts Discussed in Thread: DRV8886, DRV8886EVM

Hi Support,

Can DRV8818 drive a unipolar stepper motor?

 If can’t, could you help to propose a unipolar stepper motor driver, with the following requirements?:

Requirement

Power supply: 24V

Motor speed Requirement: 1500rpm (25 rev/sec, 40,000pps @ 1/8 microstepping)

Motor Acceleration: High

Microstepping operation requirement: 1/8

Load: 12kg

 

Unipolar Motor Specs

Rated Voltage (V/phase): 3.6V

Rated Current (A/phase): 2.0A

Winding Resistance (ohm/phase): 1.8 ohm

Inductance (mH/phase): 2.5mH

Thanks.

  • 0
    TI__Guru** 114905 points
    Hi ikon,

    It is unlikely the DRV8818 will work. The main reason is the DRV8818 would have to set in asynchronous fast decay mode, which is really slow decay using the body diode for a unipolar configuration.

    The current will probably not be regulated properly.

    Can the motor be configured to operate in bipolar mode? The DRV8886 can drive the motor and regulate current. The DRV8886EVM is available for evaluation.

    I have found some information on line that shows the a unipolar motor connected in a manner using one half of the coil has similar performance.
  • 0
    TI__Guru** 114905 points
    Hi ikon,

    It is unlikely the DRV8818 will work. The main reason is the DRV8818 would have to set in asynchronous fast decay mode, which is really slow decay using the body diode for a unipolar configuration.

    The current will probably not be regulated properly.

    Can the motor be configured to operate in bipolar mode? The DRV8886 can drive the motor and regulate current. The DRV8886EVM is available for evaluation.

    I have found some information on line that shows the a unipolar motor connected as a bipolar motor can have similar performance. The key is to connect the motor using from one output to the center tap.