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IndustryArena Forum > CNC Electronics > Stepper Motors / Drives > Driving 5 phase pentagon stepper motor with L298 and ATMEGA16
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  1. #13
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    May 2005
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    Re: Driving 5 phase pentagon stepper motor with L298 and ATMEGA16

    Running a 5 phase stepper is difficult and there is very little information available on it. I would strongly recommend dumping that motor and going for something more standard.
    James hosts the single best wiki page about steppers for CNC hobbyists on the net:
    http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)

  2. #14
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    Mar 2007
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    1984

    Re: Driving 5 phase pentagon stepper motor with L298 and ATMEGA16

    Hi

    it may of been better to model your stepper driver on a chip set like the Sanken SI-7510 sequencer and fet arrays SLA5073 + SLA5074 or SLA5065 + SLA5068 ( in stock from digikey )

    you could build a working stepper driver using the SI-7510 to test your motor and provide data to compare with a second board using your ATMEGA16 emulating the SI-7510
    that way you have a way of separating some of possible hardware and software problems you may have in your design

    john

  3. #15
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    Re: Driving 5 phase pentagon stepper motor with L298 and ATMEGA16

    I’ve decide to switch from H bright to half bright with array of MOSFET, hence below is the schematic of what I suppose to be work with following assumption
    To initiate the lower array just use the gate TC4420, there won’t be problem to turn on by micro
    To initiate the higher array use isolated auxiliary voltage with optocoupler
    Use opamp for chopping the current whereas voltage of shunt higher than potentiometer voltage (output = 0)
    To initiate the high array output of opamp and micro command must be in high state
    Pulse and direction control have implemented in software code
    Any comet for following schematic is really appreciated

    Click image for larger version. 

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  4. #16
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    Re: Driving 5 phase pentagon stepper motor with L298 and ATMEGA16

    Can you post a larger image? The text is not readable.

  5. #17
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    Re: Driving 5 phase pentagon stepper motor with L298 and ATMEGA16

    please find attached PDF

  6. #18
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    Re: Driving 5 phase pentagon stepper motor with L298 and ATMEGA16

    The circuit won't work. The top part of the h-bridge must be driven with a high side driver. I posted a design for a cpld based stepper several years ago. I've attached the schematic. You can copy the power section and modify it for your drive.

  7. #19
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    Re: Driving 5 phase pentagon stepper motor with L298 and ATMEGA16

    Quote Originally Posted by H500 View Post
    The circuit won't work. The top part of the h-bridge must be driven with a high side driver. I posted a design for a cpld based stepper several years ago. I've attached the schematic. You can copy the power section and modify it for your drive.
    Hi

    I've made new design with new IC FAN7388, regards to its data sheet , it is capable to drive array of mosfet very smoothly, in low voltage and amper before the chopping switching act ,every things is ok and torque is very low but when I increase the voltage (power) , mosfet temperature increase rapidly and get so hot, and motor vibrating , I think maybe this noise and malfunction due yo high chopping frequency of IC, I attached the schematic of my board

    any help is really appreciated

  8. #20
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    Jan 2005
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    Re: Driving 5 phase pentagon stepper motor with L298 and ATMEGA16

    It won't work. There are errors.

    -add a pull up on u4 pin1.
    -swap vpot and vres
    -add a 20 uS time delay between u4 pin 1 and U3. Otherwise it will chop too fast.

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