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  1. ehat001

    BLDC Speed and torque

    Thank you all. Much clearer now!
  2. ehat001

    Intrinsically Safe Motor for UL60079

    It is for a portable blower (air mover) so an air motor wont work
  3. ehat001

    Intrinsically Safe Motor for UL60079

    Just an update... I am looking for what I have seen called a "micromotor" ie: somewhere around 25mm in diameter It needs to be brushless I am looking for "ib" rating I will try Globalspec and thomasnet.. Thanks, Erik
  4. ehat001

    BLDC Speed and torque

    I thought the BEMF was used to "look" at the speed... the voltage of the BEMF is directly proportional to the speed (generator) from that speed (voltage) you adjust accordingly to the required speed by way of commutation...
  5. ehat001

    Intrinsically Safe Motor for UL60079

    Can anyone make a recommendation for a manufacturer experienced in designing Intrinsically Safe motors to meet UL60079 or Someone that has them? (12V, 8V, maybe even 4V?) Thanks Erik
  6. ehat001

    BLDC Speed and torque

    Bill, thanks for the explanation. So the speed of the motor is controlled by the speed in which you run through the 6 commutation steps. Then what or why PWM during the commutation blocks? Is PWM to adjust the torque? Thanks Again
  7. ehat001

    BLDC Speed and torque

    I am having trouble wrapping my head around this. Everyone says BLDC motors are speed controlled via voltage BUT the force (torque) produce by a coil or wire in a magnetic field is equal to F=BlI (Force(torque) = B,flux density * l,length of wire * I,current in wire). So the more current...

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