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ulhasfegade

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Posts posted by ulhasfegade

  1. Is there any way to calculate maximum field weakening allowed so that amplifier current always within the specified limit.

     

    e.g. my motor parameter are

     

    Back emf= 415.15 V/1000 rpm which gives 145 V for 350 rpm for Geobrick.

     

    Phase winding resistance is 4.15 ohm. Hence if we ensure minimum back EMF of 93.75 V will provide the safe limit for the amplifier (240*0.65-102)/4.15< 15 amps.

     

    With this limit, amplifier will be safe in all the cases.

  2. Is there any way to calculate maximum field weakening allowed so that amplifier current always within the specified limit.

     

    e.g. my motor parameter are

     

    Back emf= 415.15 V/1000 rpm which gives 145 V for 350 rpm for Geobrick.

     

    Phase winding resistance is 4.15 ohm. Hence if we ensure minimum back EMF of 93.75 V will provide the safe limit for the amplifier (240*0.65-102)/4.15< 15 amps.

     

    With this limit, amplifier will be safe in all the cases.

  3. We have a brush less servo motor which is rated for 400 rpm which we are running on Geobrick controller. We want to increase its rpm. The limitation is the back EMF generated by the motor. Can we use field weakening above 400 rpm to reduce the back EMF and increase the speed of the motor?

     

    I could not see any section in the manual which deals with field weakening of brush less servo motors.

  4. We have a brush less servo motor which is rated for 400 rpm which we are running on Geobrick controller. We want to increase its rpm. The limitation is the back EMF generated by the motor. Can we use field weakening above 400 rpm to reduce the back EMF and increase the speed of the motor?

     

    I could not see any section in the manual which deals with field weakening of brush less servo motors.

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