Recent content by LeGa

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  1. L

    Digital Servo Drives

    It's impossible at all! The resolver is analog position sensor with sine/cos output produced under applying high frequency analog excitation. The encoder has digital A,B signals as a rule.
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    Regenerative Braking vs Dynamic Braking

    The regenerative braking - due to costliness - may have sense with power >5kW only. And dynamic braking is used for effective deceleration when servo closed loop is disabled.
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    EMC/EMI Filter Question

    The filter on the output side of the VFD doesn't protect both, no VFD and no motor - it decrease EMC/EMI level produced by VFD itself simply.
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    How to Synchronize Motor Speed

    You must choose inverter with additional encoder input for implement Master-Slave mode.
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    Yaskawa Servo Motor Encoder Alignment

    The better way is to contact local Yaskawa representative.
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    Question on PID Controller and Adaptive Control

    You can control your DC motor with open loop by changing PWM duty cycle, but using rate control for transition processes. If you want close velocity loop control, simpler back-EMF feedback maybe helpful.
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    Linear Motor/XY Table Brands

    Look at Anorad, Etel, Hiwin, Schniberger, Akribis and Newport linear motors and stages manufacturers.
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    Unidrive M700 with EtherCAT

    Maybe you need define "remote" mode for EtherCAT using RS232?
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    A.C Servo Drives and Motors

    The right way is using Manual from AC servo drive manufacturer.
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    Synchronizing 2 Servo Motors Connected to 2 Rolls with Different Diameters

    Do you use standard Master-Slave configuration - i.e. Slave controlled by Master encoder? Do you have high or low difference between both rolls' diameters? What's happens if you keep Gear ratio constant? i.e. one of motor load is increased?
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    Synchronizing 2 Servo Motors Connected to 2 Rolls with Different Diameters

    It seems that you must change Gear Ratio from step to step according to difference in motors' load.
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    Process Control - Feedforward

    Standard PLC have limiting features for process control if has ones at all. The better way is using Process Controller with referred feature if you find ones.
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    Driving Low Inductance PMSM

    It seems that current command isn't reach friction level in spite of load absence for 1st case. And with higher current command for 2nd case you can overcome friction, but due to existence of current loop only (without not velocity or not position loops), velocity going up to max value...
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    BLDC Control Board

    Why is "evaluation board"? You can buy servo amplifier for your bldc hub motor 48V/20A from leading manufacturers as Elmo, AMC, Copley, etc.
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    Adaptive PD algorithm

    1. You need define range of Kp and kd (i.e. low and high limits) as well. 2. You must take absolute value of e(t) 3. Changing of kd is effective for dynamics but not for steady state
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