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LDC1000EVM: LDC1000 using questions, looking forward to your answers

Susan Ren
Prodigy 345 points
Part Number: LDC1000EVM

Hi Team,

My Applications

Question 1: This is a four-pole magnetic bearing, and my purpose is to make the rotor in the middle stable suspension at all times during the bearing operation. A sensor is required to detect the position of the rotor at all times. My idea is to make the PCB coil of the LDC1000EVM into the right size and fix it to the stator teeth in the red circle as shown in the figure, because the distance between the rotor and the stator teeth (that is, the air gap) is relatively narrow (only 0.5mm is expected), can the thickness of the PCB coil be less than this size requirement? Can it be placed in this position?

Question 2: Can I place the PCB coil on the red circle as shown in the figure (that is, wrap the PCB coil around the stator winding)? Is this possible? Will it then have an impact on the sensor's detection?

Question 3: Can you provide me with a PCB coil installation solution? Except for the two ways I think myself? Where is it more suitable to install it (the purpose is to detect the position of the middle rotor so that the rotor is stable in suspension)?

Regards,

Susan Ren 

  • 0
    TI__Mastermind 18545 points

    Hello Susan, 

    I have a couple clarification questions for you on this application. 

    • When you say you need to detect the position of the rotor, is this the rotational position or lateral distance from the sensor? 
    • What is the material of the stator? 
    • Have you already considered a Hall-effect sensing solution for this application? 

    In regards to the 0.5mm spacing, you can use a flex PCB for the LDC coil to meet this spacing requirement. You may need to include a stiffener in the design to ensure that the flex PCB is stable during operation which will take up some of this space. 

    Best Regards, 
    Justin Beigel