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2.2kW ER25 electric spindle from a "dachshund" type motor.

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  • #2
    FoxTech
    Level 20  
    An interesting project, but without access to a lathe, you can only read how others do it :(
    Has the spindle already passed a steel test? If so, I have a question, what would a colleague do differently / better if he did this spindle again?
  • #3
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  • #4
    Krzysztof Kamienski
    Level 43  
    2800 rpm as a milling spindle ?? Buddy, to the store for an inverter, and fast, with a higher output frequency. :cry: For which materials should this milling machine be used?
  • #5
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  • #6
    Krzysztof Kamienski
    Level 43  
    @ Art.B Yeah, a few years ago I was repairing a CNC machine from USA for regeneration of ball joints. While the x / y / z axis drives were "classic" (DC servo motors with encoders and trapezoidal screws), the headstock ... oh ho, ho .. :D .. 8 kW three-phase synchronous motor, water cooled and driven by a special inverter up to 500 Hz ..... 30,000rpm.
  • #7
    ziomal156
    Level 10  
    Krzysztof Kamienski wrote:
    8 kW three-phase synchronous motor, water cooled and driven by a special inverter up to 500 Hz ..... 30,000rpm.


    This is probably normal in electric spindles. Asynchronous and synchronous motors can have a maximum of 3 thousand revolutions at 50hz, you can not squeeze anymore because there is already one field per phase. Synchronous motors have greater efficiency due to the permanent magnet in the rotor, and may have a smaller rotor diameter than with a squirrel cage motor. And the smaller diameter at such revolutions is the lower linear speed of the farthest point, which translates into a decrease in centrifugal force.
  • #8
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  • #9
    szymon122
    Level 38  
    Out of curiosity I will ask why this engine is called a dachshund?
  • #10
    wojtek1234321
    Level 34  
    szymon122 wrote:
    Why is this engine called a dachshund?

    Because it is "thin" and long, that is, just like a dachshund ... :D :D :D
  • #11
    robokop
    Moderator Cars
    szymon122 wrote:
    Out of curiosity I will ask why this engine is called a dachshund

    Due to the mechanical design - intended to be hidden under the countertop and set the saw directly on the rotor axis. The magnetic poles are narrow and long.
    I do not like the wheel hub bearing entirely - it is not suitable for this. Once it is probably a C4 class bearing, i.e. with a large clearance, two require strong compression of both halves (the inner race consists of two symmetrical halves), which is not ensured by a narrow nut, and three is not suitable for high rotational speeds, especially at elevated temperature.
  • #12
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  • #13
    Martin_250
    Level 12  
    A solution if it only fulfills its task, by all means approx.
    The question is, what acceptable working cycles have such dachshunds?
  • #14
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  • #15
    Wojtek7878
    Level 7  
    Congratulations Art.B
    I would like to use your idea. I already bought the engine.
    You wrote that the hub had an internal diameter of 24.85mm, can you tell me what the shaft size was? or was it 24.85mm or was it a bit bigger? For me, the shaft has a different dimension, but I mean the difference between these two diameters.
    How did you heat this hub? How did you cool the roller?

    I am still considering the option with an ER socket ended with an ISO30 cone and screwed onto the thread on the motor shaft, of course the hub on the shaft would also have to be, but I do not know if it will not be overconfigured.
  • #16
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