mercredi 28 décembre 2011

lego motor

    The roster

    Electric Technic Motor 9V

    Lugnet Partsref 2838c01, Peeron 2838c01, Lego 74569

    The older 9V Technic motor (1990). Ungeared, it has a high rotation speed and low torque, so for most applications it requires an external gear reduction.

    Electric Technic Micromotor

    Lugnet Partsref 2986, Peeron 2986, Lego 70823

    Appeared in 1993, this small, light weight motor turns slowly and offer low torque - but respectable torque for its size. Must be used generally with pulley, top andbase, but other motion transmissions are possible (see examples by Brian Sadowsky, with a 16t gear/clutch or a pin joiner)

    Electric Technic Mini-Motor 9v

    Lugnet Partsref 71427c01, Peeron 71427c01, Lego 71427

    Since 1997, this motor replaces 2838. Geared down and quite efficient, this is the motor of choice for most applications.

    Electric Technic Mini-Motor 9v

    Lego 43362

    In 2002, Lego replaced 71427 motor with a new type, 43362. Externally almost identical, its internal structureis very different. Performances are almost as good, and its weight is much lower.

    Electric RC Race Buggy Motor

    Peeron 5292

    Introduced in 2002, this motor appeared with 8475 RC Race Buggy. Very powerful, it also consumes a lot of energy. Not recommended for use with a RCX which can't deliver the current needed by this beast. The innermost shaft hole is geared up by a 23/17 factor. Only the outermost output is tested below.

    Electric Technic Motor 9V Geared

    Peeron 47154

    This motor was first included in 4094 Motor Moversset (2003). Provides an axle hole with friction, allowing to choose axle length without the need of an extender. Flat bottom allowing easy mounting.

    NXT motor

    This motor is specific to the NXT set (2006). Includes a rotation encoder, returning to the NXT the position of the shaft with 1° resolution. Because of the special connector of this motor (non-standard phone plug type), a cable adapter is required to drive this motor with regular 9V sources. Not recommended for use with a RCX which can't deliver the high current that this motor can consume. Slow rotation speed, minimizing the need of external gear train.

    Power Functions Medium motor

    This motor belongs to a new range of motors and control elements introduced in 2007, the Power Functions. It uses a new 4 pins 9V connector that provides permanent 9V supply to control elements as well as controlled power to the motors (compatibility with old 9V system is built in extension cords). The Medium motor has holes for studless constructions as well as 6x2 bottom plate.

    Power Functions XL motor

    Big brother of Power Functions Medium motor, it provides a lot of mechanical power. Actuated by the same core as NXT motors, it rotates slightly faster (less internal gear reduction). Mounting is done through several pin holes.

    9V Train motor

    Stefan Vorst measured performances of the 9V Train motor. The results are below.

    RC Train motor

    This motor was introduced when LEGO stopped the 9V train with metal tracks. The performances of this motor are... not so good.

    Power Functions Train motor

    As the train system unifies with Power Functions, this motor , equipped with a PF cable and connector, replaces the RC train motor. Fortunately the performances are much improved, with an efficiency and power even exceeding the old 9V train motors.

    Power Functions E-motor

    Introduced with LEGO Education Renewable Energy Add-On Set (9688), the strong point of this motor is that it can be easily back-driven and used as a generator. Its high speed may be also useful in some applications. But its efficiency is no better than PF-Medium, and delivered mechanical power is about half.

    Weight


      2838


      2986


      71427


      43362


      5292


      47154

      48g

      10g

      42g

      28g

      55g

      40g


      NXT


      PF Medium


      PF XL


      9V Train


      RC Train


      PF Train


      E-Motor

      80g

      31g

      69g

      72g

      53g

      57g

      50g

    Supposed to be equivalent to 71427, 43362 motor is 30% lighter. This is generally an advantage, except when the motor is used as a counterweight, or to balance the structure, for example in COG-shifting walkers.


    No-load characteristics

    Test conditions: motor is powered by a variable, regulated power supply. An ammeter measures current flowing through the motor, a voltmeter monitors tension across. The rotation speed is measured by a RCX equipped with a light sensor, looking at an half-white/half black cylinder.

    9 V supply


    2838


    2986


    71427


    43362


    5292


    47154

    Stalled torque

    0.85 N.cm

    1.6 N.cm

    6 N.cm

    5.5 N.cm

    12 N.cm

    6 N.cm

    Stalled current

    700 mA

    80 mA

    360 mA

    340 mA

    3.2 A

    580 mA




    9 V supply


    NXT


    PF Medium


    PF XL


    9V Train


    RC Train


    PF Train


    E-Motor

    Stalled torque

    50 N.cm

    11 N.cm

    40 N.cm

    2.8 N.cm

    1.7 N.cm

    3.6 N.cm *

    3.4N.cm

    Stalled current

    2 A

    850 mA

    1.8 A

    950 mA

    750 mA

    1.3 A *

    410 mA


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