FAQ for tubular linear motors

  1. Are linear motors difficult to integrate into a machine with ballscrews?

    Not difficult, just a little different. Tubular linear motors is simpler to install, as it replaces the ball screw, nut,end bearings, motor mount, couplings, and rotary motor. Alignment of the tubular linear motor is not critical when used without linear bearings and consists of mainly ensuring there is some clearance between the forcer and shaft over the entire travel.

  2. Can a tubular linear motor be mounted vertically?

    Yes, a linear motor provides the same performance when mounted vertically or horizontally. However, it is recommended that a vertically mounted motor be counterbalanced.

  3. Are versions of the S series available for use in waterproof, vacuum or clean rooms?

    Yes, the tubular linear motor can be built for a variety of operating environments. To determine if and which motor is suitable for a specific application, an applications engineer must review the specifications.

  4. Can more than one forcer be used with a single shaft?

    Yes, more than one forcer can be used in conjunction with a single shaft as long as the forcers do not physically interfere with each other. Two forcers may also be tied together and driven with one drive to double the output force.

  5. Do magnets ever lose their magnetism over time?

    The tubular linear motor use a rare earth magnet, which will maintain their strength for 99 years. However, when operating at high temperatures (>180°C), these rare earth magnets can lose strength. Lower temperatures have no effect the magnets as long as frost does not form in the air gap.

  6. How accurate are tubular linear motors?

    By eliminating the conversion of rotary to linear motion, a major source of positioning error is removed. This results in high performance and accuracy. While the motor itself does not have inherent resolution, position accuracy is ultimately determined by the linear encoder feedback accuracy and the core stiffiness of the tubular linear motor. Testing has shown that with encoder resolutions less then 10nm, the motor will, at worst case, enable a position accuracy of ±1.2 pulses of encoder resolution. This position accuracy is not affected by the expansion and contraction of the shaft.