Positioning systems ( complete program ) - HIWIN - #9

This is the winding-specific parameter used to calculate the resultant force as F = I x K_f by multiplication with the input current.

This force is created between the primary and secondary parts of iron-core linear motors, by biasing voltage of the drive system, which must then be taken up by the guide.

This designates the ratio of generated power and dissipation power and consequently is a measure for efficiency of a motor.

This, or the smallest increment, is the minimum stroke that a linear drive can travel repeatedly. It is determined by the resolution of the linear drive plus the increment of the motor and all errors in the drive line (reverse play, winding etc.)

The peak torque (for rotational movements) or the peak force (for linear movements) is the maximum force that a motor can generate for approximately one second. With HIWIN, it is at the end of the linear modulation range at peak current I_p and is significant especially during acceleration and braking.

It is used for short-term generation of peak power. HIWIN defines peak current as follows: Iron-core motors have double the peak current I_p as Ip, coreless motors have

three times the permitted continuous current as Ip. The maximum permitted length of peak current is one second. Thereafter, the motor must cool down to the nominal temperature before peak current can be supplied again.

This corresponds to the mechanical deformation resistance that a component or assembly has against a static external load in a steady-state, static state (static stiffness) or the elastic deformation resistance that a component or assembly has against a dynamic force working from the outside (dynamic stiffness).

This is the angle deviation in the rotation axis from rotary tables during rotational movements, i.e. tipping of the surface of a rotary table. The causes are mainly tolerances in the bearing.

This is the winding-specific dimension that is produced by the winding resistance at 25 °C winding temperature . At 80 °C winding temperature, the winding resistance increases to approximately 1.2 x R₂₅

This is the permitted winding temperature. The actual motor temperature is dependent on the installation, cooling and operating conditions and consequently can only be determined in an actual case and cannot be calculated.

This may not be confused with absolute preciseness. A linear axis can have slight preciseness, but high repeatability. The uni-directional repeatability is measured when there is movement to a target position from an appropriately large stroke in the same direction several times; doing this the other way around does not work. In the measurement of bi-direction repeatability, there is movement to a target position is driven from different movement directions; doing this the other way around does not work.