Positioning System HIWIN - Industrial Technologies

Индастриал Технолоджис www.ind-techno.com.ua +38 044 498 21 94Force constant K f(also see Chapter 1.3, K f )This is the winding-specific parameter used to calculate the resultant forceas F = I × K f by multiplication with the input current.Attraction force F aThis force is created between the primary and secondary parts of iron-core linearmotors, by biasing voltage of the drive system, which must then be taken upby the guide.Motor constant K m(also see Chapter 1.3, K m )This designates the ratio of generated power and dissipation powerand consequently is a measure for efficiency of a motor.IncrementThis, or the smallest increment, is the minimum stroke that a linear drive cantravel repeatedly. It is determined by the >resolution of the linear drive plus theincrement of the motor and all errors in the drive line (reverse play, winding etc.)Peak torque, peak force F pThe 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 pand is significant especially during acceleration and braking.Peak current I p(also see Chapter 1.3, I p )It is used for short-term generation of peak power. HIWIN defines peak currentas follows: Iron-core motors and coreless motors have three times the permittedcontinuous current as Ip. The maximum permitted length of peak current isone second. Thereafter, the motor must cool down to the nominal temperaturebefore peak current can be supplied again.Multi-IndexOne incremental track is arranged on the scale. The sensor in the encoder headreads out 3 signals: incremental tracks A and B and Z-track for the internalreference signal. Each reference mark on the scale creates a reference signal(multi-index). An external reference switch is essential to trigger the referencesignal. After operating the external reference switch the next reference mark onthe magnetic scale defines the reference signal.Single-IndexThe magnetic scale is split in two tracks, incremental track and reference-track.Depending on the specification one or several reference marks are on the index rackare arranged on scale.In the sensor are two sensor heads integrated. One for the tracks A and B and one forthe reference track. Single-index-scales are always custom-made.StiffnessThis corresponds to the mechanical deformation resistance that a component or assemblyhas against a static external load in a steady-state, static state (static stiffness)or the elastic deformation resistance that a component or assembly has againsta dynamic force working from the outside (dynamic stiffness).WobblingThis is the angle deviation in the rotation axis from rotary tables during rotationalmovements, i.e. tipping of the surface of a rotary table. The causes are mainlytolerances in the bearing.Winding resistance R 25This is the winding-specific dimension that is produced by the winding resistanceat 25 °C winding temperature . At 80 °C winding temperature, the winding resistanceincreases to approximately 1.2 × R 25.Winding temperature T max(also see Chapter 1.3, T)This is the permitted winding temperature. The actual motor temperature is dependenton the installation, cooling and operating conditions and consequently can only bedetermined in an actual case and cannot be calculated.RepeatabilityThis may not be confused with absolute preciseness. A linear axis can have slightpreciseness, but high repeatability. The uni-directional repeatability is measuredwhen there is movement to a target position from an appropriately large stroke inthe 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 targetposition is driven from different movement directions; doing this the other wayaround does not work.Industrial Technologies3