Definitions and technical terms

This chapter provides information on various technical terms and their meaning.

	Consider validity framework All data, with the exception of the voltage constant, are based on 40°C ambient temperature and 100 K overtemperature of the winding. The data can have a tolerance of ±10%.

Stroke [mm]

Maximum possible travel of the spindle.

Peak force F_max [N]

Maximum force delivered by the electric cylinder when operated with peak current.

Notice

Thermal overload due to peak current

It is imperative that you adhere to the specified peak force, as it may be mechanically determined. Avoid thermal overload by

periodically read the winding temperature.
if necessary, allow for breaks to cool down.

Peak current I_max [A_RMS]

Sinusoidal peak current RMS value. The configured peak current of the servo drive used must be less or equal.

Continuous force F₀ [N]

Force that the electric cylinder can apply at standstill. It can be maintained indefinitely at a velocity v < 0.05 m/s and nominal environmental conditions.

Continuous current I₀ [A_RMS]

Sinusoidal current RMS value. This is taken up at a velocity of v < 0.05 m/s in order to deliver the continuous force.

Peak velocity v_max [m/s]

Maximum velocity that the electric cylinder can deliver. The value may be mechanically caused and must therefore be adhered to.

Nominal force F_n [N]

Force delivered by the electric cylinder when operated at nominal velocity and nominal current. Can be delivered indefinitely in continuous operation S1 and depends on the external load applied.

Force constant k_F [N/A_RMS]

Indication of how much force the motor generates per ampere with the standstill current. The following applies: F₀= I₀x k_F.

Voltage constant
k_E [mV_RMS/min^-1]

Indication of the induced motor EMF at 20°C, based on 1000 rpm. This is specified as the sine RMS value between two terminals.

Moment of inertia J [kgcm²]

Measure of the acceleration capacity of the electric cylinder.

Release delay time of
brake t_brh [ms]

Specification of the response time of the holding brake [+] when operated with the nominal voltage.

Winding inductance L [mH]

Indication of the motor inductance. It is the mean value for one motor revolution, with two energized phases, at 1 kHz. Saturation of the electric cylinder must be taken into account.

Lead p [mm]

Lead of the spindle used. One revolution corresponds to a linear movement that amounts to the length of the lead.

Mechanical efficiency η [%]

Summary of all mechanical losses in the electric cylinder. This can be higher under certain circumstances and is variable to a small extent over the useful life.

Dynamic load rating C_dvn [kN]

The axial force that a ball screw can theoretically support with a nominal service life of 10⁶ revolutions.

Heat input Q [W]

Proportion of the maximum power loss that is dissipated via the connection surface.

Temperature flange surface u [°C]

Maximum temperature of the flange surface when heat input Q is applied.

Warning temperature t_w [°C]

Maximum permissible temperature of the stator winding [Motor warning temperature]. When this threshold is exceeded, the software issues a temperature warning.

Switch-off temperature t_S [°C]

Critical threshold of stator winding temperature [Motor shut down temperature]. When this threshold is exceeded, the software switches off the electric cylinder.