App-Linear motor terms

LINEAR MOTOR

Linear motor - Glossary Of Terms

 

Continuous Force (Fc)

The force produced by continuous current (Ic), with linear motor coil is attached to an adequate heatsink as specified. At continuous force motor temperature equal to the maximum temperature rating of the forcer

 

Peak Force (Fp)

The force produced by peak current (Ip) for duration of 1 second

 

Motor Force Constant (Kf)

This is a figure of merit for linear motor efficiency. Defines how much force is produced per unit of current. It is the ratio of the continuous force Fc to the continuous current

 

Max Power Dissipation (Pc)

The continuous power losses of the linear motor with the continuous current Ic applied to the coil, when motor reached max temperature rating of the forcer with the ambient temperature at 20 deg C

 

Maximum Coil Temperature (Tmax)

The maximum rated temperature of the coil  120 deg C. However, good practice is to limit the continuous current to no more than 80% of the rated continuous current

 

Back EMF Constant p-p (Ke)

The ratio between the back emf voltage in volt peak to the linear motor speed

 

Peak Current (Ip)

The magnitude of the 3 phase sinusoidal currents that need to be applied to the linear motor to develop the motor peak force (Fp).

 

Continuous Current (Ic)

The continuous current corresponding to the continuous Force

 

Resistance l-l @ 20 deg C

This is the cold coil resistance measured phase to phase (line to line) at 20 deg C

 

Inductance l-l (L)

This is the coil inductance measured phase to phase (line to line)

 

Magnetic Attraction (Fm)

The magnetic attraction force exerted between the linear motor coil assembly and its magnet assembly, measured at the nominal air gap.

 

Forcer Mass (Mc)

The mass of the linear motor coil including the standard cable length. For air cooled and water cooled motors it also includes the mass of the cooling tube or cooling plate

 

Magnetic Track Mass (Mm)

The mass of the magnetic track per unit of length.