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Ironless linear mot
or manual - v
er
. 1.03
©2016 Tecnotion BV - All rights reserved - The contents of this document are subject to change without prior notice.
GLOSSARY GL
Glossary
Parameter Remark Sym Unit Definition
Synchronous motor A motorsystem with a linear relation between the currentfrequency and the movement frequency.
Temperature Cut-off sensor A cut-off sensor is used to protect the motor from damage due to overheating. The sensor has a positive coefficient between
temperature and resistance. Near 110°C the resistance increases exponentially. The sensor output can be used as input for the
controller to shut off the current to prevent damage to the coils.
Temperature Sensor Ohm/C A temperature sensor can be used for monitoring the coil temperature. Iron core motors are fitted with KTY sensors Ironless
sensors are fitted with a NTC sensor.
Thermal resistance coils to
mounting
surface R
th
C/W Defines how warm the coil unit will become as a result of the dissipation of power to the surface. Rtherm x dissipated power =
[°C/W] x [Watt] = [C] Temperature of the coil unit.
Thermal time constant to 63% of
maximum
temperature τ
th
S Time [Sec] required for the coilwindings to reach [(1-(1/e))=63%] of their maximum temperature during continuous force.
Ultimate current magnet @
25°C I
u
A
rms
The ultimate current [A] the motor can be run at to achieve the specified ultimate force.
Ultimate force @ 10°C/s increase magnet @
25°C F
u
N The force generated by the motor beyond the saturation point in the non linear area of the Motor Force Constant. The actual
value of the Motor Force Constant at Ultimate Force is 26% less then the linear value. This is only applicable for Iron core motors.
Transfer efficiency of current to force is lower and causes the coils to heat up faster. For ultimate force the temperature increase is
10°C/s.
V ac RMS The effective value of a Sine shaped alternating current voltage.
V dc The direct current bus voltage can be calculated from the AC supply voltage by multiplication Vdc=Vac rms x (sqrt2).
Watercooling flow for ∆T=3K ΦW L/min Volume of water at 20°C per minute that will create a ∆T of 3K between entrance and exit of the coilunit. At a different flow rate
the delta T will be different.
Watercooling pressure drop order of
magnitude ΔPw bar Drop in pressure over the in and outlet of the coils caused by friction forces in the watercooling channels. The pressure drop over
the hoses and nipples of the entire system are not included.
Winding type The winding type determines the relation between maximum speed, force, required current and bus voltage of the coil. N type
windings are optimised for normal currents and regular busvoltages. S type windings are optimised for higher speeds and / or
lower busvoltages. The S type winding requires higher currents. The available forces are winding type independent.