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Parameter
Temperature Cut-off sensor
Temperature Sensor
Thermal resistance
Thermal time constant
Ultimate current
Ultimate force @ 10°C/s increase
V ac RMS
V dc
Watercooling flow
Watercooling pressure drop
Winding type
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Glossar
Bemerkung
Sym
Einheit
Definition
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.
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.
coils to
R
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]
th
mounting
x [Watt] = [C] Temperature of the coil unit.
surface
to 63% of
τ
S
Time [Sec] required for the coilwindings to reach [(1-(1/e))=63%] of their maximum temperature during continuous force.
th
maximum
temperature
magnet @
I
A
The ultimate current [A] the motor can be run at to achieve the specified ultimate force.
u
rms
25°C
magnet @
F
N
The force generated by the motor beyond the saturation point in the non linear area of the Motor Force Constant. The actual value
u
25°C
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.
The effective value of a Sine shaped alternating current voltage.
The direct current bus voltage can be calculated from the AC supply voltage by multiplication Vdc=Vac rms x (sqrt2).
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.
order of
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
magnitude
hoses and nipples of the entire system are not included.
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.
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GLOSSAR
GL
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