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Tecnotion
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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
Parameter
Remark
Sym
Unit
Definition
Magnetic pitch NN
τ
mm
The distance between two consecutive poles of the same polarity.
Magnets @ 25°C
Temperature at which the specified force is rated. Permanent magnets have a negative temperature coefficient. At higher
magnet temperatures the achievable force will be lower. Permanent magnets will start to demagnetise at a specific temperature
and applied external magnetic loads. For Tecnotion standard motors this will occur around 60°C. At the specified 25°C this
demagnetisation will not occur.
Maximum continuous current
see Continuous current aircooled.
Maximum continuous power loss
all coils
P
c
W
The maximum amount of power in [Watt] that is dissipated when the motor is operated at continous force. The actual value can
be lower as a result of variations in thermalresistance, coil temperature and winding resistance. The winding resistance Rph
increases with the temperature according to Rph_∆T= Rph*(1+α x ∆T). With α being the temperature coefficient for copper [1/K]
and ∆T the temperature increase in [K].
Maximum speed
@560V
v
max
m/s
The maximum speed the linear motor can achieve at continous force. The actual value depends on the busvoltage and required
force. Please check the Force/ Velocity diagrams in the Tecnotion Simulation tool.
Motor attraction force
RMS @ 0A
F
a
N
The motor attraction force for an unpowered Ironcore motors. The value increases when the motor is powered. At maximum
current the attraction force increases by approximatly 10%.
Motor Constant
coils @25°C
S
N
2
/W
Ratio between force in Newton and dissipated heat in Watts [N^2/W]. A higher value of the constant implies that the motor
dissipates less heat for the generation of a certain amount of force. The value decreases at higher coil temperatures. This is
caused by increased Rph-ph winding resistance. S=(K^2/(3*Rph-ph).
Motor Force constant
mounting
surface @ 20°C
K
N/A
rms
[N/Arms] Ratio between generated force in Newton and applied RMS current in Ampere. This value is completely linear for
Ironless linear motors. Ironcore linear motors express a linear characteristic untill a saturation point. Beyond this point the ratio is
no longer constant.
NTC temperature sensor
Ohm/C
The temperature sensors for the Ironless series. This sensor has no ferromagnetic components to prevent any attraction forces
within the magnet yoke. This sensor has a negative coefficient between temperature and resistance.
Peak current
magnet @
25°C
L
p
A
rms
The peak current [A] the motor can be run at to achieve the specified peak force.
Peak force @ 20°C/s increase
magnet @
25°C
Ironless motors lack a saturation point in the Motor Force Constant. The peak force is determined by the tolerated material
expansion due to an increased temperature of the coil. For Ironless motors this increase is at 20°C/s.
Peak force @ 6°C/s increase
magnet @
25°C
F
p
N
For Iron core motors the peak force is the force generated by the motor just beyond the saturation point of the Motor Force
Constant. The actual value of the Motor Force Constant is 14% less then the linear value. The coils will heat up with 6°C/s.
Resistance per phase
coils @ 25°C
excluding
cables
R
ph
Ohm
The resistance value in [Ohm] of one phase or winding of the coil. This value cannot be verified via the motor cables. The double
value will be measured because of the star point configuration of the phases / windings.
Glossary
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