Temperature Monitoring And Motor Protection - Hiwin TM-2 Series Installation Manual

MW99UE01-2104
Torque Motor Installation Manual
PTC100 and PTC120(130) are thermistors. Their output resistance changes according to coil
temperature. Resistance of PTC100 rises drastically when T
rises drastically when T
20

4.10.1 Temperature monitoring and motor protection

To protect the motor windings against thermal damage, every motor is equipped with a triple positive
temperature coefficient (PTC) sensor, type SNM120/130 (in accordance with DIN 44082-M180). Since
the degree of heating of the individual motor phases can be very different, a PTC sensor is fitted in each
phase winding (U, V and W). Each PTC element has a "Quasi-switching" characteristic, i.e. the resistance
suddenly increases close to the rated temperature (switching threshold, Figure 4.26). Due to its low heat
capacity and good thermal contact with the motor winding, the PTC reacts very quickly to a rise in
temperature and, in conjunction with additional protective mechanisms on the control side, ensures
reliable motor protection against overload. The PTC elements located in every phase winding in HIWIN
motors are wired in series; they connect via two wires.
With TMRW/TM-2/IM-2 there is an additional temperature circuit with positive temperature coefficient
(PTC), type SNM100, for redundant use or to distinguish between warning and danger temperatures.
4-32
=120(130) ℃. Their features are given in Table 4.22 and Figure 4.26.
REF
Table 4.23 Features of PTC
Features of
℃
<T<T - 20K
REF
T=T - 5K
REF
T=T + 5K
REF
T=T + 15K
REF
Ω
Resistance( )
Figure 4.26 Relationship between PTC temperature and resistance
=100℃, while resistance of PTC120(130)
REF
Resistance 3 series resistors
Ω Ω
20 ~250
Ω
≦ 550
Ω
≧ 1,330
Ω
≧ 4,000
℃
Temp.(
Motor Interface Design
Ω
60Ω~750
Ω
≦ 1,650
Ω
≧ 3,990
Ω
≧ 12,000
)
HIWIN MIKROSYSTEM Corp.