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3 Specifications

3 - 44

G5-series Linear Motors/Servo Drives With Built-in EtherCAT Communications

Ironless Linear Motors have one PTC thermistor in its Motor Coil Unit.

This PTC thermistor has a characteristic that the resistance increases suddenly at around 110

ºC.

Utilize this characteristic to build a circuit to stop the motor in case of overheating.

Be sure to build a circuit that detects overheating at a resistance at around 90

ºC to 100ºC, so that the

maximum coil temperature 110

ºC allowed for the Motor Coil Unit is not exceeded.

Ironless Linear Motors also have another NTC thermistor for measuring the average Motor Coil Unit

temperature.

z PTC

Note 1 The resistance value in a low temperature range is approximately 50 Ω.

2 The resistance value increases gradually when the temperature is at over 90ºC.

3 The temperature detected by a PTC thermistor has an error of approximately ±10ºC. Take this error into

account and use the motor at or lower than the maximum temperature allowed for the Motor Coil Unit. The

upper limit temperature is 110ºC.

z NTC

Note The temperature value has an error of ±7 to ±10ºC.

3-3-8 Temperature Sensor Specifications of Ironless Linear Motors

1,000

2,000

3,000

4,000

5,000

6,000

85 90 95 100 105 110 115

Coil Temperature [°C]

Resistance [Ω]