Monitoring system for a passenger conveyor

A monitoring system for a escalator having a motor for driving the escalator and an inverter for supplying current to the motor comprising:

• a current sensor for detecting a current supplied to the motor of the escalator;
• a temperature sensor for detecting a temperature of the motor of the escalator;
• a controller configured to calculate an idle operation motor torque of the escalator during an idle operation of the escalator based on the current and the temperature that is detected during the idle operation;
• calculate a normal operation motor torque of the escalator during a normal operation of the escalator based on the current and the temperature detected during the normal operation;
• and estimate a number of passengers who use the escalator during the normal operation based on a difference between the idle operation motor torque of the escalator and the normal operation motor torque of the escalator.

A method for monitoring a escalator having a motor for driving the escalator and an inverter for supplying current to the motor comprising:

• detecting the current supplied to the motor from the inverter;
• detecting the temperature of the motor;
• calculating an idle operation motor torque of the escalator during an idle operation of the escalator based on the current and the temperature that is detected during the idle operation;
• calculating a normal operation motor torque of the escalator during a normal operation of the escalator based on the current and the temperature that is detected during the normal operation;
• and
• estimating the number of passengers who use the escalator during the normal operation based on a difference between the idle operation motor torque and the normal operation motor torque.

A method for monitoring a escalator having a motor for driving the escalator and an inverter for supplying current to the motor comprising:

• detecting a current supplied to the motor of the escalator from the inverter;
• detecting a temperature of the motor of the escalator;
• calculating an idle operation motor torque of the escalator during an idle operation of the escalator based on the current and the temperature that is detected during the idle operation;
• calculating a normal operation motor torque of the escalator during a normal operation of the escalator based on the current and the temperature that is detected during the normal operation;
• estimating a number of passengers who use the escalator during the normal operation based on a difference between the idle operation motor torque of the escalator and the normal operation motor torque of the escalator;
• and
• determining whether a fault exists in the escalator by comparing the idle operation motor torque with a reference motor torque.