The subject matter of this specification can be embodied in, among other things, an electric motor health monitoring system that includes an estimator module configured to model one or more estimated motor values of an electric motor based on one or more motor control parameters and one or more motor control states, a non-transitory computer readable medium, and a fault detector module configured to (1) provide a fault signal based on the modeled one or more estimated motor values of the motor and a predetermined parameter threshold value, and (2) modify the non-transitory computer readable medium based on the fault signal.

A fan detection chip, a fan detection method and a fan detection system are disclosed. In the fan detection system, a fan includes a power terminal and a speed signal terminal, and optionally includes a PWM signal terminal; a power supply module provides a driving voltage to the fan, a PWM signal generating module provides a first PWM signal and a second PWM signal which respectively have different duty cycles, a current sensing module respectively senses a first current and a second current flowing from the power supply module, and a control module compares the first current and the second current. The control module determines the fan to be a PWM fan when the first current is different from the second current, and the control module determines the fan to be a DC fan when the first current is the same as the second current.

A fan detection chip, a fan detection method and a fan detection system are disclosed. In the fan detection system, a fan includes a power terminal and a speed signal terminal, and optionally includes a PWM signal terminal; a power supply module provides a driving voltage to the fan, a PWM signal generating module provides a first PWM signal and a second PWM signal which respectively have different duty cycles, a current sensing module respectively senses a first current and a second current flowing from the power supply module, and a control module compares the first current and the second current. The control module determines the fan to be a PWM fan when the first current is different from the second current, and the control module determines the fan to be a DC fan when the first current is the same as the second current.

The subject matter of this specification can be embodied in, among other things, an electric motor health monitoring system that includes an estimator module configured to model one or more estimated motor values of an electric motor based on one or more motor control parameters and one or more motor control states, a non-transitory computer readable medium, and a fault detector module configured to (1) provide a fault signal based on the modeled one or more estimated motor values of the motor and a predetermined parameter threshold value, and (2) modify the non-transitory computer readable medium based on the fault signal.