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.

A driver circuit for generating a sequence of pulses of a drive voltage from a supply voltage is described. The drive voltage is used for operating an electrical actuator, such as an electrical engine or machine. The driver circuit comprises means for providing an amplitude indication of an amplitude of the supply voltage, which is used for generating a first pulse of the sequence of pulses. Furthermore, the driver circuit comprises an integration unit configured to integrate the amplitude indication for a duration of the first pulse, thereby generating an integrated voltage. In addition, the driver circuit comprises a comparator configured to compare the integrated voltage with a reference voltage, thereby generating a comparator signal. Furthermore, the driver circuit comprises a control unit configured to terminate the first pulse in dependence of the comparator signal.

A rotating electric machine control device includes: a q-axis PI controller calculating a pre-restriction q-axis voltage instruction value based on a q-axis voltage detection value and a q-axis current instruction value; a first q-axis restricter calculating a post-restriction q-axis voltage instruction value by restricting the pre-restriction q-axis voltage instruction value, for an excess of output exceeding a maximum outputtable voltage V_max; a correction value calculator calculating a q-axis correction value that has a reverse phase of a ripple current of a q-axis current; and a corrector correcting the post-restriction q-axis voltage instruction value with the q-axis correction value. In such manner, even when the pre-restriction q-axis voltage instruction value is saturated, a ripple current is reduced, thereby reducing a sound and/or a vibration caused by the ripple 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.