Energy saving and sustainability have become hot topics nowadays. Electric transportation applications, such as electric vehicles, always pursue higher energy efficiency other than applications with secured power sources. Therefore, lots of research and development work have been carried out to pursue the energy efficiency, such as redesign the motor itself and/or, use electronic techniques. This invention deploys electronic techniques to pursue higher efficiency. To prove the idea and solutions, 2 prototypes using 2-phase and 3-phase PMBLDC motors have been built for the purpose. They disclose the methods to catch the residual energy from an armature and send it back to the rechargeable power sources without affecting the motor's running driven by switching manner. The implementation is simple and cheap. By recycling the residual energy, it extends the run time of battery systems, achieving higher energy efficiency. The benefit is huge, but not limited to, in economical and environmental fields.

Disclosed is a system and method for power line control of electrical fans. The system generates a sinusoidal wave using a crystal oscillator. Control information is added to the sinusoidal wave by routing the wave through a phase inversion circuit a predetermined intervals according to a protocol. The resulting control signal is sent on a power line. The control signal is received using a crystal filter, decoded and converted to executable instructions for controlling a fan motor.

Disclosed is a system and method for power line control of electrical fans. The system generates a sinusoidal wave using a crystal oscillator. Control information is added to the sinusoidal wave by routing the wave through a phase inversion circuit a predetermined intervals according to a protocol. The resulting control signal is sent on a power line. The control signal is received using a crystal filter, decoded and converted to executable instructions for controlling a fan motor.

According to various embodiments, an electronic device may comprise a housing, a plate coupled to the housing to reciprocate, a flexible display including a first portion disposed on the plate and a second portion extending from the first portion and exposed to an outside or retracted into an inside of the housing as the plate reciprocates, a motor configured to move the plate, at least one electronic component, a battery, and at least one processor. The at least one processor may be configured to identify an event for triggering a movement of the plate, identify a first power of the battery and a second power for controlling the flexible display and the at least one electronic component, based on the event, identify a third power for controlling the motor, based on the first power and the second power, and provide the motor with a signal corresponding to the third power.

According to various embodiments, an electronic device may comprise a housing, a plate coupled to the housing to reciprocate, a flexible display including a first portion disposed on the plate and a second portion extending from the first portion and exposed to an outside or retracted into an inside of the housing as the plate reciprocates, a motor configured to move the plate, at least one electronic component, a battery, and at least one processor. The at least one processor may be configured to identify an event for triggering a movement of the plate, identify a first power of the battery and a second power for controlling the flexible display and the at least one electronic component, based on the event, identify a third power for controlling the motor, based on the first power and the second power, and provide the motor with a signal corresponding to the third power.

The invention provides a motor nonlinear system modeling method including steps of: obtaining a chirp signal of a first frequency band, and a chirp signal of a second frequency band; exciting the motor by using the chirp signal; obtaining a higher harmonic frequency response of the first frequency band; exciting the motor by using the chirp signal of the second frequency band; obtaining a higher harmonic frequency response of the second frequency band; obtaining a higher harmonic frequency response by splicing the higher harmonic frequency response of the first frequency band and the higher harmonic frequency response of the second frequency band in the frequency domain. The higher harmonic frequency response of the working frequency of the motor is a nonlinear system model of the motor. By virtue of the method provided by the present invention, the accuracy of motor modeling is effectively improved.

The invention provides a motor nonlinear system modeling method including steps of: obtaining a chirp signal of a first frequency band, and a chirp signal of a second frequency band; exciting the motor by using the chirp signal; obtaining a higher harmonic frequency response of the first frequency band; exciting the motor by using the chirp signal of the second frequency band; obtaining a higher harmonic frequency response of the second frequency band; obtaining a higher harmonic frequency response by splicing the higher harmonic frequency response of the first frequency band and the higher harmonic frequency response of the second frequency band in the frequency domain. The higher harmonic frequency response of the working frequency of the motor is a nonlinear system model of the motor. By virtue of the method provided by the present invention, the accuracy of motor modeling is effectively improved.

Disclosed according to embodiments are a motor control device and a fault diagnosis method using the same. The motor control device includes a first reception circuit which receives a first input signal through a first signal line, a second reception circuit which receives a second input signal through a second signal line, a sensing circuit which is connected to the first signal line and the second signal line and outputs a state output value which varies according to whether the second signal line is opened, and a micro control unit (MCU) which receives the state output value output from the sensing circuit and determines whether the second signal line is opened using the received state output value.

A motor control system includes a direct current (DC) motor and a ripple count circuit. The DC motor includes a rotor induced to rotate in response to a drive current generated by a supply voltage. The rotation of the rotor generates a mechanical force that drives a component. The ripple count circuit includes an active filter circuit and a parasitic pulse cancellation circuit. The active filter circuit is configured to filter the drive current and to generate a pulsed signal containing at least one parasitic pulse. The parasitic pulse cancelation circuit is in signal communication with the ripple count circuit to receive the pulsed signal and to output a ripple count signal based on the pulsed signal. The ripple count signal excludes the at least one parasitic pulse.

A motor control system includes a direct current (DC) motor and a ripple count circuit. The DC motor includes a rotor induced to rotate in response to a drive current generated by a supply voltage. The rotation of the rotor generates a mechanical force that drives a component. The ripple count circuit includes an active filter circuit and a parasitic pulse cancellation circuit. The active filter circuit is configured to filter the drive current and to generate a pulsed signal containing at least one parasitic pulse. The parasitic pulse cancelation circuit is in signal communication with the ripple count circuit to receive the pulsed signal and to output a ripple count signal based on the pulsed signal. The ripple count signal excludes the at least one parasitic pulse.