A command generation device according to an exemplary embodiment of the present invention includes a command receiving unit that receives a high-level command value related to motion of a motor from a host device, and an internal target generation unit that generates an internal target value of the motor, including a position target value and a rotational speed target value, based on the high-level command value. The internal target generation unit includes a feedback calculator that generates the internal target value corrected based on a difference between the high-level command value and the internal target value, and generates the internal target value corrected in a cycle shorter than a cycle of receiving the high-level command value with the command receiving unit.

A servo control device for controlling a motor based on a position command when an operation target is connected to the motor via a wave gear reduction mechanism may include a position control system configured to detect a shaft angular position of the motor to perform a closed-loop control based on the shaft angular position; an inverse control element having an inverse characteristic of dynamics of the position control system; and a compensation amount generation unit configured to generate a compensation amount for compensating for an angular transmission error of the wave gear reduction mechanism. The inverse control element is configured to apply compensation amount to the position control system.

A display including a supporting stand and a display panel is provided. The supporting stand has a rotating assembly, a drive motor, and a microcontroller. The display panel has a computing device. The drive motor is connected to the rotating assembly for driving the rotating assembly to rotate. The microcontroller is coupled to the drive motor for controlling the drive motor. The display panel is disposed on the rotating assembly. The computing device is coupled to the microcontroller. The computing device is configured to read an image. The computing device transmits a signal to the microcontroller based on an orientation of the image being portrait or landscape so that the microcontroller switches on the drive motor and the rotating assembly drives the display panel to rotate relative to the supporting stand for switching a rotating position of the display panel to a portrait mode or a landscape mode.

A command generation device according to an exemplary embodiment of the present invention includes a command receiving unit that receives a high-level command value related to motion of a motor from a host device, and an internal target generation unit that generates an internal target value of the motor, including a position target value and a rotational speed target value, based on the high-level command value. The internal target generation unit includes a feedback calculator that generates the internal target value corrected based on a difference between the high-level command value and the internal target value, and generates the internal target value corrected in a cycle shorter than a cycle of receiving the high-level command value with the command receiving unit.

A comparator circuit with a speed control element is disclosed herein. The speed control element may include a variable voltage source and one or more transistors. Using a voltage supplied by the variable voltage source, the one or more transistors may control a swing of a clock signal to provide a swing controlled clock signal to an amplification portion of the comparator circuit. The swing controlled clock therefor may be used to control the speed of the comparator circuit (e.g., an amplification phase) based on a level of noise in the circuit. The swing controlled clock may further be used to align an output common voltage of the comparator circuit with switching voltages of downstream logic cells (e.g., inverters) connected to the comparator circuit.

To provide a characteristic evaluation device that can properly evaluate a characteristic of a shaft coupling while considering a delay in a response of a motor, a characteristic evaluation device of a shaft coupling includes: a motor system including a drive motor, a rotation angle sensor configured to acquire a rotation angle of a drive shaft, and a motor control unit configured to control the drive motor based on a torque command; a rotational load connected to a driven shaft; and a processor configured to output the torque command and calculate a frequency response of a gain of an amplitude of an angular velocity ω of the rotation angle, wherein the processor is configured to calculate a characteristic of the shaft coupling based on a response characteristic of the motor system and the frequency response.

A system and method are disclosed for determining the mechanical angular position of a rotating member of a prime mover which is connected, directly, or indirectly, to an electric machine, such as a permanent magnet synchronous machine or an induction machine. The electrical angular position of the rotor of the electric machine is determined by a sensorless AC motor control system, such as a Field Oriented Control System or back EMF control system, and is used in turn to determine the mechanical angular position of the rotating member.

A display including a supporting stand and a display panel is provided. The supporting stand has a rotating assembly, a drive motor, and a microcontroller. The display panel has a computing device. The drive motor is connected to the rotating assembly for driving the rotating assembly to rotate. The microcontroller is coupled to the drive motor for controlling the drive motor. The display panel is disposed on the rotating assembly. The computing device is coupled to the microcontroller. The computing device is configured to read an image. The computing device transmits a signal to the microcontroller based on an orientation of the image being portrait or landscape so that the microcontroller switches on the drive motor and the rotating assembly drives the display panel to rotate relative to the supporting stand for switching a rotating position of the display panel to a portrait mode or a landscape mode.

A control method for an electric vehicle includes controlling a torque of a motor based on a final torque command value by calculating the final torque command value such that a vibration damping control to reduce vibrations of a driving force transmission system of a vehicle is performed on a target torque command value set based on vehicle information, calculating the final torque command value based on the target torque command value and a value obtained by multiplying a drive-shaft torsional angular velocity by a feedback gain, estimating, by use of a vehicle model that models the driving force transmission system, a dead-zone period during which a motor torque output from the motor is not transmitted to a drive-shaft torque of the vehicle, and determining whether or not the vehicle is just before stop of the vehicle.

A servo control device for controlling a motor based on a position command when an operation target is connected to the motor via a wave gear reduction mechanism may include a position control system configured to detect a shaft angular position of the motor to perform a closed-loop control based on the shaft angular position; an inverse control element having an inverse characteristic of dynamics of the position control system; and a compensation amount generation unit configured to generate a compensation amount for compensating for an angular transmission error of the wave gear reduction mechanism. The inverse control element is configured to apply compensation amount to the position control system.