Provided is a safety power window controlling method including an operation in which a ripple current detector detects a ripple current by removing high-frequency noise from an output current signal of a four-pole stator motor; an operation in which an amplifier receives a ripple current as a first input signal, receives a reference voltage as a second input signal, and outputs an amplified current signal obtained by amplifying the first input signal to a level of the reference voltage; and detecting the amplified current signal output by the amplifier as a valid signal by using at least two preset reference values.

A system according to the present disclosure includes a motor driver module and a motor position determination module. The motor driver module is configured to measure current supplied to a motor. The motor position determination module is configured to determine a first position of the motor at a first time when power supply to the motor is initially discontinued based on ripples in the current supplied to the motor during a first period before the first time. The motor position determination module is configured to determine a second position of the motor at a second time when the motor stops rotating after power supply to the motor is discontinued based on the first position of the motor and a rotational speed of the motor at the first time.

A hydraulic fracturing system for fracturing a subterranean formation includes a support structure that includes an electric powered pump, arranged in a first area, the electric powered pump powered by at least one electric motor, also arranged in the first area. The system further includes a variable frequency drive (VFD), arranged in a second area proximate the first area, connected to the at least one electric motor to control the speed of the at least one electric motor. The system includes a transformer, arranged in a third area proximate the second area. The system also includes a slide out platform integrated into the first area, the slide out platform being driven between a retracted position and a deployed position.

A board of a controller of a load drive device includes: wiring layers provided on front and rear surfaces and inside thereof and ground layers provided inside thereof. Each wiring layer is divided into: a first region in which a drive circuit is provided; and a second region in which a control circuit is provided. A first ground layer including a first ground pattern for a circuit which is electrically connected to a wiring pattern of each wiring layer is divided into: a third region which overlaps with the first region in a thickness direction, and in which the first ground pattern for a power system electrically connected to the drive circuit is provided, and a fourth region which overlaps with the second region in the thickness direction, and in which the first ground pattern for a control system electrically connected to the control circuit is provided.

A motor driving control device, together with a controller, included in a motor driving system, has a control circuit controlling drive of a motor according to instruction information transmitted from the controller. The control circuit has a first acquisition unit acquiring setting reference information related to assignment of identification information for the motor driving control device itself, the setting reference information being input from outside, a setting unit setting the motor driving control device's identification information based on a magnitude of a setting voltage input from the outside and the setting reference information, and a second acquisition unit acquiring the instruction information based on the identification information set by the setting unit.

A power tool/battery pack combination includes an electric motor, one or more electrochemical cells, and a capacitive element. The electric motor is connected in series to a first switch. The series combination of the electric motor and the first switch is connected to a first terminal and a second terminal. The one or more electrochemical cells are connected across a third terminal and a fourth terminal. The third terminal and the fourth terminal are coupled respectively to the first terminal and the second terminal. The one or more electrochemical cells supply power to the electric motor via the first switch. The capacitive element includes one or more capacitors. The capacitive element is connected across the third terminal and the fourth terminal. The capacitive element is capable of storing inductive energy generated by the one or more electrochemical cells.

A power tool/battery pack combination includes an electric motor, one or more electrochemical cells, and a capacitive element. The electric motor is connected in series to a first switch. The series combination of the electric motor and the first switch is connected to a first terminal and a second terminal. The one or more electrochemical cells are connected across a third terminal and a fourth terminal. The third terminal and the fourth terminal are coupled respectively to the first terminal and the second terminal. The one or more electrochemical cells supply power to the electric motor via the first switch. The capacitive element includes one or more capacitors. The capacitive element is connected across the third terminal and the fourth terminal. The capacitive element is capable of storing inductive energy generated by the one or more electrochemical cells.

A window control device for a vehicle, and a method therefor, include a driving motor configured to drive a window glass, a first sensor configured to generate one pulse signal corresponding to a rotation of the driving motor, a second sensor configured to sense a voltage signal provided to the driving motor, and a controller configured to perform a safety function based on the one pulse signal generated by the first sensor and the voltage signal sensed by the second sensor. Although a fault occurs in one of two hall sensors, the window control device may normally perform the safety function.

A window control device for a vehicle, and a method therefor, include a driving motor configured to drive a window glass, a first sensor configured to generate one pulse signal corresponding to a rotation of the driving motor, a second sensor configured to sense a voltage signal provided to the driving motor, and a controller configured to perform a safety function based on the one pulse signal generated by the first sensor and the voltage signal sensed by the second sensor. Although a fault occurs in one of two hall sensors, the window control device may normally perform the safety function.

An electrical sander structure has a main body, a control mechanism and a control circuit. The main body has a brushless motor, and an electromagnetic coil in the brushless motor has a slotted concentrated winding brushless DC motor design. The control circuit is further includes a power detecting module, a rated power constraint module, an intelligent temperature control protection module and a rotation control module. The brushless motor is able to adjust the speed according to the load variations and intelligent temperature control protection mechanism, maintain the optimal operating efficiency and continuously operate within the power set by the rated power limit. In turn, the brushless motor can operate at optimum operating efficiency, helping to extend the life of the brushless motor, increasing user productivity and reducing energy losses.