Abstract: A power tool comprising a housing and a brushless direct-current (BLDC) motor disposed within the housing. The motor includes a stator and a rotor rotatable relative to the stator. The power tool is configured to generate a power output from the motor that is greater than 1200 continuous hot Watts out such that a quotient obtained by the power output measured in Watts (Wout), divided by an input measured in Volt-Amperes (Vain), and further divided by a volume of the power tool measured in cubic centimeters (cc), is greater than 600 Wout/Vain/cc.

Abstract: In an electric power conversion device according to an embodiment, a chopper converts electric power from a power supply into direct-current power. An inverter converts the direct-current power into alternating-current power. Pairs of resonant capacitors are connected to a direct-current input section of the inverter. Each of the pairs is in series. Primary windings of high-frequency transformers are connected to the inverter and respective midpoints of the pairs of resonant capacitors. The high-frequency transformers convert the alternating-current power of the inverter. Rectifiers convert alternating-current power supplied from secondary windings of the high-frequency transformers into direct-current power. One or more voltage detectors detect output voltage of one or more of the rectifiers. A control device controls the chopper on the basis of output of the voltage detectors such that an output voltage of the direct-current power comes to a predetermined voltage value.

Abstract: An automobile electronic parking execution controller with a double-MCU redundancy design comprises a parking switch circuit, a biaxial acceleration sensor unit, a main micro control unit (MCU) U2 and a monitoring MCU U1, wherein the main MCU U2 controls a parking motor by means of detecting signals of the parking switch circuit and the biaxial acceleration sensor, the monitoring MCU U1 monitors a running state of a whole control system and restores the main MCU U2 when the main MCU U2 is abnormal, and the main MCU U2 restores the monitoring MCU U1 when the monitoring MCU U1 is abnormal. After the main MCU U2 crashes, the main MCU U2 can still be quickly stored through the monitoring MCU U1, so that the main MCU U2 quickly enters a response state to recover the parking brake control ability, which improves the safety of the system.

Abstract: A control apparatus includes a drive circuit unit to which regenerative electric power is input, a discharge resistance unit parallel-coupled to the drive circuit unit, to which the regenerative electric power is input from the drive circuit unit, and, when a voltage value of the regenerative electric power exceeds a threshold value, consuming electric power, a second converter circuit unit parallel-coupled to a first converter circuit unit and converting and outputting an alternating current into a direct current, a step-down circuit unit stepping down and outputting a voltage of the current output from the second converter circuit unit, an energization control circuit unit actuated by the direct current and controlling the drive circuit unit, and a regenerative electric power supply unit having a regenerative diode coupled to the discharge resistance unit and outputting a direct current of the regenerative electric power to the step-down circuit unit.

Abstract: A method for controlling a permanent magnet (PM) synchronous motor in an ESP application is provided. A load angle of the PM motor is estimated. A voltage adjustment value is determined for the PM motor based at least on the estimated load angle of the PM motor. A voltage to be applied to the PM motor is determined based on the voltage adjustment value.

Abstract: An electric motor for a pump includes an AC line-in node for receiving AC power supplied to the electric motor. The electric motor includes a current sensor coupled to the AC line-in node and measures current supplied to the electric motor. The electric motor includes a motor controller configured to convert the AC power supplied to a variable frequency variable voltage power for driving the electric motor at a normal output value. The motor controller includes a microcontroller and an inverter. The microcontroller is coupled to the current sensor and receives a measured value of the current supplied to the electric motor, determines the measured value is above a threshold, and transmits a control signal representing a reduced output value. The inverter receives the control signal and generates the variable frequency variable voltage power to reduce output from the electric motor according to the reduced output value.

Abstract: A blood pump system includes a blood pump and a corresponding controller. The blood pump includes an impeller that is sealed within the pump housing and hydrodynamically suspended within the pump housing. The pump impeller includes magnets, and is the rotor of a brushless direct current (DC) motor that is driven by electrical signals through stator wire coils in the pump housing, which creates a rotating magnetic field. The rotating magnetic field attracts the magnetized impeller and spins it with the rotating field. The controller provides field-oriented control for the brushless DC motor in the blood pump. The field-oriented control in the controller is provided in a programmable logic device separate from a control processor so that a software or hardware failure related to the control processor does not stop the blood pump. The field-oriented control allows sensing blood flow through the pump without having sensors in the blood stream.

Abstract: A cyclic power generation and storage system with dynamic battery switching capability is provided, comprising: a power supply modules, a driving module, a transmission module, a plurality of power generation modules, a control module, and a plurality of power storage modules. The present invention can dynamically switch in battery packs to provide a stable power to an electrical device, as well as, switch in a battery or battery pack for recharging with the power generated by the power generation modules. The power storage module having a power management unit, together with the control module, uses the detection result from the power detection unit of the power storage module to dynamically adjust the power generation, distribution, storage, and usage to improve the overall efficiency of the present invention.

Abstract: An example apparatus includes: memory including machine-readable instructions; programmable circuitry configured to execute the machine-readable instructions of the memory configured to: determine a first value of power transferred to a stepper motor during a first operation of the stepper motor; determine a second value of power transferred to the stepper motor during a second operation of the stepper motor; determine a load angle of power delivered by the stepper motor during the first operation and second operation of the stepper motor based on the first value, the second value, and a stall power; and compare the load angle to a stall threshold to detect a stall of the stepper motor.

Abstract: A smart adjustable bed system combines an adjustable bed, a smart hub, a server, and smart devices to provide a system for controlling the raising and lowering of the adjustable bed. The smart hub acts as a gateway interconnecting the smart adjustable bed and a remote server capable of powerful voice recognition and artificial intelligence at a shared price. The system includes methods of using the system to allow an additional smart device such as a tablet computer to act as a remote control for the smart adjustable bed. The system further enables voice controls to be used to raise and lower the adjustable bed. Lastly, the voice recognition of the smart hub can be used to detect snoring and to send a signal to the adjustable bed to raise the bed to a position until the user reaches a position where snoring stops.

Abstract: Disclosed are implementations, including a method that includes obtaining measurement samples relating to electrical operation of an electric motor drive providing power to an electric motor, deriving, based on the samples, instantaneous estimates for parameters characterizing speed and/or position of the motor according to an optimization process based on a cost function defined for the samples, and applying a filtering operation to the instantaneous estimates to generate filtered values of the motor's speed and/or position. The filtering operation includes computing the filtered values using the derived instantaneous estimates in response to a determination that a computed convexity of the cost function is greater than or equal to a convexity threshold value, and/or applying a least-squares filtering operation to the derived instantaneous estimates and using at least one set of previous estimates derived according to the optimization process applied to previous measurement samples.

Abstract: A system is provided with a set of removable battery packs and a set of power tools each including a motor, a controller, and a battery receiving portion. For each power tool, the controller is configured to identify a type of battery pack coupled to the battery receiving portion and set a conduction band associated with phases of the motor or an advance angle by which phases of the motor are shifted based on the identified type of the battery pack.

Abstract: Disclosed in the present invention is a safety control method for a generator of a gas turbine power plant. The method includes the following steps: acquiring a safe power-receiving range value of a load, determining an output voltage of the generator, acquiring a ratio of rated power of the generator to a rotational speed of the generator, and acquiring a temperature difference between an internal temperature and an external temperature of the generator. In the present invention, stable voltage output of the generator is ensured by controlling the rotational speed, the number of turns of an output coil winding and a torque output value of the generator, such that stability and safety of operation is improved, an energy utilization rate is improved, and great significance for energy conservation, emission reduction, and energy loss reduction is achieved.

Abstract: An inverter. The inverter includes a first and second transistors, which are a high-side transistor and a low-side transistor of the inverter, and control electronics configured to trigger a first switching operation, in which the first transistor is switched on, wherein the second transistor is in a switched-off state, wherein a parasitic capacitance of the first transistor is discharged during the first switching operation, to trigger a second switching operation, in which the first transistor is switched off or switched on again, wherein the second transistor simultaneously remains in the switched-off state, wherein the parasitic capacitance of the first transistor is already discharged in the second switching operation, to record a time difference which describes a difference between a duration of the first switching operation and a duration of the second switching operation, and to determine a characteristic operating parameter of the first transistor based on the time difference.

Abstract: An electric motor drive device that includes an electric motor, a main circuit, a current sensor, and a control unit. The electric motor has a plurality of windings. The main circuit transforms power into AC power and supplies the AC power to each of the plurality of windings. The current sensor detects a load current flowing through each of the windings. The control unit controls the main circuit on the basis of a current value detected by the current sensor and controls an amount of power to be supplied from the main circuit to the electric motor on the basis of an amplitude of the load current associated with detection of an undervoltage state of the AC power supply in a state in which the main circuit uses conversion rule in which an index value for the amplitude of the load current flowing through the plurality of windings is defined.

Abstract: Systems, methods, and modes for controlling one or more roller shades in order to substantially synchronize and uniformly align a plurality of roller shades. Each shade comprises a roller tube, a shade material connected to the roller tube, a motor adapted to rotate the roller tube, and a controller. The controller is adapted to: drive the motor between a first limit position and a second limit position of the shade material at a first rotational speed; determine a run time it took the motor to move the shade material between the first limit position and the second limit position; using at least the determined run time, determine a second rotational speed for the controller to drive the motor between the first limit position and the second limit position within a predetermined run time; and set the motor to operate according to the second rotational speed.

Abstract: An HVAC system comprising: an appliance; a control assembly; a first motor; and a second motor. The control assembly: applies a electric signal to the first terminal of the first winding of the first motor for a number of intervals of time; afterwards, apply a second signal to the first terminal of the first winding; apply the first electric signal to the first terminal of the second winding for a second number of regular intervals of time; and after the application of the first electric signal to the first terminal of the second winding, apply the second electric signal to the first terminal of the second winding of the second motor; wherein the first number of regular intervals of time and the second number of regular intervals of time differ by one regular interval of time.

Abstract: A method of operating a motor includes providing an electric system coupled with the motor, the electric system including parallel inverter legs; subjecting the motor to a first interleaving angle when the electric system is under a first condition; and subjecting the motor to a second interleaving angle different from the first interleaving angle when the electric system is under a second condition; wherein the steps of subjecting the motor to the first interleaving angle and subjecting the motor to the second interleaving angle occur within continuous operation of the electric system and the motor.

Abstract: A method and system for online monitoring and compensation of inter-turn short circuit faults (ISF) in windings of electric machines, such as permanent magnet synchronous motors is provided. A method for characterizing an ISF in a winding of an electric machine comprises: measuring phase voltages and currents; calculating sequence components of the electric machine based on the phase voltages and currents; determining a ratio between a percentage of shorted turns in the winding and a fault loop resistance based on the sequence components of the electric machine; and estimating characteristics of the inter-turn short circuit fault using an unscented Kalman filter. The characteristics include at least one of: a fault current, the percentage of shorted turns, or the fault loop resistance. A method for compensation an ISF in a winding of an electric machine comprises compensating the fault current based on the compensation current estimated from an unscented Kalman filter.

Abstract: A motor controller includes an observer that estimates a ?-axis electromotive force and a ?-axis electromotive force, during an idle time of a rotor of a motor. The motor controller includes a derivation unit that derives a phase difference between dq axes and ?? axes, from the ?-axis electromotive force and the ?-axis electromotive force. The motor controller includes an estimation unit that estimates an idling state of the rotor from the phase difference. For example, the estimation unit estimates an idle velocity of the rotor from periodicity of the phase difference. For example, the estimation unit estimates a pole position of the rotor during the idle time, from the phase difference, a sign of the ?-axis electromotive force, and a sign of the ?-axis electromotive force.