The invention discloses an infrared intelligent constant-temperature electric blower. The infrared intelligent constant-temperature electric blower comprises a blower body, an infrared temperature measuring device, an LCD device, a touch control button, an MCU processor and two silicon controlled rectifiers; the blower body is internally provided with a fan and a heating device; the infrared temperature measuring device is installed at an air outlet of the blower body; the LCD device is embedded on the outer side wall of the blower body; the touch control button is embedded on the outer side wall of the blower body; the MCU processor is internally arranged in the blower body, the input end is connected with the infrared temperature measuring device, and the output end is connected with LCD device; the two ends of one silicon controlled rectifier are connected to the MCU processor and the fan respectively.

In inverter control for supplying power to a motor, a power conversion device includes a temperature sensor for detecting a temperature of the inverter, a voltage sensor for detecting a voltage between terminals of a capacitor that smooths the voltage between terminals between the power source and the inverter, an inverter controller for controlling the inverter, a rotation speed sensor for detecting a rotation speed of the motor, an electric current sensor for detecting electric current supplied to the motor and a discharge determination instruction controller for giving an instruction for discharging electric charges accumulated in the capacitor, in which, control of reducing the rotation speed of the motor and discharge control of the capacitor are performed in accordance with the temperature of the inverter, the rotation speed of the motor and the electric current supplied to the motor.

In inverter control for supplying power to a motor, a power conversion device includes a temperature sensor for detecting a temperature of the inverter, a voltage sensor for detecting a voltage between terminals of a capacitor that smooths the voltage between terminals between the power source and the inverter, an inverter controller for controlling the inverter, a rotation speed sensor for detecting a rotation speed of the motor, an electric current sensor for detecting electric current supplied to the motor and a discharge determination instruction controller for giving an instruction for discharging electric charges accumulated in the capacitor, in which, control of reducing the rotation speed of the motor and discharge control of the capacitor are performed in accordance with the temperature of the inverter, the rotation speed of the motor and the electric current supplied to the motor.

The invention discloses an infrared intelligent constant-temperature electric blower. The infrared intelligent constant-temperature electric blower comprises a blower body, an infrared temperature measuring device, an LCD device, a touch control button, an MCU processor and two silicon controlled rectifiers; the blower body is internally provided with a fan and a heating device; the infrared temperature measuring device is installed at an air outlet of the blower body; the LCD device is embedded on the outer side wall of the blower body; the touch control button is embedded on the outer side wall of the blower body; the MCU processor is internally arranged in the blower body, the input end is connected with the infrared temperature measuring device, and the output end is connected with LCD device; the two ends of one silicon controlled rectifier are connected to the MCU processor and the fan respectively.

The invention discloses an infrared intelligent constant-temperature electric blower. The infrared intelligent constant-temperature electric blower comprises a blower body, an infrared temperature measuring device, an LCD device, a touch control button, an MCU processor and two silicon controlled rectifiers; the blower body is internally provided with a fan and a heating device; the infrared temperature measuring device is installed at an air outlet of the blower body; the LCD device is embedded on the outer side wall of the blower body; the touch control button is embedded on the outer side wall of the blower body; the MCU processor is internally arranged in the blower body, the input end is connected with the infrared temperature measuring device, and the output end is connected with LCD device; the two ends of one silicon controlled rectifier are connected to the MCU processor and the fan respectively.

A controller and methods for hybrid operation control of an electric motor in an electric motor system are provided. The controller is configured to receive a speed command for operating the electric motor, measure available voltage on an inverter configured to provide conditioned AC voltage to the electric motor, and determine a winding phase angle difference based on the received speed command and the measured available inverter voltage. The controller is also configured to adjust a phase angle difference between winding voltage commands for the switches of the inverter using the determined winding phase angle difference, and apply the winding voltage commands including the adjusted phase angle difference to the inverter switches to control the electric motor.

A controller and methods for hybrid operation control of an electric motor in an electric motor system are provided. The controller is configured to receive a speed command for operating the electric motor, measure available voltage on an inverter configured to provide conditioned AC voltage to the electric motor, and determine a winding phase angle difference based on the received speed command and the measured available inverter voltage. The controller is also configured to adjust a phase angle difference between winding voltage commands for the switches of the inverter using the determined winding phase angle difference, and apply the winding voltage commands including the adjusted phase angle difference to the inverter switches to control the electric motor.

A power tool is disclosed having a compact AC switch assembly. An electric motor driving the power tool is contained within a housing that includes a handle. A trigger is slidingly received in the handle and moves in an axis of trigger travel along a trigger travel distance extending between an extended position of the trigger and a depressed position. A trigger switch including a printed circuit board is disposed in mechanical communication with the trigger and controls the electric motor in accordance with trigger position. The printed circuit board has a plurality of conductive traces that are sequentially arranged and linearly aligned adjacent the trigger in a direction that is transverse to the axis of trigger travel to reduce the width of the printed circuit board to a value that is less than or equal to three times the trigger travel distance.

A power tool is disclosed having a compact AC switch assembly. An electric motor driving the power tool is contained within a housing that includes a handle. A trigger is slidingly received in the handle and moves in an axis of trigger travel along a trigger travel distance extending between an extended position of the trigger and a depressed position. A trigger switch including a printed circuit board is disposed in mechanical communication with the trigger and controls the electric motor in accordance with trigger position. The printed circuit board has a plurality of conductive traces that are sequentially arranged and linearly aligned adjacent the trigger in a direction that is transverse to the axis of trigger travel to reduce the width of the printed circuit board to a value that is less than or equal to three times the trigger travel distance.

An actuator (1) for driving a regulating element (30) for controlling a fluid flow in a flow channel (29) includes an electric motor (4) for driving the regulating element (30) and a control unit (2) for controlling a current provided to the electric motor (4). A resistive element (3) including a resistor (5) and a NTC thermistor (6) connected in parallel across the resistor (5) is positioned in a current path from the control unit (2) to the motor (4). Accordingly, when the ambient temperature increases, the decreasing resistance of the resistive element (3) counterbalances the increasing resistance of the motor windings, resulting in a less varying current from the control unit (2) to the motor (4) and therewith in a less varying output torque of the motor (4).