4results about How to "No frustration" patented technology

This invention provides a braking method and braking device for a brushless DC motor. The brushless DC motor includes multiple bridge arms, each bridge arm having an upper bridge arm switch and a lower bridge arm switch connected in series. The bridge arms are connected to a stator coil of the brushless DC motor through a node between the upper and lower bridge arm switches. The method includes: receiving a braking signal for braking the brushless DC motor; generating a first control signal in response to the braking signal to control all upper bridge arm switches to open or control all lower bridge arm switches to open; and generating a second control signal in response to the braking signal to control all lower bridge arm switches or all upper bridge arm switches not controlled by the first control signal to be turned on in a predetermined manner to generate a gradually increasing current in all bridge arms and all stator coils to brake the brushless DC motor.

The utility model discloses a lifting water outlet nozzle mechanism and a water outlet device, the water outlet nozzle mechanism comprises a sleeve arranged on a body, the sleeve is internally provided with a water outlet nozzle capable of moving up and down, the water outlet nozzle comprises a water outlet pipe and a handle which are sleeved with each other, and the lifting water outlet nozzle mechanism further comprises an ejector rod capable of being driven, the water outlet pipe can axially move relative to the handle through the movement of the ejector rod; the sliding block can be far away from or close to the inner circumferential wall of the sleeve, an anti-sliding block is arranged at one end of the sliding block, the other end of the sliding block can be connected with the water outlet pipe in a matched mode so that the anti-sliding block can abut against the inner circumferential wall of the sleeve in a matched mode, and the water outlet pipe moves relative to the axis of the handle so that the anti-sliding block can be loosened from the inner circumferential wall of the sleeve. The water outlet nozzle can move up and down relative to the sleeve; the water outlet device comprises the lifting water outlet nozzle mechanism, and the water outlet nozzle mechanism can be suspended freely within the up-down stroke range of the water outlet nozzle mechanism.

The application discloses a gear NVH anchor point calibration and duty cycle switching cooperative optimization system and method, comprising: under selected torque, parameter value exhaustive combination is carried out on selected micro parameters of a gear transmission system, a plurality of micro parameter groups composed of micro parameters with different values are obtained, and a corresponding full-condition weighted peak-to-peak transmission error comprehensive evaluation value is obtained according to a peak-to-peak transmission error simulation curve and a peak-to-peak transmission error reference curve of the gear transmission system under each micro parameter combination, and the micro parameter group with the minimum full-condition weighted peak-to-peak transmission error comprehensive evaluation value is selected as the optimal anchor point reference parameter group for the gear transmission system to run; when the demand torque of the gear transmission system is in a preset optimization torque interval when the gear transmission system runs with the optimal anchor point reference parameter group, a two-point high-frequency duty cycle switching mode is executed.

The utility model discloses a lithium battery charge -discharge management system based on kinetic energy recovery, its characterized in that, including kinetic energy recovery power generation module, external quick charging module, lithium battery management module, external discharge module and user interactive module, kinetic energy recovery power generation module and external quick charging module are connected with lithium battery management module through charging switch and selection circuit, lithium battery management module is connected with external discharge module through discharge switch circuit, user interactive module inputs control signal to charging switch and selection circuit, discharge switch circuit and external discharge module, realizes man -machine interaction, kinetic energy recovery power generation module includes permanent magnet synchronous motor, rectifier circuit and kinetic energy recovery intensity intelligent regulation and control circuit, the utility model realizes the function that charges with the fluctuation high voltage power supply that permanent magnet synchronous motor kinetic energy recovery generates.