43results about How to "Will not reverse" patented technology

The invention discloses a rotor positioning method and positioning device and a control system of a brushless direct current motor. The positioning method comprises the following steps: when conduction control is carried out on the stator winding of the motor according to a preset conduction mode, voltage detection pulses are sequentially applied to different phases of the stator winding of the motor, and a plurality of times are obtained by obtaining the time required for the current value of the stator winding at each phase to reach a preset current value; obtaining a preset time-sector relation table according to the preset conduction mode; and obtaining a sector where the rotor of the motor is located according to a plurality of times and the preset time-sector relation table and obtaining the rotor position of the motor according to the sector where the rotor of the motor is located. Therefore, the rotor position of the motor can be quickly and accurately obtained, the problems ofabnormal sound, shaking and positioning errors are avoided and the method is simple and can realize non-blind area positioning.

The invention discloses a connector base which includes a wiring board, a bottom board, and a plurality of inserts installed between the wiring board and the bottom board. Each insert includes an insert body, a first contact terminal, a second contact terminal and a wire pressing piece, wherein the first contact terminal protrudes upward from one end of the insert body, the second contact terminal protrudes upward from the middle of the insert body, and the wire pressing piece is arranged at the other end of the insert body. The first contact terminals are arranged at intervals in a row, and protrude from the wiring board. The second contact terminals are arranged at intervals in a row, and protrude from the wiring board. The wire pressing pieces are arranged at intervals and electrically connected with a plurality of wire pressing terminals. The wire pressing terminals are arranged at intervals in a row and installed on the wiring board. The first contact terminals and the second wiring terminals are used for being connected with a motor. The wire pressing terminals are connected with a fan coil load. The connector base is applicable to both a single-machine unit and a double-machine unit. The inserts are simple. The connector base has a compact overall structure.

The invention discloses a rotor positioning method, a rotor positioning device and a control system for a brushless direct current motor, wherein the positioning method comprises the following steps:when performing conduction control on the stator windings of the motor according to a preset conduction mode, applying a voltage detecting pulse of a first preset time to different phases of the stator windings of the motor in turn, and obtaining a plurality of current values by acquiring current values of the stator windings at each phase; acquiring a maximum current value among the plurality ofcurrent values, and marking the phase corresponding to the maximum current value as the first phase; acquiring the phase in which the current value is larger in the two phases adjacent to the first phase, and marking the same as the second phase; obtaining a sector in which the rotor of the motor is located according to according to the first phase and the second phase, and obtaining the positionof the rotor of the motor according to the sector in which the rotor is located. Therefore, the position of the rotor of the motor may be quickly and accurately obtained without the appearance of theproblem of abnormal noise as well as jitter and positioning errors. In addition, the method is simple, and the blind spotless positioning may be realized.

The invention discloses a rotor positioning method, a positioning device and a control system of a brushless direct current motor, wherein the positioning method includes the following steps: when conducting conduction control on the stator winding of the motor according to a preset conduction mode, the Apply a voltage detection pulse for the first preset time to different phases of the stator winding, and obtain multiple current values ​​by obtaining the current value of the stator winding in each phase; obtain the preset current-sector relationship according to the preset conduction mode table; obtain the sector where the rotor of the motor is located according to multiple current values ​​and a preset current-sector relationship table, and obtain the rotor position of the motor according to the sector where the rotor of the motor is located. As a result, the rotor position of the motor can be acquired quickly and accurately, and problems such as abnormal noise, vibration and positioning errors will not occur, and the method is simple and can realize positioning without blind spots.

The invention provides a lifter which integrates the manual operation and the automatic operation into a whole, and belongs to a small type lift. The invention includes a casing wall, which is directly used as a lift well and an insulative curtain wall; a table, which is used for man to stand on, is fixed on a ball nut, and is lifted up and down in the casing wall; a screw mandrel electric actuating mechanism, which includes a ball screw mandrel that is relatively quiescent, the ball nut which is matched with the ball screw mandrel, the bracket of a driving subassembly, a electric motor whichdrives a worm reduction box to rotate by a shaft joint, an upper supporting structure as well as a lower supporting structure of the screw mandrel, an adjusting screw nut, a driving gear and a drivengear; a manual control subassembly, which includes a handwheel / hand lever, a driving belt wheel, a driven belt wheel, a shaft block, the worm reduction box, a mounting deck of the handwheel, and a spline arranged between the driving belt wheel and the handwheel / hand lever. The invention has the advantages that the design is scientific and reasonable, and the structure is novel; the ball nut cannotreverse because a self-locking device is arranged on the lifter, the invention is light and flexible when being operated by hand, and the switching and the operation are easy. The invention is an ideal lifter which integrates two control methods of the the manual operation and the automatic operation into a whole.