Abstract: The present application relates to the technical field of motor control, and provides a motor control method and system. The motor control method includes: each driving chip receives state information fed back by a sensor corresponding to the driving chip; when the driving chip receives the state information, a processor receives the state information; the driving chip processes the state information to obtain a first control signal, and the processor processes the state information to obtain a second control signal; and at least two of a plurality of driving chips drive, according to the first control signals and the second control signals corresponding to the driving chips, motors corresponding to the driving chips for linkage.

Abstract: The multi-frequency antenna transmission, including a drive gear, a gear train with parallel gear shafts, screw assemblies and a shifter. The transmission gears are connected to the stoppers of the screw assemblies one by one, the drive gear drives the various transmission gears to rotate, and all the stoppers rotate. The shifter pushes the stopper of one of the screw assemblies, such that the first elastic member disposed between the connection member and the stopper is compressed, and the connection member is connected to corresponding lead screw, thus the power of the stopper is transmitted to corresponding lead screw through the compressed first elastic member and the connection member, and drives the lead screw to rotate.

Abstract: A multiband antenna transmission, including: a driving gear, a shifter, and a plurality of screw assemblies. The position and the driving gear are coaxially and rotatably arranged, and the shifter comprises a plate and a boss protruding from a side of the plate. The plurality of screw assemblies are arranged in a circumferential direction of the driving gear. Each of the plurality of screw assemblies includes: a lead screw, a driven gear selectively connected with or separated from the lead screw, and a first elastic member arranged between the lead screw and the driven gear. The boss is configured to sequentially push the driven gear of the respective screw assembly during rotation of the shifter, such that the driven gear is connected with the corresponding lead screw and whereby the driven gear is in mesh with the driving gear for transmission.

Abstract: A mobile phone camera extension-and-retraction device (100) and a mobile phone, wherein, the mobile phone camera extension-and-retraction device (100) comprises a driving unit (1), a reversing gear mechanism (2), a connecting drive mechanism (3), a control module and a shell (4), the driving unit (1) is controlled to rotate forwardly or reversely by the control module, thereby driving the first planetary pinion (22) or the second planetary pinion (23) of the reversing gear mechanism (2) to mesh with the second drive gear (31) of the connecting drive mechanism (3), and driving the rack member (32) for straightly reciprocating movement, such that the mobile phone camera fixedly connected to the rack member (32) extends or retracts automatically.

Abstract: A mobile phone camera extension-and-retraction device (100) and a mobile phone, wherein, the mobile phone camera extension-and-retraction device (100) comprises a driving unit (1), a reversing gear mechanism (2), a connecting drive mechanism (3), a control module and a shell (4), the driving unit (1) is controlled to rotate forwardly or reversely by the control module, thereby driving the first planetary pinion (22) or the second planetary pinion (23) of the reversing gear mechanism (2) to mesh with the second drive gear (31) of the connecting drive mechanism (3), and driving the rack member (32) for straightly reciprocating movement, such that the mobile phone camera fixedly connected to the rack member (32) extends or retracts automatically.

Abstract: A camera extending and retracting device, including: a support base configured to be mounted inside a housing of a mobile phone; a screw movably arranged on the support base; a drive unit in connection with one end of the screw; a nut arranged on the screw; a push block mounted on the nut and configured to connect with the camera module of the mobile phone. The other end of the screw is provided with a load bearing mechanism configured to bear an axial force of the screw, and the load bearing mechanism is mounted on the support base. A mobile phone, includes: a housing, a camera module arranged in the housing, and a display screen arranged on the housing, and the above camera extending and retracting device.

Abstract: A transmission device and a rack corner steering mechanism, the rack corner steering mechanism comprises an input gear (10) and a rack steering assembly (20), the rack steering assembly (20) comprises a plunger (21) and a plurality of rack units (22), the plunger (21) is a straight bar and is moved along a straight trajectory, and the plunger (21) adjacent to the rack unit (22) is obliquely connected to an end of the plunger (21), each of the other rack units (22) is successively connected to the end of the front rack unit (22), when each rack unit (22) is engaged with the input gear (10), the rack unit (22) is rotated and is in line with the plunger (21). The rack unit (22) can be rotated to ensure the flexible steering of the steering mechanism, the reciprocating motion of the input gear (10) is converted into the reciprocating motion of the plunger (21), which has the advantages of smooth operation, good continuity, low noise, high bearing capacity, reliable, compact structure, and small volume.