35results about How to "Reduce torque shock" patented technology

The invention provides a method, device and system for controlling engineering machinery gear shifting, wherein the method, device and system provided by the invention are used for solving the problem that the speed change box is subjected to greater impact caused by the clutch combination control method of mechanical land leveler in the prior art. The method comprises the following steps: determining the rotation speed difference between a speed change box input shaft and an engine when a clutch of engineering machinery is subjected to zero zone combination; and comparing the rotation speed difference with a preset value, and increasing the current of a clutch electromagnetic valve coil when the rotation speed difference is greater than the preset value, thus the clutch is combined further. By adopting the technical scheme provided by the invention, shock-less gear shifting can be realized, and the components of the speed change box are protected effectively; the torque impact of the clutch is released, and the service life is prolonged; and the working intensity of a driver is relieved, and the operation comfort is improved.

The invention relates to an axial-field permanent magnet compensated impulse generator with double contra-rotating rotors and belongs to the technical field of an impulse generator. The axial-field permanent magnet compensated impulse generator comprises a left rotor, a stator disc, a right rotor, two end caps and a shell. The left rotor, the stator disc and the right rotor are sequentially arranged in a hollow-square-shaped space formed by the two end caps and the shell along an axial direction. The left rotor along with one of the end caps and the right rotor along with the other end cap are in mirror symmetry on two sides of the stator disc. An air gap is formed between the left rotor and the stator disc, and another air gap is formed between the stator disc and the right rotor. The left rotor comprises a left rotor disc yoke, a left rotor permanent magnet, a left rotor compensation disc, a left rotor bandage, a left rotor shaft and a left rotor support. The stator disc comprises a stator support and a stator disc yoke. The double contra-rotating rotor compensated impulse generator is capable of solving the problem that the sizes of two motors are enlarged due to the fact that the two motors are arranged side by side and enabled to rotate reversely to counteract electromagnetic torque impact generated by the existing impulse generator during discharging.

The invention discloses a hollow radial-magnetic-field permanent magnet opposite-rotating double-rotor compensation pulse electric generator, and belongs to the technical field of pulse electric generators. The hollow radial-magnetic-field permanent magnet opposite-rotating double-rotor compensation pulse electric generator aims at solving the problems that two electric generators are arranged in parallel at present and synchronously and oppositely rotate to counteract electromagnetic torque impacting generated during discharging of the pulse electric generators, and the sizes of the electric generators are enlarged accordingly. The hollow radial-magnetic-field permanent magnet opposite-rotating double-rotor compensation pulse electric generator comprises an outer rotor, an inner rotor and a stator. An inner rotor shaft and an outer rotor shaft are coaxial, the outer rotor, the stator and the inner rotor are sequentially and coaxially arranged from outside to inside, an outer air gap is formed between the outer rotor and the stator, and an inner air gap is formed between the stator and the inner rotor. An inner rotor yoke is fixed to the inner rotor shaft, an inner rotor permanent magnet is arranged on the outer circumference surface of the inner rotor yoke, and an inner rotor compensation cylinder and an inner rotor bandage are sequentially arranged on the outer circumference surface of the inner rotor permanent magnet; the magnetic field formed by the inner rotor permanent magnet and the magnetic field formed by the outer rotor permanent magnet are intersected with one side of a stator armature winding. The hollow radial-magnetic-field permanent magnet opposite-rotating double-rotor compensation pulse electric generator is a compensation pulse electric generator.

The invention belongs to the technical field of air conditioners. According to the invention, the problems of low efficiency and high energy consumption of a condensed-water discharging pump of the original ceiling type air conditioner are solved. The key points of the technical scheme are as follows: due to special design of a direct-current brushless motor of an outer rotor and a shaft-output structure of a rotor shell and a plastic sealing process, a newly-designed motor not only can be connected with the size of an original shaded-pole water pump on structure size, is consistent in assembly and can be directly replaced, but also can meet certain protection-grade requirement, so that a product can work normally and still under the muggy and wet working environments.

An internal drive-external power generation integrated pulse generator power supply relates to the technical field of inertial energy storage pulse power supply. The invention aims at solving the problem that the prior pulse generator and the prime mover are connected through the coupling, the coupling is easy to be subjected to torque impact, the axial length of the system is increased, and the compactness of the structure is poor. A generator is arranged inside the casing, a motor is arranged inside the generator, an electromagnetic field is separated between the generator and the motor through a magnetic isolation ring, and the armature winding of the motor is connected with a three-phase alternating current to drive the rotor core of the motor to rotate, thereby driving the magnetic isolation ring and the rotor yoke of the generator to rotate to generate electric power. The iInternal drive-external power generation integrated pulse generator power supply is used to increase the energy density and power density of the system.

The invention discloses a two-workpiece-platform rotary exchange method and a device based on cable-box anti-rotation mechanisms, belonging to the technology of semiconductor manufacturing equipment. The device comprises two workpiece platforms, a rotary switching platform and two cable-box anti-rotation devices, wherein in the rotary exchange process of the two workpiece platforms, the rotary switching platform clamps the two workpiece platforms and rotates around the center of a base platform so as to realize exchange of an exposure station and a preprocessing station; and the cable-box anti-rotation mechanisms control self rotation of the two workpiece platforms so as to guarantee the same phase of the two workpiece platforms in the platform exchange process. The device in the invention can be used for solving the problems of large impact torque and more platform exchange steps in the existing linear platform exchange scheme and phase reverse of the two workpiece platforms, cable winding and target missing of a laser interferometer and the like in the existing rotary platform exchange scheme, and adopts a smaller weight balancing system so as to be beneficial to shortening the balance time; and simultaneously the system is simplified, the cost is reduced, the platform exchange steps are reduced, the platform exchange time is shortened, and the yield of photoetching machinesis effectively improved.

The invention discloses an active short-circuit method for preventing torque impact. The method comprises the following steps: using a direct-current high-voltage detection circuit to detect a direct-current bus voltage, using a speed detection circuit to detect a rotating speed of a motor, and if the bus voltage reaches a voltage threshold value or the received rotating speed of the motor reachesa speed threshold value, entering an active short-circuit mode; providing a PWM waveform with a very small duty ratio for three transistors of a high-voltage side bridge arm in a three-phase bridge type inverter circuit, and turning off the three transistors of a low-voltage side bridge arm; gradually increasing the duty ratio of the PWM waveform of the three transistors of the high-voltage sidebridge arm; when the duty ratio of the PWM waveform of the three transistors of the high-voltage side bridge arm reaches a preset value, making the three transistors of the high-voltage side bridge arm be all switched on; and if the rotating speed of the motor is lower than a rated rotating speed, making the three transistors of the high-voltage side bridge arm be all turned off, sealing waves andstopping. A variable duty ratio method is adopted, the torque impact is reduced, driving comfort performance is improved, and a vehicle power system and personal safety are protected.

The embodiment of the invention provides a motor protection device and method. The device comprises a controller, a driver, a three-phase bridge rectifier circuit, a bus capacitor, three switching circuits and three first resistors; the controller is used for sending a control signal to the driver and controlling the on-off state of each branch in the three-phase bridge rectifier circuit and/or the switching circuits; the driver is used for applying voltage to the grid electrode of a first IGBT and/or the grid electrode of a second IGBT through the received control signal, providing driving current and controlling the on-off state of the first IGBT and/or the second IGBT; the three-phase bridge rectifier circuit is used for quickly discharging the bus capacitor and supporting the operation of an active short circuit; and the switching circuits are used for switching to a preset branch according to the received control signal of the controller so as to protect a motor. In the prior art, torque cannot be effectively reduced in time, as a result, a vehicle power system cannot be protected, and the driving experience is affected. Withthe motor protection device adopted, the above defects can beovercome.

The invention belongs to the field of motor control, and particularly discloses an initial speed identification and belt speed restarting control method and device of an asynchronous motor. Comprising the following steps: taking half of the maximum rotor frequency of a motor as an initial value of first speed search, and applying a voltage vector according to the value of the rotor frequency; constructing a stator voltage frequency calculation model applied by speed search; drawing a curve graph of the change of the stator current along with the rotating speed under the stator voltage rotating at the fixed frequency and a stator current expansion Heyland circle under the stator voltage rotating at the fixed frequency, and constructing a criterion function according to the curve graph; judging the iteration direction of the stator voltage frequency calculation model according to the criterion function; and taking the new rotor frequency obtained by iteration as the stator voltage frequency to be applied in the nth search to perform search calculation and repeated iterative calculation until the search calculation meets a set end condition, outputting the rotor frequency of the motor, and assigning the rotor frequency to the speed observer. According to the invention, belt speed restarting control can be successfully realized under very small current and torque impact.