3results about How to "Smooth torque" patented technology

The utility model provides a pneumatic nailing gun with an adjustable nailing force, it solves the technical problem that a nailing force adjusting precision of an existing pneumatic nailing gun cannot be kept for a long time. The pneumatic nailing gun comprises a shell and a firing pin, a first air cylinder and a second air cylinder are further arranged in the shell, and the first air chamber and the second air chamber are communicated with each other through a fully-closed ventilation channel, so that the first air chamber, the ventilation channel and the second air chamber form a pneumatic structure closed relative to the outside, and an air hole capable of keeping the pneumatic structure in communication with the outside is arranged in the pneumatic structure, and a handle capable of adjusting a ventilation capacity between the air hole and the outside is arranged on the shell.

The present application relates to the technical field of vehicles and discloses a motor torque zero-crossing control method and device, a vehicle, electronic equipment and a medium. The method controls the motor of the vehicle to output positive and negative periodic torques for multiple test periods when the wheels of the vehicle are in a braking stationary state, so that the gear performs different side-tooth movements, the mechanical angle of the motor rotor is monitored, the periodic transmission system gap is determined, the average transmission system gap is matched to obtain a target torque gradient correction value, the current torque zero-crossing gradient of the vehicle is determined based on the target torque gradient correction value and a preset basic zero-crossing torque gradient value, the torque of the motor of the vehicle is controlled to zero-cross, and the current torque zero-crossing gradient of the vehicle is corrected at different times in the life cycle of the vehicle. The adaptability of the current torque zero-crossing gradient to the vehicle is ensured, the zero-crossing abnormal sound problem of the vehicle is reduced, and the smoothness of the output torque of the power system of the vehicle is improved.

The invention relates to a permanent magnet synchronous motor fault-tolerant control method based on series winding topology. The invention relates to the field of motor control, and the method comprises the steps: selecting a zero-sequence current reference value according to a fault type; performing zero-sequence current injection according to the selected zero-sequence current reference value; and according to the injected zero-sequence current, performing quasi-proportional resonance control to realize fault-tolerant control of the permanent magnet synchronous motor. Compared with the prior art, the fault-tolerant control method of the series winding permanent magnet synchronous motor is simple and easy to implement, and fault-tolerant control of the series winding permanent magnet synchronous motor driver can be achieved only by updating the zero-sequence current reference value under the condition that a motor model, a modulation strategy and a control framework are not changed. And third harmonics in the zero-sequence current can be suppressed, and the performance of the motor is improved.