31results about How to "Avoid loss of precision" patented technology

The invention relates to a high-accuracy rotational speed controller of a phase-locked motor. The high-accuracy rotational speed controller comprises a first counter, a second counter, a third counter, a proportion integration differentiation (PID) controller, a pulse width modulation (PWM) controller and a Hall sensor, wherein the counters are used for counting a period of an external output reference square wave signal SYN, a period of a Hall signal and current phase difference between the square wave signal SYN and the Hall signal according to a frequency CLK, the Hall period counting valuen' is subtracted from the SYN period counting value n to obtain a difference value es used as rotational speed part control quantity, reference phase difference 0 is added to the current phase difference phaseErr, phase part control quantity ep is obtained after graining k, the sum of the es and the ep is used as total control quantity e to be input to the PID controller, an output is finally obtained by the PID controller, and the motor is controlled to rotate by the PWM controller. On the basis of traditional rotational speed feedback, a phase-locked loop is additionally arranged, relatively high rotational speed accuracy of the motor is ensured, the phase of a reference signal also can be traced constantly, and the problem that an angle error rotated by the motor can become large withtime accumulation due to rotational speed deviation of a pure-rotational speed control ring is solved.

The invention discloses a pipe fitting forming device, which comprises a workbench and an upper base plate arranged sequentially from top to bottom, a lifting mechanism is arranged between the workbench and the upper base plate, and the upper base plate moves up and down through the lifting mechanism; the top surface of the workbench The lower mold assembly, the lower stripping plate and the lower mold base are arranged in sequence from top to bottom; the upper mold base, the upper stripping plate and the upper mold group are arranged in sequence from top to bottom on the bottom surface of the upper base plate opposite to the top surface of the workbench pieces. Compared with the single-station, single-process processing mode, the present invention saves the time spent on re-clamping pipe fittings between processing processes, has high processing efficiency, avoids the loss of precision caused by multiple clamping, and effectively improves the processing accuracy. , fully meet the quality requirements.