32results about How to "Precise modulation" patented technology

The invention discloses an electrical connector with an adjustable phase. The electrical connector comprises an interface main body, a tail main body and a jackscrew, wherein the interface main body comprises an inner conductor, an interface main body insulator and an interface main body housing which are fixedly connected from the inside to the outside; a non-split groove end of a matching bushing is pressed into the biggest stepped hole of the interface main body housing in an interference fit manner; the biggest stepped hole of a phase modulating screw barrel is connected with an outline step of the interface main body housing in an interference fit manner, i.e., the inner conductor, the interface main body insulator, the interface main body housing, the matching bushing and the phase modulating screw barrel are fixed relative to one another; the tail main body comprises a jack, a tail main body insulator and a tail main body housing which are fixedly connected in sequence from the inside to the outside; a bushing is pressed into the biggest step hole of the tail main body housing in an interference fit manner and the tail main body insulator is axially fixed, i.e., the jack, the tail main body insulator, the tail main body housing and the bushing are fixed relative to one another; and the phase modulating screw barrel is screwed in the bushing in a threaded connection manner and the interface main body is connected with the tail main body. The inner conductor and an outer conductor always keep continuous matching of impedance in the phase modulating process.

The invention discloses a multi-DC motor forward series control system and method, wherein 2*(n+1) IGBT modules are connected in series in pairs to form n+1 bridge arms; the n+1 bridge arms are connected in parallel with positive and negative poles of a DC power supply, and n DC motors which are serially connected in a forward manner are respectively connected in series with the n+1 bridge arms; the n DC motors are connected to a reference voltage synthesizer through two-stage PI controllers via a speed sensor, a current sensor and a speed adjustment module in sequence, and the reference voltage synthesizer is connected to n+1 phase inverters by a PWM pulse generating unit; the n+1 phase inverters are connected to the reference voltage synthesizer via current regulating modules and one-stage PI controllers, and are connected to the PWM pulse generating unit through the reference voltage synthesizer; and pulse control signals generated by the PWM pulse generating unit control the on / offof the 2*(n+1) IGBT modules to drive the n DC motors. The number of circuit elements is small, the structure is simple, the performance stability is reliable, and the wide use value is achieved.