Abstract: A vaneaxial blower system having a stator and a rotor is disclosed. Each of the stator and rotor have a hub and blades, each of the blades have a leading edge and a trailing edge, an angle theta defined by a line extending from the respective leading edges to the respective trailing edges and the respective hub and an angle beta defined as an angle measured between a camber line between a first blade and a second blade and a horizontal tangential line that extends through respective leading edges of the first and second blade.

Abstract: The sampling phase detector whose output signal (fd) has a very broad-band and a very even frequency response characteristic includes a step-recovery-diode (SRD) to which a series circuit including at least two diodes (D1,D2) is connected in parallel by means of coupling capacitors (Ck1,Ck2). An input signal is fed to the diodes (D1,D2) by means of an R/C-network (R1,R2,C3,C4) and an output signal (fd) is taken off, which corresponds to the phase shift between an input signal (fo) and a reference signal (fr). The reference signal (fr) is fed to the step-recovery-diode (SRD) via a balancing transformer (Tr). Decoupling resistors (Rs1,Rs2) are included in the connecting lines from the balancing transformer (Tr) to the step-recovery-diode (SRD), which damp interfering resonances or reflections of the balancing transformer.

Abstract: To improve commutation and, particularly, to suppress commutator sparking and arc-over or flash-over, an auxiliary yoke is placed between the main poles and the auxiliary or commutating poles of a salient pole machine, the auxiliary yoke being formed of stacked lamellae, preferably with an adjustable air gap. Adjustability can be obtained by forming the auxiliary yoke with two interengaging sections, one of which is movable with respect to the other, so that commutation at the specific poles can be adjusted by adjusting the air gap of the auxiliary yoke.