Abstract: This specification describes improvements to cutting blades and a cutting blade assembly. In some forms the cutting blade includes an upturn with an upturn radial angle which is non-parallel to a reference axis.

Abstract: A demodulator for the demodulation of polyphase voltages of n phases, interfering among themselves which constitute a system of polyphase pseudo-sinusoidal voltages modulated in amplitude to a pulsation .epsilon., in order to obtain a system of polyphase voltages of pulsation .epsilon.. The demodulator is preferably formed by n heteropolar synchronous rotating polyphase machines and includes n stators of n phases, fed by n systems of polyphase pseudo-sinusoidal voltages modulated in amplitude to a pulsation .epsilon., and of the form ##EQU1## in which i represents the index of the group of voltages and varies from 1 to n, and p represents the index of phase of the group of voltages and varies from 1 to n. Mounted for rotation with the n stators are n wound rotors, each including magnetic circuits made up of a low loss material and capable of passing an alternating magnetic flux without damping, each rotor having the same number of poles as the corresponding stator.

Abstract: A demodulator for the demodulation of polyphase, in particular triphase, voltages interfering among themselves and constituting a system of polyphase pseudo-sinusoidal voltages modulated in amplitude to a pulsation .epsilon., to obtain a system of polyphase voltages with a pulsation .epsilon.. The demodulator comprises a polyphase rotating machine including three 3-phase armatures connected through a common yoke made up of a low magnetic loss material, and fed by three systems of polyphase pseudo-sinusoidal voltages modulated in amplitude to a pulsation .epsilon.. A rotor freely rotates within the armature and includes three magnetic circuits connected through a common magnetic axle with the flux carrying parts of the rotor being a low loss magnetic material. Three static coils are disposed concentric with the axis of the magnetic rotor axle, and three systems of polyphase voltages of pulsation .epsilon. are collected at the respective terminals of the coils.

Abstract: A pulsating signal generator for the production, in particular, of 3 systems of triphase voltages, in which the resulting pseudo-sinusoidal voltages of the 3 systems are modulated in amplitude at predetermined, fixed or variable pulsation .epsilon., and staggered in phase by 2.pi./3 radians among themselves. The generators of the double homopolar rotating machine type comprise a magnetic stator circuit of double homopolar alternator construction provided with two armatures, each including a system of triphase windings with 3 independent circuits per phase, each circuit of each phase of the first armature being connected in series with one of the circuits of a phase of the second armature. A rotor with a rotating magnet divided into two half-rotors by an airgap 23 is disposed on a shaft concentric with the armatures and an excitation induction coil, concentric to the axis of the rotor provides magnetic flux through the armatures. A driving means drives the half-rotors at speeds .mu..sub.1, and .mu..sub.