Abstract: A shaft rotation driving apparatus for a machine tool having a main spindle for rotating a tool or a workpiece, comprises: a magnetic anisotropic rotor formed integral with the main spindle itself or with a rotary sleeve itself fitted to the main spindle; a stator disposed coaxially along an outer circumference of the magnetic anisotropic rotor; a field winding wound around the stator, for magnetizing the rotor in a predetermined direction; and an armature winding wound around the stator, for providing a rotative force to the rotor.

Abstract: A shaft rotation driving apparatus for a machine tool having a main spindle for rotating a tool or a workpiece, comprises: a magnetic anisotropic rotor formed integral with the main spindle itself or with a rotary sleeve itself fitted to the main spindle; a stator disposed coaxially along an outer circumference of the magnetic anisotropic rotor; a field winding wound around the stator, for magnetizing the rotor in a predetermined direction; and an armature winding wound around the stator, for providing a rotative force to the rotor.

Abstract: A shaft rotation driving apparatus for a machine tool having a main spindle for rotating a tool or a workpiece, comprises: a magnetic anisotropic rotor formed integral with the main spindle itself or with a rotary sleeve itself fitted to the main spindle; a stator disposed coaxially along an outer circumference of the magnetic anisotropic rotor; a field winding wound around the stator, for magnetizing the rotor in a predetermined direction; and an armature winding wound around the stator, for providing a rotative force to the rotor.

Abstract: An apparatus for producing high-speed rotation has a rotary shaft integrally having a first rotor with magnetic anisotropy, and a rotary sleeve disposed around the rotary shaft. The rotary sleeve has a first stator surrounding to the first rotor and integrally has a second rotor having magnetic anisotropy. The first stator has a field winding for magnetizing the first rotor in a predetermined direction. This winding is also an armature winding because it undergoes high-speed rotation with the second rotor. The rotary sleeve is received in a housing which has a second stator surrounding the second rotor. The second stator has a field winding for magnetizing the second rotor in a predetermined direction and for producing high-speed rotation of the second rotor. By analogy, the housing can become a further rotary sleeve, constructed similarly to the above-mentioned rotary sleeve.

Abstract: A digital mode phase modulation type position detector utilizing a resolver as the phase modulating element is disclosed in which the phase of the modulated signal is determined by comparing it with that of the follower signal, the phase of which is adjusted to that of the modulated signal. The phase difference between the modulated and the follower signal is detected at the ends of the half-periods thereof to effect the adjustment. To make the adjustment more precise, an adjustment circuit may further be provided which generates evenly spaced pulses in the present half-period of the follower signal at a frequency corresponding to the rotational speed of the resolver during the preceding half-period of the modulated signal. These pulses are used to adjust the phase of the follower signal more closely to that of the modulated signal.

Abstract: A programmable sequence controller and a sequence control system including a plurality of such controllers. Each sequence controller includes a program memory for storing a preprogrammed sequence of instructions for controlling a machine or part of a machine in response to the status of the machine or part being controlled. Each controller includes data transfer circuitry for receiving status data from another sequence controller on a common data bus and transmitting its own status data to all of the other sequence controllers on the common data bus. Each sequence controller includes an input-output (I/O) memory and an (I/O) flag memory for storing and keeping track of current status information from each of the plurality of controllers.