An electrical motor or generator comprises a rotor 79 without windings, a stator 78 having armature windings comprising at least two coils A.sub.1, A.sub.2 having active portions positioned within armature winding slots 81 in a stator iron, and field windings F having active portions positioned within field winding slots 80 in the stator iron. An electronic control circuit is provided for controlling the currents in the coils A.sub.1, A.sub.2 in synchronism with rotation of the rotor such that p...

Fastener delivery apparatus for automatically selecting and delivering fasteners such as rivets to a setting tool (1). The fasteners are pre-loaded in a package (4) and dispense via at least one fastener delivery tube (6) that interconnects the setting tool (1) to a fastener feeder device. The fastener feeder device releases selected fasteners from the package (4) into the delivery tube (6). The fasteners are transportable individually or in groups in the tube (6) from the feeder device to the t...

An electrical machine comprises a rotor without windings, a stator having an armature winding (24,25) and a field winding (10) for generating a magnetomotive force in a direction extending transversely of the magnetomotive force generated by the armature winding. An electric circuit (40) is provided for controlling the current in the armature winding (24, 25) such that periods in which a magnetomotive force in one direction is associated with a first current pulse alternate with periods in which...

Fastener delivery apparatus for automatically selecting and delivering fasteners such as rivets to a setting tool. The fasteners are pre-loaded in a package and dispense via at least one fastener delivery tube that interconnects the setting tool to a fastener feeder device. The fastener feeder device releases selected fasteners from the package into the delivery tube. The fasteners are transportable individually or in groups in the tube from the feeder device to the tool. A transfer station atta...

A reciprocating machine such as a vacuum pump includes a cylinder in which a reciprocating piston is disposed for reciprocating movement. A variable voltage driver is provided for driving the piston and a vibration sensor is provided for sensing contact between the piston and ends of the cylinder. A controller interconnects the sensor and driver to control movement of the driver and piston to maximize piston stroke and reduce if not eliminate contacting of the piston with the cylinder.

An apparatus and method for forming batches in predetermined count or length of laminar articles standing on edge for transfer from multiple supply lines/chutes to a common delivery line is disclosed. The common delivery line is located operatively below the supply lines/chutes. The axis of movement of the common delivery line is perpendicular to the axes of movement of the supply lines/chutes. The apparatus includes a horizontal platform on which the laminar articles, such as biscuits are led f...

An electrical machine comprises a rotor without windings, a stator having an armature winding 24, 25 and a field winding 10 for generating a magnetomotive force in a direction extending transversely of the magnetomotive force generated by the armature winding. An electronic circuit 40 is provided for controlling the current in the armature winding 24, 25 such that periods in which a magnetomotive force in one direction is associated with a first current pulse alternate with periods in which a ma...

A fastening machine (1) has guide block (11) with a rivet delivery passage (12). Rivets (17) are supplied from a source via tube (22) and are delivered to the rivet delivery passage (12) by a rivet supply passage (20). The head of the rivet (17) is engaged by spring-loaded balls (60) to hold the rivet (17) in alignment with the rivet delivery passage (12) and a punch (16). When a limit switch (30) detects the presence of a rivet (17) in the rivet delivery passage (12), the punch (16) is advanced...

State machines having a hierarchical arrangement of machines as between a parent state machine 10 and sibling state machines 11, 12, and 14. The parent state machine 10 generates a plurality of outputs constituting its output state as based upon its input state defined by inputs N and its internal state. Part of the input state is defined by a set of inputs 15 which include asynchronous signals such as reset and interrupts. The parent state machine 10 defines or partially defines input states as...

A turbo machine comprising: an impeller having a plurality of blades therewith; a casing having a flow surface defined therein and being positioned with the impeller therein; and a plurality of grooves being formed in the flow surface of the casing, for connecting between an inlet side of said impeller and an area on the flow surface of the casing in which the blades of said impeller reside. Each groove has a length of at least part of which is oriented in an axial direction of the casing, a wid...