Axis Usa, Inc.

Atop S.p.a.

Federico Sbalchiero

Sabatino Luciani

Giuseppe Cardini

Massimo Lombardi

Rossano Galassi

Alessandro Rossi

Mauro Tarchi

Antonio Lumini

Romano Lozzi

Marco Carboncini

Gastone Dell'Aglio

A method and an apparatus for determining the electric resistances of coil connections (RSi) of connections (-) of coils (Bi) of a winding () of a dynamo electric machine, which includes a plurality of coils (Bi) connected in series. A first current (I) is generated through a first coil connection () of a first coil (B) of the winding (). Furthermore, a second current (I) is generated through a first coil connection () of a second coil (B, B) of the winding in such a way as to eliminate the current flowing through a portion (B-B) of the winding, which is proximate to the first coil connection () of the first coil (B) and the first coil connection () of the second coil (B, B). A third current (I) is also generated in a second coil connection () of the first coil (B). The generating of the first current (I), the generating of the second current (I), and the generating of the third current (I) are made with respect to a common potential (). Measurements are made of a first voltage (V) across a third coil (B), which is adjacent to the first coil (B), and of the current (I) flowing through the first coil connection () of the first coil (B). From these measurements a determination is made of the resistance (RS) of the first coil connection () of the first coil (B).

Method and apparatus for determining the Electric resistance of a coil connection of armature coils

A resin coating system includes a coating station for applying resin to dynamo-electric machine components such as electric motor armatures, one or more other stations adjacent to the coating station, a conveyor for transporting components through the coating station where the components are carried by holders holding at least one end of the components without touching the body portion of the components, another conveyor for transporting components through the other stations where the components are carried by holders supporting the body portion of the components, and a transfer device for transferring uncoated and coated components between the two conveyors. The holders attached to the conveyor in the coating station are capable of rotating the components about the longitudinal axis of each component during the coating operation for an even application of the resin to the component. The holders attached to the conveyor for transporting armatures through the other stations are of simpler and less expensive construction. Prior to resin application, the components may be heated by electrical resistance heating of their coils and by electromagnetic induction heating of their ferromagnetic cores.

Conveyance and processing of dynamo-electric machine components in resin

A tensioner for an armature winder which significantly reduces instantaneous increases in wire tension during winding or lead connection. System controls control the drag of a hysteresis brake, monitor wire tension via a load cell, and control a dancer arm's position through limit sensors and a closed-loop proportional valve (which regulates the pressure within an air cylinder coupled to the dancer arm). These system controls significantly reduce instantaneous increases in wire tension during winding, during the start of winding, and during lead connection. A wire breakage detection device also monitors the wire during winding and signals the system controls if wire breakage is detected. Upon such detection, a rapid discharge valve discharges the air cylinder, and flyer arm rotation is halted prior to the wire becoming unthreaded from the flyer arm.

Wire tensioner for dynamo-electric machine coil winder

The balance of rotors for dynamo-electric machines (e.g., electric motor armatures), which are wound with two diametrically opposite, simultaneously applied coils of wire, is improved by ensuring that wire is fed to both coils in substantially similar quantities. This can be accomplished by monitoring the lengths of the two wires as they are fed to the armature using wire sensors located adjacent to the flyer. Alternatively, wire sensors can be provided to monitor the rate at which wire is being fed towards respective flyers and to measure the rate of change of the lengths of those portions of the wires that are supported by the winding machine dancer arms. A control system processes the measurements from these sensors. A wire tensioner having a hysteresis clutch is also provided that allows the tension applied to a wire being wound to be adjusted rapidly. The wire tensioner also picks up slack that may develop in the wire.

Methods and apparatus for tensioning wire in a winding machine

Armatures for dynamo-electric machines are balanced during manufacture by measuring the unbalance of the armature assembly prior to winding the coils on the armature. The numbers of turns of wire in at least some of the coils subsequently wound on the armature are then adjusted so that the unbalance of the resulting coils compensates for the unbalance of the armature prior to coil winding. Alternatively, one or more extra turns of wire that are short-circuited at the commutator may be added to help balance the armature. In addition, masses may be added to the armature to ensure that it is balanced dynamically as well as statically.

Methods and apparatus for producing dynamo-electric machine armatures

Methods and apparatus for balancing armatures during coil winding

An improved fusing machine is provided that allows commutators to be balanced during the fusing process. Commutator tangs are compressed onto coil leads to form lead connections. The fusing machine compresses the tangs to varying degrees relative to the shaft. The commutator can be balanced during fusing by compressing tangs to a common radial position or by compressing diametrically opposed tangs to the same extent.

Methods and apparatus for commutator fusing

In the performance of fusing operations which involve the application of force and heat to a workpiece, the heat being generated at least in part by electrical resistance heating resulting from passage of an electrical current through an electrical circuit which includes the workpiece and typically also a fusing electrode, the fusing cycle is controlled at least in part on the basis of measurements of the resistance of the above-mentioned circuit during the fusing operation. If desired, the resistance measurements may be corrected to eliminate or at least substantially reduce the contribution of electrode resistance so that the fusing operation is controlled on the basis of the resistance of the workpiece.

Fusing methods and apparatus for use in making dynamo-electric machines

The coils on dynamo-electric machine parts (such as electric motor armatures or stators) are stabilized and coated by electrostatically coating them with resin powder, and then fusing the powder into a continuous resin coating on the coils. For example, the powder may be fused by heat generated by briefly passing a relatively large electrical current through the coils. If desired, the coils may be formed with wire which has an outer layer of bonding material. Activation of the bonding material, which may occur simultaneously with fusing of the resin powder, bonds adjacent coil wires together.

Bonding and coating methods and apparatus for th coils of

Commutators of armatures for electric motors or other dynamo-electric machines are finished by subjecting them to inspection and turning operations. The first inspection operation determines the minimum amount of material that can be cut while producing a high quality armature. This determination may indicate that no formal turning is required, only finishing. The turning operation, if applicable, cuts the commutator to a substantially cylindrical shape which is substantially concentric with the axis of rotation of the armature. The finishing operation, which may be performed by the same mechanism as the turning operation, imparts a desired axial roughness to the cylindrical commutator surface. The commutators may be inspected after the turning and finishing operations to generate data useful for such purposes as automatically modifying the turning and finishing operations performed on subsequent commutators.

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Florence, Italy

Federico Sbalchiero