COMPONENTS

ARMATURE COILS

A brushed DC motor has a set of rotating windings wound on an armature mounted on a rotating shaft. The shaft also carries the commutator a long-lasting rotary electrical switch that periodically reverses the flow of current in the rotor windings as the rotor bar rotates. Thus, every brushed DC motor has AC flowing through its rotating windings. Current flows through one or more pairs of brushes that bear on the commutator; the brushes connect an external source of electric power to the rotating armature.

The rotating armature consists of one or more coils of wire wound around a ferromagnetic core. Current from the brushes flows through the commutator and one winding of the armature, making it a temporary magnet. The magnets field produced by the armature interacts with a stationary magnetic field produced by either permanent magnets or another winding armature coil, as part of the motor frame. The force between the two magnetic fields tends to rotate the motor shaft. The commutator switches power to the armature coils as the rotor turns, keeping the magnetic poles of the rotor from ever fully aligning with the magnetic poles of the stator field, so that the rotor never stops (like a compass needle does), but rather keeps rotating as long as power is applied.

NISIDA-WIM Engineering produces and replaces worn armature coils and V-rings.

For wave and lap armatures
Single conductor and multiple conductor coils
“On Edge” coil forming
Consistent accurate coil shape
Single turn and multi turn coils
Special insulation systems, customer specified, hybrid/combination

MICA V-RINGS

Mica V-rings or cones is made of hot moulding mica sheets of B or H class, it is pressed by mould under heat. Mica V-rings or cones is uniform in thickness, no delamination, it is used as commutators insulation of railway traction motors, HV explosion – proof motors and DC motors.

BRUSH GEARS, BRUSH ARMS AND BRUSH BOXES

A commutator consists of a set of copper segments, fixed around the part of the circumference of the rotating machine, or the rotor, and a set of spring-loaded brushes fixed to the stationary frame of the machine.

The brushes are in constant contact with the commutator. As the brush and commutator wear down, a spring steadily pushes the brush downwards towards the commutator. Eventually the brush wears small and thin enough that steady contact is no longer possible, or it is no longer securely held in the brush holder, and so the brush must be replaced.

When a commutated motor or generator uses more power than a single brush can conduct, an assembly of several brush boxes is mounted in parallel across the surface of the exceptionally large commutator.

This brush box and brush gears distributes current evenly across all the brushes.

WIM Engineering produces many commutator components, including brush boxes, brush arms and brush gears.

At WIM engineering we are pleased to announce that we manufacture 80% of all the components in house therefore saving turn-around time and assuring the best pricing.

COMMUTATOR

A Commutator is a rotary electrical switch in DC electric motors or electrical generators that periodically reverses the current direction between the rotor and the external circuit. In a motor, it applies power to the best location on the rotor, and in a generator, picks off power similarly.

As a switch, it has exceptionally long life, considering the number of circuits makes and breaks that occur in normal operation. Even though commutators are perceived as old technology there are still a large amount of dc motors in use today, especially in the Mining industry. WIM Engineering manufactures and repairs all types and makes of commutators and slip rings. Commutators are made up of hundreds of individual parts that must remain stable in relation to each other at varying speeds and at differing temperatures and humidity. During production, commutators are heated and pressed to a point where they will remain stable under any conditions.

WIM Engineering takes great care in producing and maintaining Commutators that are trustworthy and durable.

From 40mm D/A upwards
Lock nut or bolted construct
Class F & H insulation
Commutators Fully electrically tested and spin seasoned before despatch
Air Flow bore
Quick turnaround time

ROTOR BARS

Thus, every brushed DC motor has AC flowing through its rotating windings. Current flows through one or more pairs of brushes that bear on the commutator; the brushes connect an external source of electric power to the rotating armature.

SLIP RINGS

The slip ring is an electric transmission device that allows energy flow between two electrical rotating parts, such as in a motor. The slip ring is designed to carry current or signals from a stationary wire into a rotating device. It consists of a metal brush which rubs on the outside diameter of a rotating metal ring.

As the metal ring turns, the electrical current or signal is conducted through the stationary brush to the metal ring making the connection.

WIM Engineering produces high quality slip rings for use in DC Motors.

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