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Glass Banded

Typical glass banded commutators differ from V-ring type commutators. V-ring commutators have steel V-rings insulated with mica that hold the copper & mica assembly together while under pressure. Since the pressure is only applied at both ends of the segment pack, vibration and lifting can occur if the copper bars required are to be quite long. In a glass banded construction, resin-glass banding is applied under tension to cut grooves along the surface of the copper bars. The number of bands and their placement can vary depending on bar length, brush placement, and overall armature design.
Glass band commutators are often lighter in overall weight than their V-ring style counterparts. The steel core on a V-ring type commutator is often thicker because of the space needed for steel V-rings and anchoring nut/bolts. On a glass banded commutator, the core is usually just an insulated barrel. .
Glass Banded to V-ring Conversions
Glass banded commutators are advantageous in certain use cases. However, in some applications, they carry more disadvantages than advantages. Glass banded commutators are difficult to repair, cannot be re-insulted, and can be susceptible to failure in high heat and contamination environments due to the banding. Some countermeasures can be applied to the banding in the final stages of construction, but often these are not enough. In these situations, a glass banded to V-ring conversion may be considered.
Converting a glass banded commutator to a V-ring type commutator is not always a viable or possible solution. Many factors must be considered before attempting this type of re-construction for an aftermarket application. Weight, copper segment length, armature airflow or venting, and cost are all factors that must be examined by our qualified engineers.
EMCC can manufacture multi glass banded commutators, hybrid v-ring & glass banded commutators, various riser types including inserted, solid and lap-joint, and glass banded conversions to V-ring style (where applicable).
24/7 Emergency Repairs
When failures occur, EMCC has the capacity and ability to work around the clock to manufacture or service the commutators and coils you need. 24/7 production capability allows EMCC to deliver unmatched quality, with the best turnaround times in the industry. Often, coils within 24-hours and commutators between 24-48 hours.