Concentrated Winding
Contact Us Now
Concentrated winding is a motor winding structure in which each coil is wound around an individual stator tooth or pole. Compared with distributed winding, concentrated winding can shorten end-turn length, improve copper utilization, simplify coil insertion and support compact motor designs with high slot fill and efficient thermal paths.
This winding method is widely used in BLDC motors, PMSM motors, servo motors, outrunner motors, axial flux motors, linear motors, pump motors and compact high-torque applications. It is especially useful when the design requires short axial length, low copper loss, automated winding, flexible pole-slot combinations and repeatable phase connection.
Ningbo Vanguard Technologies supplies custom concentrated winding solutions for motor stators and wound stator assemblies. We support lamination stack preparation, bobbin or tooth insulation, coil winding, phase connection, lead wire processing, impregnation, varnish, potting, temperature sensor integration and electrical inspection.
Whether you need prototype wound stators for motor development or batch-ready concentrated winding assemblies for production, Vanguard can review slot geometry, wire diameter, turns, phase layout, insulation class, resistance target and test requirements to provide a practical winding plan.
Concentrated winding structures can be customized according to stator slot geometry, pole-slot combination, winding method, insulation system and production volume.
| Winding Type | Structure | Main Advantage | Typical Application | Engineering Notes |
|---|---|---|---|---|
| Single-Tooth Concentrated Winding | Each coil wound around one stator tooth | Short end turn and compact layout | BLDC, PMSM, servo motors | Requires careful phase layout and slot insulation design. |
| Segmented Stator Winding | Individual teeth wound before stator assembly | High slot fill and easy coil access | High torque density motors | Tooth assembly accuracy and welding/joining process are important. |
| Needle Winding | Automatic winding directly into slots | Good repeatability for batch production | Small and medium motor stators | Slot opening, wire path and machine access should be reviewed. |
| Bobbin Winding | Coil wound on insulated bobbin or tooth carrier | Stable insulation and simple assembly | Compact motors, pumps, fans | Bobbin thickness affects slot fill and thermal path. |
| Parallel-Strand Winding | Multiple wires wound in parallel | Lower resistance and better current capacity | Low-voltage high-current motors | Strand balance and termination method must be controlled. |
| Hairpin / Formed Coil Support | Preformed conductor or shaped coil solution | Consistent geometry and high current capacity | Special traction or high-power designs | Tooling, insulation and welding process should be evaluated early. |
The final winding design is confirmed according to motor performance target, stator geometry, voltage, current, insulation class, thermal condition and production requirement.
| Item | Available Options | Engineering Notes |
|---|---|---|
| Stator Structure | Inner stator, outer stator, segmented stator, axial flux stator, custom core | Slot shape, tooth width, yoke thickness and lamination stack height affect winding method. |
| Wire Type | Round enameled copper wire, parallel strands, litz wire, rectangular wire support | Wire type is selected by current density, frequency, space and termination requirement. |
| Turns & Connection | Custom turns, star connection, delta connection, parallel branches, series coils | Resistance, back EMF, speed constant and torque target should be reviewed together. |
| Insulation System | Slot liner, bobbin, phase paper, sleeve, tape, varnish, potting | Insulation class and creepage clearance should match operating voltage and temperature. |
| Lead Wire | PTFE, silicone, PVC, XLPE, terminal, connector, customized length | Lead exit direction, strain relief and connector type should be defined before production. |
| Thermal Treatment | Varnish impregnation, vacuum impregnation, resin potting, thermal adhesive | Thermal path, vibration resistance and moisture protection can be improved by impregnation. |
| Inspection | Resistance, hipot, insulation resistance, surge test, phase sequence, appearance | Test items are selected according to motor rating and customer acceptance standard. |
| Factor | Risk If Ignored | Recommended Control |
|---|---|---|
| Wire Tension | Loose coils, damaged enamel, inconsistent slot fill or resistance variation | Define winding tension range and verify coil shape during trial production. |
| Slot Insulation | Short circuit, low insulation resistance or hipot failure | Use proper slot liner, bobbin, sleeve and phase insulation for voltage and temperature class. |
| End-Turn Height | Interference with housing, rotor or assembly components | Control coil forming fixture and define maximum end-turn envelope on drawings. |
| Lead Routing | Wire fatigue, wrong phase sequence or difficult assembly | Confirm outlet position, connector, strain relief and phase marking before production. |
| Impregnation | Vibration noise, moisture risk or poor heat transfer | Select varnish, vacuum impregnation or potting according to motor environment. |
| Electrical Testing | Hidden winding defects and unstable motor performance | Perform resistance, hipot, insulation resistance, surge or phase sequence tests as required. |
