72 Series Shaded Pole Motor
Overview
The 72 Series shaded pole motor is a compact, single-phase induction motor known for its simple construction, reliability, and cost-effectiveness. It utilizes a shaded pole (a short-circuited copper coil) to create a rotating magnetic field, enabling self-starting without capacitors or additional windings.
Key Features & Benefits
✔ Simple & Durable Design
No brushes, capacitors, or centrifugal switches → minimal maintenance.
Robust construction with a laminated stator core and shading rings.
✔ Low Starting Torque but Smooth Operation
Ideal for low-power applications requiring consistent, vibration-free performance.
✔ Quiet & Energy-Efficient
Low electromagnetic noise (<40 dB) → suitable for household appliances.
Operates at 50/60 Hz with moderate efficiency (typically 15-30%).
✔ Cost-Effective
Fewer components → lower manufacturing cost than capacitor-start motors.
Technical Specifications
| Parameter | Typical Range |
|---|---|
| Power Rating | 1W to 25W |
| Voltage | 100-240V AC (50/60 Hz) |
| Speed | 1500-3000 RPM (4/6-pole) |
| Torque | Low (sufficient for light loads) |
| Efficiency | 15-30% (lower than PSC motors) |
| Noise Level | <40 dB |
Common Applications
Household Appliances (Fans, humidifiers, coffee grinders)
HVAC Systems (Small blowers, exhaust fans)
Office Equipment (Projectors, document shredders)
Medical Devices (Air purifiers, small pumps)
Advantages & Limitations
✅ Pros:
Extremely reliable with long lifespan.
Simple and low-cost manufacturing.
No need for a starting capacitor or switch.
❌ Cons:
Low starting torque (not suitable for heavy loads).
Lower efficiency compared to capacitor-run motors.
Limited speed control options.
Comparison with Other Single-Phase Motors
| Feature | Shaded Pole Motor | PSC Motor | Capacitor-Start Motor |
|---|---|---|---|
| Starting Torque | Low | Medium | High |
| Efficiency | Low (15-30%) | Medium (50-65%) | Medium-High (60-75%) |
| Cost | Very Low | Moderate | Higher |
| Maintenance | Minimal | Low | Moderate (capacitor wear) |
The 72 Series shaded pole motor is a cost-effective, reliable solution for low-power, continuous-duty applications where simplicity and quiet operation matter more than high torque or efficiency.
Typical used:
Hospital nebulizer, Exhaust fan, air purifier, micro-oven, fan, induction cooker, refrigerator, pump, heater, hood oven, blwer, air conditioner, Heater machines, dehumidifiers
Thermal protector with one shot fuse or multi shot fuse
Shaft diameter(mm)=4-6mm
Shaft length(mm)=according to customer's requirement
Speed(r/min)=according to customer's requirement
Current(A)=according to customer's requirement
Input power(W)=according to customer's requirement
| MODEL | A OF SIZE | SHAFT DIA | VOLT | POWER | SPEED RATED |
| TL7218 | 18 | φ5/φ6 | 100-240 | 15 | 2000-2800RPM |
| TL7221 | 21 | φ5/φ6 | 100-240 | 17 | 2000-2800RPM |
| TL7225 | 25 | φ5/φ6 | 100-240 | 18 | 2000-2800RPM |
| TL7230 | 30 | φ5/φ6 | 100-240 | 22 | 2000-2800RPM |
| TL7240 | 40 | φ5/φ6 | 100-240 | 30 | 2000-2800RPM |
| Length | 75.5mm |
| Width | 72mm |
| Shaft Diameter | 6mm |
| Voltage | 230v 50Hz |
| Power Rated | 30W |
| Speed Rated | 3000rpm |
Parameter
| Max Torque | Max Efficiency | Max output power | |
| Torsion(M) | 71.690(mN.m) | 62.010(mN.m) | 68.930(mN.m) |
| Current | 0.499(A) | 0.456(A) | 0.479(A) |
| Speed(n) | 2306(rpm) | 2582(rpm) | 2455rpm) |
| Efficiency(Eff) | 30.98(%) | 33.41(%) | 33.00(%) |
| Output Power(P2) | 17.31(W) | 16.77(W) | 17.72(W) |
