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DRG Single-Phase Asynchronous Electric Motors
DRG single-phase (monophase) asynchronous electric motors run on a 220 V / 50 Hz single-phase supply across a 0.18 – 3.0 kW power range. Compact and economical, with a cast iron body and quiet operation, they are shipped from stock for residential, small industrial and commercial systems where a three-phase supply is not available.
General Technical Specifications
| Feature | Value / Description |
|---|---|
| Power range | 0.18 – 3.0 kW |
| Voltage | 220 V / 50 Hz |
| Speed | 750 / 1000 / 1500 / 3000 rpm |
| Frequency | 50 / 60 Hz |
| Efficiency | IE2 / IE3 equivalent high efficiency |
| Frame material | Cast iron or aluminium |
| Insulation | Class F (155 °C) |
| Protection | IP44 / IP55 |
| Mounting types | B3, B5, B14, B35 |
| Duty type | S1 (continuous) |
| Noise | 55 – 68 dB(A) |
| Vibration | ≤ 1.8 mm/s (ISO 10816) |
Construction and Components
- Stator: 100% pure electrolytic copper winding – high conductivity, low loss
- Rotor: squirrel-cage type – low inertia, fast response
- Body: cast iron (GG20)
- Fan: aerodynamic plastic – quiet airflow
- Bearings: SKF / C&U – quiet and long-lasting
- Capacitor: run and start types, two separate system options
Single vs Dual Capacitor Systems
Single-capacitor (CSIR – Permanent Capacitor): permanently running capacitor, low inrush current and low noise; medium starting torque. Ideal for fans, pumps and ventilation.
Dual-capacitor (CSCR – Start & Run): both start and run capacitors; high starting torque. Preferred for presses, compressors, small conveyors, agitators and mixers.
| Feature | Single-capacitor | Dual-capacitor |
|---|---|---|
| Starting torque | Medium | High |
| Noise | Low | Low |
| Efficiency | High | Very high |
| Application | Fan, Pump | Compressor, Press, Mixer |
Noise, Vibration and Cooling
Noise levels (dB(A)):
| Power range | Noise level | Test standard |
|---|---|---|
| 0.18 – 1.1 kW | 55 – 60 dB(A) | EN 60034-9 |
| 1.5 – 4.0 kW | 60 – 68 dB(A) | EN 60034-9 |
Vibration levels (RMS velocity – mm/s):
| Test standard | Value | Description |
|---|---|---|
| ISO 10816 | ≤ 1.8 mm/s | Normal operation |
| Special balanced version | ≤ 1.2 mm/s | Low-vibration applications |
Cooling and thermal protection: max. winding temperature 110 °C, temperature rise < 75 K, optional PTC / PT100 thermal protection.
Quality Tests (Post-Production)
- Winding resistance test
- Insulation resistance test (500 V Megger)
- Capacitor capacitance test
- Vibration analysis (ISO 10816)
- Noise test (EN 60034-9)
- Rotor balance test (G 2.5)
- Thermal camera temperature analysis
- Continuous run test (S1 – 2 hours)
Applications
- Water pumps and booster systems
- Industrial fans
- Air compressors
- Conveyor and feeding systems
- Agricultural machinery
- Agitators and mixers
- Small presses
- Workshop machines and bench motors
Why DRG Single-Phase?
- High starting torque – smooth start even under heavy load
- Quiet, low-vibration operation – 55–68 dB(A)
- Long-life bearings and winding
- High efficiency (IE2 / IE3 level)
- IP55 protection – full protection against dust and moisture
- From stock – 0.18 kW to 4.0 kW
Delivery, Warranty and After-Sales
Standard ratings ship from stock. All products carry a 2-year warranty, backed by nationwide service and technical support.
Request a Quote
Get a price for the power, speed, frame and capacitor option that fit your application:
Quick quote on WhatsApp | +90 542 666 11 11 | Contact & Quote Form
For details on asynchronous motor operating principles and efficiency, see our asynchronous / AC motors content.