3-Phase Industrial Motors
Squirrel-cage induction motors for pumps, fans, compressors and process machinery — foot, flange and combined mounting, in standard and energy-efficient (IE2/IE3) classes.
About 3-Phase Industrial Motors
The three-phase squirrel-cage induction motor is the standard prime mover in industry: a wound stator, a rotor of short-circuited bars, and no brushes or slip rings to maintain. It drives pumps, fans, compressors and most process machinery, either direct on line, through a star-delta or soft starter, or from a VFD.
Microtech supplies low-voltage (LT) induction motors from Crompton Greaves (CG Power), Havells, ABB and Siemens in IE2 high-efficiency and IE3 premium-efficiency classes, rated to IS 12615 and IEC 60034-30-1. Mountings include foot, flange and foot-cum-flange, with frame dimensions to IS 1231 and IS 2223 so a replacement motor matches the existing base or flange. Inverter-duty versions are available for VFD-fed applications.
We match the motor to the drive or starter it will run on — checking pole count, frame, insulation and cooling at reduced speed — so the motor and its control gear are specified together rather than bought separately and matched on site.
Key specifications
| Motor type | 3-phase squirrel-cage induction motor, TEFC |
|---|---|
| Efficiency classes | IE2 (high) and IE3 (premium); IE4 on selected ranges |
| Output range (example: Havells) | 0.18 kW to 350 kW, 220–690 V |
| Standard supply | 415 V ±10%, 50 Hz ±5% |
| Mounting | Foot (B3), flange (B5), foot-cum-flange (B35), face mounting |
| Frame sizes | IEC frames, dimensions to IS 1231 / IS 2223 |
| Degree of protection | IP55 standard; higher on request |
| Insulation | Class F (typical), S1 continuous duty |
Features & benefits
- IE2 and IE3 efficiency classes to IS 12615, with IE4 available on selected ranges
- Frame dimensions to Indian standards for drop-in replacement
- Foot, flange and foot-cum-flange mounting options
- IP55 enclosures for dusty and humid plant conditions
- Inverter-duty versions for VFD-fed pumps, fans and conveyors
- Motor and starter or drive specified and supplied together
Where it’s used
- Centrifugal and monoblock pumps
- Fans, blowers and cooling towers
- Air compressors
- Conveyors, mixers and crushers
- Machine tools and process machinery
Standards & compliance
3-Phase Industrial Motors — FAQs
Should I buy an IE2 or IE3 motor?
IE3 motors have lower losses than IE2 motors of the same rating, so they cost less to run. For motors that run long hours, the energy saving usually justifies the higher price. For motors that run only occasionally, IE2 can be enough.
Can any induction motor be run on a VFD?
Most modern motors can, but at low speed a self-cooled motor loses cooling, and long cables can stress the winding insulation. For heavy VFD duty we recommend an inverter-duty motor or a forced-cooling fan, and an output filter on long cable runs.
Will a new motor fit my existing base or flange?
If the frame size and mounting type match, yes — IS 1231 and IS 2223 fix the mounting dimensions for each frame. Send us the old motor's nameplate and we will confirm the matching frame.
Which motor brands do you supply?
Crompton Greaves (CG Power), Havells, ABB and Siemens. We can quote within a single brand if your plant has standardised on one.
