Multispeed Motors:
Dual speed or Multi speed motors against specific requirements are available. Amongst these, 2-speed motors are very popular and have been found to be an economically viable praposition in many applications. The changeover of speed can be done by a simple special switch or by suitable connections in the panel. A wide range of frame-wise standardized ratings as given in the table hereunder are available.
Frame Wise 2-Speed Motor Rating
| 1500/3000 RPM (4 / 2 POLE) | 750/1500 RPM (8 / 4 POLE) | |||||
| FRAME | KW | HP | FRAME | KW | HP | |
| 63 | 0.12./0.18 | 0.16/0.25 | ||||
| 71 | 0.30/0.45 | 0.4/0.6 | 71 | 0.07/0.12 | 0.1/0.16 | |
| 80 | 0.6/0.8 | 0.8/1.1 | 80 | 0.22/0.45 | 0.3/0.6 | |
| 90 L | 1.3/1.6 | 1.7/2.2 | 90 L | 0.45/0.9 | 0.6/1.2 | |
| 100 L | 2.2/3 | 3.0/4.0 | 100 L | 0.9/1.5 | 1.2/2.0 | |
| 112 M | 3.2/4 | 4.2/5.5 | 112 M | 1.3/2.2 | 1.8/3.0 | |
| 132 S | 4/5.5 | 5.5/7.5 | 132 S | 2.2/3.3 | 3/4.5 | |
| 132 M | 6.5/8.2 | 8.7/11 | 132 M | 3/4.5 | 4.0/6.0 | |
| 160 M | 9.0/11.0 | 12.0/15.0 | 160 M | 4.9/7.5 | 6.5/10 | |
| 160 L | 12.0/15.0 | 16.0/20.0 | 160 L | 6.8/10.5 | 9.0/14.0 | |
| 1000/1500 RPM (6 / 4 POLE) | 750/1000 RPM (8 / 6 POLE) | |||||
| FRAME | KW | HP | FRAME | KW | HP | |
| 71 | 0.12/0.15 | 0.16/0.2 | 71 | 0.06/0.09 | 0.08/0.12 | |
| 80 | 0.3/0.37 | 0.4/0.5 | 80 | 0.12/0.18 | 0.16/0.24 | |
| 90 L | 0.6/0.9 | 0.8/1.2 | 90 L | 0.3/0.45 | 0.4/0.6 | |
| 100 L | 0.9/1.3 | 1.2/1.8 | 100 L | 0.55/0.75 | 0.75/1 | |
| 112 M | 1.3/2 | 1.8/2.7 | 112 M | 0.75/1.2 | 1/1.6 | |
| 132 S | 2.2/3.3 | 3.0 /4.5 | 112 M | 1.3/2 | 1.8/2.7 | |
| 132 M | 3/4.5 | 4.0/6.0 | 112 M | 2/2.7 | 2.7/3.6 | |
| 160 M | 4.0/6.0 | 5.5/8.0 | 160 M | 3.0/4.0 | 4/5.5 | |
| 160 L | 6.0/9.0 | 8.0/12.0 | 160 L | 4/5.5 | 5.5/7.5 | |
| 500/3000 RPM (12 / 2 POLE) | 500/1000 RPM (12 / 6 POLE) | |||||
| FRAME | KW | HP | FRAME | KW | HP | |
| 100 L | 0.22/1.8 | 0.3/2.5 | 100 L | 0.25/0.55 | 0.33/0.75 | |
| 112 M | 0.4/2.5 | 0.55/3.3 | 112 M | 0.45/0.9 | 0.6/1.2 | |
| 132 M | 1.0/5.0 | 1.3/6.7 | 132 S | 0.9/1.8 | 1.2/2.4 | |
| 160 L | 2.0/11 | 2.7/15 | 132 M | 1.2/2.4 | 1.6/3.2 | |
| 160 M | 1.5/3 | 2.0/4.0 | ||||
| 160 L | 2.1/4 | 2.8/5.5 | ||||
| 750/3000 RPM (8 / 2 POLE) | 1000/3000 RPM (6 / 2 POLE) | |||||
| FRAME | KW | HP | FRAME | KW | HP | |
| 80 | 0.15/0.45 | 0.2/0.6 | 80 | 0.22/0.45 | 0.3/0.6 | |
| 90L | 0.3/1.1 | 0.4/1.5 | 90L | 0.5/1.1 | 0.67/2 | |
| 100L | 0.37/2.5 | 0.5/1.8 | 100L | 0.7/1.8 | 0.9/2.5 | |
| 112M | 0.7/2.5 | 0.9/3.3 | 132 M | 1.5/2.2 | 2.0/3.0 | |
| 132M | 1.5/5 | 2/6.7 | 132M | 2/0.55 | 2.7/7.5 | |
| 160L | 3.7/11 | 5.0/15.0 | 160 L | 5.0/11.0 | 6.7/15 | |
In this connection the following points may be noted :
- 4/2P, 8/4P & 12/6P motors are single winding D/YY, Dahlander connection motor.
- Other motors have separate Y (star) connected windings.
- The ratings indicated are maximum for particular frames.
- In separate winding motors, it may be possible to increase rating of one polarity, by reducing rating of other polarity
- The ratings shown above are for S1 duty. These may change for short time duty, more number of starts etc.
- The ratings are for TEFC construction, it may be possible to increase the ratings by force cooling.
