YD Series
YD Series Pole-Changing Multi-Speed Three-Phase Induction Motor
Stepped speed change by switching the winding connection — two-speed and three-speed machines with no drive, no electronics and nothing to fail.
YD changes speed and power by changing how the winding is connected. It is a stepped-speed machine, not a stepless one: a single winding pole-changing design, built in two-speed and three-speed versions.
The appeal is what it does not have. There is no drive, no DC link, no harmonics on the supply and no drive cabinet to keep cool — which on a simple two-speed duty makes it simpler, smaller, quieter and considerably cheaper than a variable-frequency solution.
It is not for fans and pumps. Those follow a flow-versus-speed relationship that needs the power split designed around it, which is what the companion YDT series does. YD is for the general case: machinery that needs a high speed and a low speed and does not care about the curve in between.
Core specifications
| Parameter | Value |
|---|---|
| Frame size | H80 – H280 mm |
| Power range | 0.35 – 90 kW |
| Speeds | Two-speed and three-speed, single-winding pole changing |
| Voltage & frequency | 380 V, 50 Hz (custom on request) |
| Protection degree | IP44 / IP54 / IP55 |
| Cooling | IC411 |
Typical applications
- Machinery needing stepped speed change — machine tools, hoists, mixers, material handling
- Applications where a drive is unwanted for cost, harmonics or maintenance reasons
Selection guide
FAQ
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