YDT Series
YDT Series Pole-Changing Multi-Speed Motor for Fans and Pumps
A pole-changing multi-speed motor whose power split at each speed is designed around the fan and pump flow law — which is where the energy saving actually comes from.
YDT changes speed by switching the winding connection, in two-speed and three-speed single-winding versions. What separates it from the general-purpose YD series is how the power is apportioned between the speeds: it follows the proportional relationship between flow and speed in fans and pumps.
That matters because fan and pump power falls roughly with the cube of speed. A machine sized so that its low-speed rating matches what the fan actually needs at low speed is a much better fit than one carrying full-speed capability it will never use down there.
It suits continuously running fans and pumps whose duty varies periodically — the seasonal and temperature-driven airflow changes common in mining, metallurgy, textiles, chemical plant, light industry and building services.
Core specifications
| Parameter | Value |
|---|---|
| Frame size | H80 – H315 mm |
| Power range | 0.17 – 160 kW |
| Speeds | Two-speed and three-speed, single-winding pole changing |
| Power distribution | Apportioned to the fan and pump flow-versus-speed relationship |
| Voltage & frequency | 380 V, 50 Hz (custom on request) |
| Protection degree | IP44 / IP54 / IP55 |
| Cooling | IC411 |
Typical applications
- Continuously running fans and pumps with periodically varying flow
- Mining, metallurgy, textiles, chemical and light industry ventilation
- Building services where airflow is adjusted by season or temperature
Selection guide
FAQ
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