Two-speed motors are drives with switchable rotational speed — one motor runs at two speeds. At Stojan you will find three-phase two-speed motors, both reconditioned and tested and new, in a range of power ratings and speed combinations. Dispatched within 24 hours from our warehouse in Poland.
How does a two-speed motor work?
The speed is changed by changing the number of pole pairs in the winding. Two solutions are used: a Dahlander winding (a single winding switched in a 2:1 pole ratio, e.g. 1450/2900 rpm) or two separate windings (any speed ratio, e.g. 750/1000 rpm). Switching is done by contactors in the control cabinet.
Where are two-speed motors used?
- Fans — two air flow rates (e.g. quiet / high-output mode) without an inverter.
- Pumps — switching the flow rate according to demand.
- Machine tools and machinery — high speed for operation and low speed for setting up.
- Escalators, agitators, feeders — two operating modes from a single drive.
Two-speed motor or frequency inverter?
A two-speed motor provides two fixed speeds at low cost and without electronics — a proven and robust solution. A frequency inverter gives stepless control across the whole range, but it is more expensive and requires configuration. If the application needs exactly two speeds, a two-speed motor is simpler and cheaper to run.
Need stepless speed control instead of two speeds? Combine a three-phase motor with an inverter from our accessories category. Looking for a low-speed, high-torque drive? See our gearmotors. Any questions? Call: +48 500 385 112.
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