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Special Purpose Motors

Pole-changing multi-speed, dual-power, high-starting-torque and electromagnetic brake machines for duty the standard series does not cover.

Pole-changing multi-speed three-phase induction motor

YD Series

Two and three speed, stepped

0.35–90 kWTwo / three speedSingle winding
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YDT pole-changing multi-speed motor for fan and pump duty

YDT Series

Multi-speed, fan and pump duty

0.17–160 kWTwo / three speedFan & pump law
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YDGJ dual-power three-phase induction motor

YDGJ Series

One speed, two power ratings

18.5–75 kWTwo power ratingsOilfield
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DYG high-starting-torque multi-speed motor

DYG Series

High starting torque, two speeds

8–60 kWTwo speedsWith control box
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YEJ electromagnetic brake three-phase induction motor

YEJ Series

Fail-safe electromagnetic brake

0.55–90 kWBrakes on power lossS3 duty
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Technical articles on these series

Motor Duty Types S1 to S10: What Each One Commits You To

If the purchaser does not state a duty, the manufacturer is required to assume S1. That default is wrong for every cyclic load, and it is silent.

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YD vs YDT Multi-Speed Motors: Match the Load Curve First

Why general pole-changing YD motors and fan or pump-oriented YDT motors must be selected from the driven-load torque curve, not speed alone.

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Brake Motors: How the Brake Releases, and What Fails

The brake is the part that works when the power does not. Everything follows from that inversion — including a wiring choice most people get wrong.

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Brake Motors for Wind-Turbine Yaw Drives: A Selection Checklist

A practical checklist for selecting and replacing yaw-drive brake motors, covering brake logic, duty, gearing, environment, feedback and fail-safe behaviour.

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Comparing across families, or filtering by power, voltage and protection?See the full range with filters. If the duty falls outside what these series publish, tell us the application — custom builds cover ratings the standard series do not.