YD Series

Pole-Changing Multi-Speed Induction Motor

Offers 2 or 3 discrete speeds with zero complex electronics. The ultimate durable, low-cost speed control solution.

For applications like machine tool cutting, mixers, or conveyors that require only fixed “High/Low” speed switching, the YD Series achieves physical speed variance by changing winding poles (typically via Dahlander connection).

Free from fragile capacitors or semiconductors found in VFDs, this motor consists of nothing but pure copper and silicon steel. It is virtually indestructible in harsh environments plagued by dust and heavy vibration, offering a “fit-and-forget” reliability that electronic drives cannot match.

Decode the JWmotor model number to quickly identify the specifications for a precise replacement.

Technical Specifications

JWMotor Product Range:

Power Range (KW)

0.45 – 82

Poles

2/4, 4/6, 4/8, 2/4/6, 4/6/8

Frame Size (IEC)

80 – 280

Rated Voltage

220V – 690V

Operating Conditions

+5°F To +104°F

Ambient Temperature

≤1000m

Altitude

±5% variation

Voltage Tolerance

* Class H insulation is available for high-temperature environments.
* Power derating is required for high-altitude regions.

JWMotor offers you motor solutions with the following
significant advantages

Mechanical Reliability

Speed variation is achieved solely by altering stator winding connections. The speed is locked to the grid frequency, providing absolute stability. This eliminates common VFD-related issues, such as torque loss at low speeds or complex parameter tuning errors.

EMC Friendly

The YD series generates absolutely no high-frequency harmonics. It will not interfere with precision instruments, sensors, or communication lines within your facility—making it the ideal choice for laboratory equipment or auxiliary drives in precision machine tools.

Cost-Effective

Eliminate the expensive ecosystem of “Motor + VFD + Shielded Cables + Filters.” The YD Series requires only simple contactors for dual-speed control, drastically slashing your initial equipment manufacturing costs (CAPEX) and simplifying circuit design.

Stiff Characteristic

Features a “hard” speed-torque curve, meaning the rotational speed remains virtually constant even as the load fluctuates. This is critical for machining equipment like drill presses and milling machines that demand consistent cutting speeds for precision finishing.

Industry Applications

FAQ

How does a YD series motor achieve different speeds?

The YD series uses a pole-changing design. By changing the internal winding connections (e.g., from 4 poles to 8 poles), the motor can switch between distinct speeds (e.g., 1500rpm to 750rpm) without needing an external frequency inverter.

Are YD motors more cost-effective than using a VFD?

For applications that only require 2 or 3 fixed speeds, YD motors are significantly more cost-effective. They eliminate the cost and complexity of a VFD while providing high reliability in harsh environments where electronics might fail.

What are the common applications for YD multi-speed motors?

They are widely used in the marine, mining, and machine tool industries, particularly for equipment like winches, drilling machines, and lathes where stepped speed control is preferred for simplicity.

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