Pole-Changing Two-Speed Three-Phase Motor

Pole-Changing Two-Speed Three-Phase Motor in China

Our Pole-Changing Two-Speed Motors (such as YD Series) are the ideal solution for applications requiring discrete speed adjustments without the complexity of an external frequency inverter.

Explosion Proof YD Dual Speed Fan Motor
The Explosion Proof YD Dual Speed Fan Motor is a dual-speed ventilation motor designed for explosion-proof environments.
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High-Torque YD 15kW Conveyor Dual-Speed Motor
The High-Torque YD 15kW Conveyor Dual-Speed Motor is a dual-speed, variable-pole, three-phase asynchronous motor that achieves two speeds by changing the number of poles.
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Fast Braking Response Motor
The Fast Braking Response Motor is a high-performance motor with high-speed braking capability, capable of instantaneous braking in the event of a power outage or emergency.
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Speed-Adjustable Brake Motor
Speed-Adjustable Brake Motor is a high-performance motor that combines adjustable speed with an electromagnetic braking system, suitable for various industrial applications such as packaging...
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Brake Motor with Manual Release
Brake Motor with Manual Release is a safety drive device combining an electric motor and electromagnetic brake, designed with a manual release function for easy operation during power-off or...
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Key Performance Specifications

Feature	Technical Standards / Options
Speed Combinations	4/2 Pole, 8/4 Pole (Constant Torque); 6/4 Pole (Constant Power)
Frame Sizes	80mm to 315mm (H)
Output Power	0.35 kW to 160 kW
Protection Class	IP54 / IP55 (Standard); IP65 (Optional)
Insulation Class	Class F (Standard) with Class B temperature rise
Cooling Method	IC411 (Self-fan cooling)
Mounting Types	B3 (Foot), B5 (Flange), B35 (Foot & Flange)

Common Applications

Our two-speed motors are the preferred choice for industrial sectors where precise, stepped speed control is mandatory:

Lifting & Cranes: Low speed for positioning; high speed for transport.

Ventilation Systems: High speed for peak hours; low speed for energy saving.

Machine Tools: Different gear ratios for drilling, milling, and tapping.

Pumps & Compressors: Flow rate adjustment without VFD overhead.

Selection Guide

Selecting the correct YD series motor depends primarily on your machine’s torque requirements at different speeds. Please use the following three criteria to finalize your specifications:

Selecting the correct YD series motor depends primarily on your machine’s torque requirements at different speeds.

Pole & Speed Correlation (at 50Hz)
Determine your required "High Speed" and "Low Speed" settings.

4/2 Pole (1440 / 2880 RPM): The most common choice for high-speed industrial fans and standard machinery.

8/4 Pole (720 / 1440 RPM): Ideal for heavy lifting and industrial mixers requiring high starting torque.

6/4 Pole (960 / 1440 RPM): Used specifically for precision machine tools (Constant Power).

Identify Your Load Characteristics
The connection method determines how the power and torque change when you switch speeds.

Load Type	Speed Change Logic	Connection Type	Typical Applications
Constant Torque	Torque remains the same; Power doubles with speed.	Y / YY	Conveyors, Hoists, Cranes, Elevators.
Variable Torque	Torque increases with speed (Squared).	Y / YY	Centrifugal Fans, Blowers, Cooling Pumps.
Constant Power	Power remains the same; Torque drops as speed increases.	Delta / YY	Lathes, Milling Machines, Grinders.

FAQ

Q: Can these motors be customized for specific voltages?

A: Yes. While 380V/50Hz is standard, we provide customization for 220V, 400V, 440V, or 460V and 60Hz to meet international electrical standards (CE, UL, or CSA compliance available).

Q: What is the lead time for bulk orders?

A: Standard frame sizes (80–160) are typically available in 15-20 days. Custom windings or specialized shaft extensions usually require 30-45 days.

Q: Are the dimensions interchangeable with standard single-speed motors?

A: Most of our YD series motors follow IEC 60034 standards, meaning the mounting holes and shaft dimensions are identical to standard YE2/YE3 motors of the same frame size.

Q: Do you provide wiring diagrams for the two-speed switchgear?

A: Yes. Every shipment includes a detailed Connection Diagram (YY/Δ or Y/YY) inside the terminal box to ensure your engineering team can easily integrate the motor with your control panels.

We're well-known as one of the most professional pole-changing two-speed three-phase motor enterprises in China, featured by quality products and good service. Please rest assured to buy discount pole-changing two-speed three-phase motor in stock here from our factory. For quotation, contact us now.