Variable Speed Three Phase Motor

The full name of the variable-speed three-phase motor is the Y/Y2 Series Variable-Pole Multi-Speed Three-Phase Asynchronous Motor (commonly referred to as the multi-speed motor). The motor's core technology hinges on "single-winding variable-pole" design. By changing the number of poles in the stator windings, it achieves stepwise speed regulation. This cuts out the need for extra speed control devices, while still meeting the speed demands of different loads.
This motor series fully complies with international IEC standards. It covers a power range from 0.45kW to 82kW, with frame sizes spanning 80mm to 280mm. It works with 380V three-phase power supplies, and overseas voltage specifications are customizable. The motor features an IP44 protection rating and Class B insulation. It accommodates various mounting setups-horizontal types such as B3 and B5, along with vertical configurations like B14 and B35. It finds broad use in industrial settings needing stepwise speed adjustment: machine tools, mining, textiles, and fluid machinery. As a top-tier power solution, it strikes a balance between flexible speed regulation and high energy efficiency.

I.Key Point

Precise two-speed operation streamlines the mechanical structureIt enables fixed two-speed adjustment, with stepwise speed shifts achieved by switching winding connections. This eliminates the need for mechanical reduction components like gearboxes. For instance, when driving mining hoists: High-speed gear boosts efficiency during no-load ascents. Low-speed gear ensures safety during heavy-load descents. When powering textile machinery: Low-speed gear maintains fabric quality during weaving. High-speed settings boost output during fabric winding. They seamlessly adapt to the varying speed needs of different processes, while also reducing mechanical wear and effectively lowering long-term maintenance costs.
Take the 17/26kW two-speed motor (model YD200L1) – a common choice in European factories – as an example. Run 12 hours a day, 6 hours each at high and low speeds, with electricity priced at €0.2 per kWh, it saves about €700 annually. The calculation breaks down like this: 26kW×6h×365×10%×0.2 + 17kW×6h×365×10%×0.2≈€700. The cost savings stems from its better performance than traditional single-pole motors: efficiency improves by roughly 10%, power factor is markedly enhanced, and energy loss is reduced substantially. Meanwhile, operational noise drops by roughly 10dB (no-load noise ≤70dB), and vibration is controlled within 0.08mm. The reduction of AI rate creates a quieter workshop environment, which is ideal for noise-sensitive precision manufacturing.
This motor fits multiple mounting styles-no need to tweak the motor itself at all. Whether installed horizontally (B3), flanged (B5), or vertically (B14), it interfaces directly with equipment. Shaft dimensions and foot hole positions stick to international standards, so it swaps easily with similar products worldwide. When you replace old motors, there's no need to alter the equipment's connection structure. It works directly with flexible couplings, gears, pulleys, and other transmission methods-this cuts installation and commissioning time by over 50%.
Some of our motor models have got ISO and CE certifications-they can go straight into European and Asian markets without any extra tests! We can customize the voltage and frequency for you, like 480V for North America, 400V for Europe, and 60Hz frequency-all to match the power grid standards in different regions. On top of that, our key models come with ISO and CE certifications, so they meet entry requirements for Europe and Asia straight out of the box-no extra testing needed.

II. Core Safeguards

1. Certified Reliability
Full pre-shipment testing: insulation, speed, load, noise, vibration
Compliant with IEC, ISO, CE standards.
Complete test reports provided for traceability.
2. Secure Global Packaging
Custom packaging by motor power.
Reinforced boxes for low-power units.
ISPM15 wooden crates for high-power motors.
Ensures safe international delivery.
Low-power units (0.45–10 kW) are secured in heavy-duty cardboard boxes with additional cushioning, and critical parts like the shaft and junction box get extra protection. For high-power motors (10 kW and above), we use ISPM 15-certified plywood crates that stand up to international shipping. This approach eliminates shipping damage and simplifies cross-border logistics. We collaborate with international logistics partners to deliver door-to-door shipping services with transparent freight rates, enabling clear cost control. Orders of 20 units or more get volume discounts. All this ensures safe transport overseas.

3. Flexible Procurement and Customization Services
You can order as few as 1 unit-retail sales are available. We can customize non-standard parameters, including voltage, frequency, mounting methods, and junction box positions. We specialize in custom-engineered solutions for extreme environments. Does your operation face high temperatures (40°C+) or high altitudes (1000m+)? Our motors can totally handle that! We've got better cooling for hot environments and special insulation for high altitudes. We'll customize the setup to fit your specific environment needs perfectly

III. Product Advantages

Our variable-speed three-phase motor has high-strength enameled wire, which makes it better at keeping insulation good and moisture out. Tough conditions? No sweat! It works great from -15°C to 40°C, and stays stable even in dusty or damp spots-you can count on it wherever you install it.

IV. Usage and Maintenance Instructions

1.Operating environment:

2.Daily Maintenance Tips
Inspect the motor surface and heat sinks monthly-clean dust and oil residue promptly to prevent airflow blockage that hinders heat dissipation, ensuring stable motor operation.
Quarterly, verify the winding wiring configuration and terminal tightness to maintain smooth speed transitions. Meanwhile, check the bearing lubrication condition and replenish lithium-based grease as required to prolong component service life.
For long-term shutdowns (over 3 months), cut off the power first and store the motor in a dry, well-ventilated place. Each month, run a 30-minute test: switch between high and low speeds, 15 minutes for each. This effectively prevents moisture ingress into the windings and guards against bearing corrosion.

V. After-Sales Support

We stand behind our products fully with a one-year warranty. If there are any manufacturing defects, we'll either repair it or replace it, and you won't pay a thing. For our international customers, we also cover round-trip shipping costs for warranty services to major export regions. (Please note that standard wear and tear is not included.)
Technical Support: A dedicated technical hotline provides real-time guidance via video conferencing from professional engineers for issues including speed switching debugging, installation adaptation, and troubleshooting.
Spare Parts Supply: Common spare parts (bearings, seals, terminal blocks) can be selected at purchase. Ample inventory ensures rapid restoration of equipment operation in case of failure.
Variable-speed three-phase motors offer core advantages including precise speed regulation, high energy efficiency, flexible installation, and universal compliance. They perfectly address the demand for stepped speed control in industrial applications. Whether in machine tool processing, mining hoisting, textile production, or fluid conveyance, these motors deliver stable and reliable performance to meet diverse process speed requirements while reducing energy consumption and maintenance costs. They represent a cost-effective power solution for industrial enterprises undergoing upgrades and renovations.

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