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The motor that understands fluid dynamics. Tailored for quadratic load characteristics to eliminate the energy waste of "oversizing."
Fans and pumps obey the Affinity Laws of fluid dynamics: reducing speed by 50% drops power consumption to just 1/8th (12.5%). Standard constant-torque motors deliver excess power at low speeds, leading to unnecessary waste.
The YDT Series features a specialized Variable Torque winding design. Its torque output varies with the square of the speed, perfectly matching the load curve of impellers. This makes it the most cost-effective energy-saving speed control solution for HVAC systems and pump stations.
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
Quadratic Torque Matching
The output torque varies with the square of the speed, perfectly mirroring the load curve of fans and pumps. This specific design prevents the “over-excitation,” overheating, and energy waste often seen when standard constant-torque motors are forced to run at low speeds.
Structural Energy Savings
Leveraging the Affinity Laws, massive energy reductions are achieved simply by switching poles (e.g., switching to low speed during off-peak night hours)—all without expensive VFDs. It is the preferred solution for cooling towers and ventilation systems.
Optimized for High-Inertia Loads
The rotor design is specifically tuned for the high moment of inertia found in large fan impellers. This ensures smooth start-ups even under heavy loads, significantly minimizing mechanical shock and wear on belts, pulleys, and couplings.
Simplified Control & Maximum Reliability
Eliminate energy-wasting throttling valves and complex, failure-prone VFDs. Flow rates are regulated directly via simple contactor switching. The result is a robust, fail-safe system with virtually zero maintenance costs.
Industry Applications
FAQ
What is the main difference between YD and YDT series motors?
While both are multi-speed, the YDT series is optimized for variable torque loads. The power output changes quadratically with the speed, which matches the load characteristics of centrifugal fans and pumps, leading to higher efficiency.
How much energy can I save by switching to a YDT motor for my HVAC system?
By switching speeds based on demand (e.g., high speed for peak hours, low speed for off-peak), YDT motors can reduce energy consumption by up to 30-50% compared to single-speed motors controlled by mechanical throttling.
Can YDT motors withstand the high starting torque of large fans?
Yes, YDT motors are designed with high-quality copper windings and reinforced rotors to handle the high inertia associated with large industrial fans and water pumps, ensuring a smooth start-up every time.
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