355kW LV Asynchronous Low Noise Gear Motor

Brief Introduction

Engineered for harmonic-rich VFD operation, the YR-355L-4 low noise gear motor minimizes inverter-induced losses through electromagnetic optimization. Its reduced stator/rotor resistance counters PWM-generated copper losses, while increased inductance dampens high-order harmonics (≈2× carrier frequency).

This low noise gear motor integrates F-class (155°C) insulation with enhanced turn-to-turn dielectric strength to withstand repetitive dv/dt stress from steep-edged PWM voltages. Critical thermal management employs an independently driven cooling fan, maintaining temperature rise within 10% above sinusoidal supply levels despite harmonic iron losses. Structural refinements include:
- Vibration-damped rotor bars suppressing acoustic resonance
- Isolated bearing chambers preventing shaft current circulation
- Precision-balanced rotors (G2.5) reducing magnetic noise

The design specifically mitigates skin-effect losses near synchronous speed, where harmonic voltage cutting exacerbates rotor heating. By optimizing impedance matching across the torque-speed curve, this low noise gear motor sustains >90% efficiency under non-sinusoidal power-critical for variable-speed gear drives requiring silent operation below 65 dB(A). Compatibility extends to all PWM topology inverters, with reinforced ground insulation blocking surge propagation. Proactive noise control and thermal stability define its operational advantage in sensitive automation environments.

Main Technical Parameters

Production Details

Frame

• Compact and robust iron casting frame

• Universal IEC and NEMA installation dimensions available

• Customizable outlook and dimensions

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Stator

• 99.9% pure copper winding for stator to ensure the output power and efficiency

• Excellent insulation system with 5 more processing flows

• All the windings are fitted in by handwork to ensure all slots are full and avoid any winding flaw.

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Rotor

• Aluminum casting rotor with high quality silicon steel rotor core to assure induction efficiency

• Well and precisely machined shafts with good capacity of strength and toughness

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Testing

• All motors must pass the piece testing before painting and packaging

• Type tests will be regularly performed for each series, more often for new developed series and variants.

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Applications

Cement

Power station

Steel

Sugar

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