One Sentence Summary
This Cheering servo motor model QLS4-550 is identical to the 550W Economy Servo Motor QLS3-550 in every performance aspect - the only difference is the price: over $1 lower per unit.
Side-by-Side Comparison
Side-by-side comparison - you'll see the difference immediately.
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| Model number | Economy Model QLS3-550 | Ultra-Economy Model QLS4-550 ( this product) |
| Price | Baseline | $1+ lower per unit |
| Motor Type | Brushless servo | Brushless servo |
| Power | 550W | 550W |
| Energy Saving | 87%+ | 87%+ |
| Efficiency Gain | 25% | 25% |
| Speed Range | 0-4200RPM | 0-4200RPM |
| Noise Level | Low-noise | Low-noise |
| Vibration | Smooth | Smooth |
| Forward/Reverse | One-touch | One-touch |
| Stator/Rotor | All-aluminum | All-aluminum |
| Base | Thickened plastic | Thickened plastic |
| Warranty | 1 year | 1 year |
| Compatibility | Lockstitch/Overlock/Edge-trimming etc. | Lockstitch/Overlock/Edge-trimming etc. |
Competitive Comparison
| Comparison | Traditional Clutch Motor | Ultra-Economy (This Product) |
| Motor Type | Brushed clutch | Brushless servo |
| Procurement Cost | Baseline | Lower than clutch, over $1 less than economy |
| Energy Saving | - | Over 87% |
| Efficiency | Baseline | 25% gain |
| Speed Adjustment | Baseline | 0-4200RPM Stepless |
| Noise Level | High noise | Low-noise |
| Vibration | Significant | Smooth |
| Forward/Reverse | Inconvenient / Not supported | One-touch |
| Maintenance | Frequent brush replacement | Maintenance-free |
Servo Motor 550w Key Advantages
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Over 1$ cheaper than Economy model, identical performance - Every yuan saved is pure profit.
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Brushless servo motor - maintenance-free - No brush replacement hassle or cost.
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Over 87% energy saving - Power on demand, near-zero standby consumption.
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25% efficiency gain - Fast servo response, higher output in the same working hours.
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0-4200RPM stepless speed adjustment - Starts from 0 - high speed for light fabrics, low speed for heavy materials.
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Smooth and low-noise operation - Significantly lower noise and vibration than clutch motors
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One-touch forward/reverse switching - Switch during operation - enhances back-tacking efficiency.
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Easy installation - direct replacement - No modification needed, directly replaces old clutch motors.
Brushless sewing machine motorInstallation Guide
Steps：Remove old → Mount new → Connect power → Adjust belt → Test run
Time：Quick replacement (anyone can operate)
Checkpoints：
| Check Item | Standard |
| Screws tightened | No looseness |
| Belt tension | Proper |
| Motor parallelism | Proper |
| Rotation direction | Proper |
| No-load abnormal noise | No friction or bearing noise |
Our Service Processes
Pre-sales Consultancy
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Confirmation of order
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Production
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Multi-Channel Shipping
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Confirmation of recei
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After-sale Services
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