SINOTEST offers a comprehensive range of high-precision balancing machines engineered to measure and correct unbalance in rotating components with exceptional accuracy, stability, and repeatability.
From ultra-light micro-rotors weighing less than 1 gram to heavy industrial rotors up to 7,500 kg, our dynamic rotor balancing systems are designed to meet the full spectrum of production and laboratory requirements. Each system integrates advanced vibration measurement technology—including high-sensitivity accelerometers and laser-based sensors—to precisely determine both unbalance magnitude and angular position in single- or dual-plane configurations.
With Unbalance Reduction Rates (URR) of ≥95% and residual imbalance levels as low as ≤0.1 g·mm/kg, SINOTEST balancers deliver world-class precision trusted by automotive Tier 1 suppliers, motor manufacturers, fan producers, and precision engineering workshops worldwide. The result: smoother operation, reduced vibration and noise, and significantly extended bearing life.
Rotor Balancers
SINOTEST rotor balancers are designed for a wide range of motor and industrial rotor applications, including universal motors, brushless systems, and new energy drive technologies.
Product Series
- Cross Pole Rotor Series: XH-7605L, XH-7605S, XH-7602
- Brushless Motor Rotor Series: XH-9600A, XH-9600B
- New Energy Motor Series: XH-8605A, XH-8610A, XH-4800
- Vacuum Cleaner Rotor Series: XH-8601A, SDK-8601A-P
These systems support automatic multi-station balancing and correction, making them ideal for high-efficiency production lines in vacuum cleaners, power tools, and automotive components.
With cycle times as fast as 9–15 seconds and URR ≥95%, they are engineered for high-volume manufacturing environments requiring consistent precision. Seamless automation integration ensures uninterrupted production flow and optimized throughput.
Fan & Blade Balancers
SINOTEST fan and blade balancers are purpose-built for axial fans, centrifugal fans, blowers, and complex bladed assemblies where aerodynamic balance is critical.
Product Series
- Fan Series: SDK-AT20R, SDK-AT20S, SDK-20, SDK-40, SDK-60
- Vertical Balancing Machines: SDK-20B, XH-5601A
- Cross-Flow Fan Series: XH-5QZ
A standout model, the SDK-AT20R Rotary Balancing Machine, features fully automatic glue-based weight correction and supports fan diameters from 40 mm to 140 mm.
With throughput of 100–130 units per hour and advanced triple-plane balancing capability, these systems achieve correction accuracy down to 0.2 mg. They are ideally suited for high-speed production environments requiring both speed and ultra-fine precision.
Disc & Hub Balancers
SINOTEST disc and hub balancers are optimized for rotating disc-shaped components such as flywheels, pulleys, brake discs, gears, and turbine discs.
Product Series
- Vertical Disc Series: DLX3, DLX5, DLX10/16, DLX30/42
- Hard Support Series: XH-QM, XH-WM, XH-WL, XH-DL
These systems support workpieces up to 550 mm in diameter and 42 kg in weight. Correction methods include arc milling, axial drilling, and radial drilling, ensuring flexible adaptation to different production needs.
A three-jaw precision clamping system ensures secure positioning and repeatable accuracy, while servo-driven control enables consistent correction with URR ≥90%. The result is reliable, high-performance balancing for demanding disc applications.
Motor Balancers
SINOTEST motor assembly balancers are designed for complete rotor and motor system balancing, including both AC and DC motor configurations.
Product Series
- Vacuum Cleaner Motor Series: XH-8601A, SDK-8601A-P/T, XH-8601C
- High-Speed Motor Series: XH-8610, XH-8615
- Laser Machine Series: XH-8601AL, XH-8601AL II
These systems are engineered for high-speed brushless and brushed motor production lines. Featuring self-driven operation without external drives, they use precision scissor-cut correction technology and fully automated loading/unloading interfaces.
With operating speeds up to 45,000 RPM, this series is ideal for high-volume manufacturing where speed, consistency, and reliability are essential.
Hard Support & Universal Balancers
SINOTEST heavy-duty balancers are engineered for large, heavy, and industrial rotors using robust hard-bearing support structures designed for maximum stability and durability.
Product Series
- Hard Support Series: XH-QS, XH-QM, XH-WM, XH-WL, XH-WQ, XH-DL
- Universal Joint Driven Series: XH-WM, XH-WL
- Ring Belt Driven Series: XH-QS, XH-QM
These machines support rotors up to 5,000 kg with journal diameters ranging from 10–140 mm, extendable for specialized applications.
Depending on rotor geometry and production requirements, users may select belt-driven or universal joint-driven configurations. Designed for fans, rollers, drums, and large motor rotors, these systems deliver outstanding stability, durability, and repeatability in the most demanding industrial environments.
Working Principle of Dynamic Balancing Machines
A dynamic balancing machine operates by measuring vibration signals generated by uneven mass distribution in a rotating rotor. These signals—produced by centrifugal forces during rotation—are analyzed to determine both the magnitude and angular position of unbalance. Corrective weights are then applied or removed to restore dynamic equilibrium.
Core Working Process
-
Rotation Phase
The rotor is driven at a constant speed. Any mass imbalance generates centrifugal forces, producing measurable vibration. -
Signal Acquisition
Sensors such as piezoelectric accelerometers and optical speed detectors capture vibration and rotational data, converting them into electrical signals. -
Signal Analysis
The measurement system applies signal processing (including Fourier analysis) to isolate key vibration components and calculate unbalance magnitude and phase angle. -
Correction Phase
Based on computed results, corrective actions such as adding balance weights, milling, or drilling are performed until residual unbalance meets tolerance requirements.
Classification of Balancing Machines
By Support Type
- Soft Bearing Machines: Operate above system natural frequency and measure displacement.
- Hard Bearing Machines: Operate below natural frequency and directly measure vibration force.
By Drive Method
- Belt-driven systems
- Coupling-driven systems
- Self-driven systems (highest precision, application-specific)
Industrial Application Value
Dynamic balancing technology is essential across industries such as automotive, energy, aerospace, HVAC, and precision manufacturing. Its benefits include:
- Significant reduction in vibration and noise
- Extended bearing and component lifespan
- Improved energy efficiency
- Enhanced operational safety in high-speed rotating systems
- Prevention of catastrophic rotor failure
As a result, balancing technology is a critical component of modern quality control and advanced manufacturing processes.