Hydraulic Servo Test Bench Base Iron Floor HT300 High-Grade Cast Iron with Impact Resistance and Inspection Report

Selection and Application of Specialized Iron Surface Plates for Motor Performance Test Benches: Key Technologies to Enhance Testing Accuracy
Motor performance testing is a critical process for evaluating core indicators such as motor power, efficiency, torque, and vibration. The specialized iron surface plate, serving as the benchmark carrier for the test bench, directly determines the reliability of test data. In motor testing, even a flatness deviation of 0.01mm or a vibration interference of 0.05g can lead to torque measurement errors exceeding 5% and rotational speed detection deviations of over 10r/min. This article focuses on the specific requirements of motor performance test benches, detailing the key selection points and application technologies for iron surface plates, helping enterprises significantly improve motor testing accuracy through scientific selection and standardized application.
I. Selection of Iron Surface Plates for Motor Performance Test Benches: Targeting Three Core Requirements
1. Precision Matching: Meeting the Micron-Level Benchmark Requirements of Motor Testing
Motor test benches have stringent requirements for the flatness and parallelism of iron surface plates, necessitating differentiated selection based on the precision grade of the motor under test:
Small and medium-sized motors (e.g., servo motors, precision grade ≤0.1): Use Grade 00 cast iron surface plates with flatness error ≤0.01mm/m, working surface contact points ≥30 points/25mm×25mm, ensuring a motor base-to-test bench fit rate ≥95% to avoid coaxiality errors caused by installation deviations;
Large industrial motors (e.g., asynchronous motors, power ≥100kW): Grade 0 iron surface plates can be used with flatness error ≤0.02mm/m, but additional machining of pin holes (tolerance H7) is required, with hole position deviation ≤±0.02mm, using pins to connect the motor to the test equipment and reduce the impact of radial runout on torque testing.
Additionally, the surface roughness of the iron surface plate must be controlled within Ra0.8-1.6μm to reduce friction noise between the motor base and the plate during operation, avoiding interference with vibration test data.
2. Vibration Resistance: Isolating Vibration Interference in Testing
Electromagnetic vibrations during motor operation (frequency 20-500Hz) and external environmental vibrations (e.g., workshop equipment operation) are major factors affecting testing accuracy. Selection must focus on vibration transmissibility and damping characteristics:
Prioritize iron surface plates with a "cast iron base plate + damping layer" composite structure. The base plate should be made of HT300 gray cast iron (tensile strength ≥300MPa), and the damping layer should use rubber (thickness 20-30mm, Shore hardness 65-70A), which can reduce vibration transmissibility in the 20-200Hz frequency range by over 70%;
For testing projects involving high-frequency vibrations (e.g., motor noise testing), air spring vibration isolators (stiffness 5-15N/mm) should be used to control the vibration acceleration of the iron surface plate within 0.005g, ensuring noise testing error ≤1dB.
3. Load Capacity: Adapting to the Weight Requirements of Motors with Different Power Ratings
The load capacity of the iron surface plate must cover the total load of the motor weight and testing fixtures, with a 20%-30% safety margin:
Small motors (weight ≤500kg): Select iron surface plates with dimensions of 1500×2000mm, thickness ≥200mm, rib spacing 300-400mm, rated load capacity ≥1000kg;
Medium motors (weight 1-5t): Use iron surface plates with dimensions of 2000×3000mm, thickness ≥250mm, ribs arranged in a "grid pattern" (spacing 250-300mm), rated load capacity ≥8000kg;
Large motors (weight >5t): Custom modular iron surface plates are required, with individual module thickness ≥300mm, joined by mortise and tenon structures, joint gap ≤0.03mm, overall rated load capacity ≥20000kg, and additional reinforcement ribs (width 100-150mm) installed in the motor mounting area to avoid deformation caused by localized stress concentration.
The selection and application of specialized iron surface plates for motor performance test benches are foundational to enhancing motor testing accuracy. By matching precision grades, vibration resistance, and load capacity, combined with scientific installation calibration, vibration isolation, and fixture adaptation technologies, testing errors for key indicators such as motor torque, rotational speed, and noise can be controlled at a high level. In the fields of motor R&D and quality inspection, paying attention to the details of iron surface plate selection and application not only ensures the accuracy of test data but also provides a reliable basis for motor performance optimization and quality improvement, helping enterprises enhance their competitiveness in motor manufacturing.
Ms. Xie, Qili Machine Tool, 13785751790