Motor Vibration and Bearing Noise Inspection
The ECG KOKUSAI MV-20 and MV-20D are motor vibration testers designed to detect vibration, imbalance, and bearing rumbling in small and precision motors.
A high-sensitivity piezoelectric acceleration sensor is applied directly to the motor bearing area to capture mechanical vibration. This approach reduces the influence of surrounding acoustic noise and provides a repeatable alternative to subjective listening-based inspection.
15 Hz to 10 kHz
Three selectable frequency bands
0.05 G to 10 G
Six-range acceleration measurement
Piezoelectric Sensor
Direct bearing-area vibration detection
16-bit / 1 Mword
MV-20D waveform acquisition capability
Measured vibration can also be monitored through the built-in speaker or earphones. External communication functions support integration with automated production inspection equipment.
The MV-20D adds USB communication together with a 16-bit A/D converter and 1 Mword waveform memory, enabling vibration waveform acquisition for FFT analysis and examination of frequency characteristics over time.
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Direct Bearing-Area Vibration Detection
A high-sensitivity acceleration sensor measures mechanical vibration directly at the motor bearing area, reducing the influence of surrounding acoustic noise.
Motor Imbalance and Bearing Noise Detection
Detects vibration associated with motor imbalance together with bearing rumbling and other abnormal mechanical vibration.
Three Selectable Frequency Bands
Selectable Full, Low, and High frequency ranges allow inspection from 15 Hz to 10 kHz.
0.05 G to 10 G Measurement Range
Six acceleration ranges support vibration measurement from 0.05 G to 10 G.
Audible Monitoring
Measured abnormal vibration can be monitored through the built-in speaker or connected earphones.
Production-Line Connectivity
I/O and RS-232C communication support integration with automated motor inspection and production equipment.
MV-20D Digital Waveform Acquisition
The MV-20D adds USB communication, a 16-bit A/D converter, and 1 Mword waveform memory for digital vibration-data acquisition.
FFT Analysis with MV-20D Data
MV-20D waveform data can be used for FFT analysis and evaluation of changes in frequency characteristics over time.
Automatic pass/fail evaluation: the manufacturer states that automatic reject/pass judgment can be implemented using an optional comparator.
Motor bearing noise inspection
Motor imbalance vibration detection
Small precision motor inspection
Automated motor production inspection
Bearing rumble evaluation
Repeatable pass/fail vibration inspection
MV-20D vibration waveform acquisition
MV-20D FFT and frequency analysis
MV-20 / MV-20D Model Comparison
| Specification | MV-20 | MV-20D |
|---|---|---|
| Frequency Range |
Full: 15 Hz to 10 kHz Low: 15 Hz to 1 kHz High: 1 kHz to 10 kHz | |
| Acceleration Measurement Range | 0.05 G to 10 G (6 ranges) | |
| External Output | Maximum 100 mW rms at 32 Ω | |
| Frequency Characteristics |
20 Hz to 8 kHz: ±0.5 dB 15 Hz to 10 kHz: ±1.0 dB | |
| Filter Characteristics | -12 dB/oct | |
| Communication | I/O, RS-232C | I/O, RS-232C, USB |
| A/D Converter | — | 16-bit resolution |
| Waveform Memory | — | 1 Mword |
| Main Unit Operating Environment | 0°C to 40°C / 10% to 70% RH, non-condensing | |
| Power Supply | AC 100 V to 240 V, 50/60 Hz | |
| Power Consumption | 5 VA or less | |
| Main Unit Dimensions | 200 (W) × 130 (H) × 150 (D) mm | |
| Sensor Detection Method | Piezoelectric acceleration | |
| Sensor Charge Sensitivity | 10 pC/m/s² | |
| Sensor Maximum Acceleration | 10,000 m/s² | |
| Sensor Resonant Frequency | 20 kHz or higher | |
| Sensor Operating Environment | -10°C to 80°C / 0% to 90% RH | |
