The process of drying electric motors after cleaning has long presented a significant challenge for the industry. Traditional high-temperature electric heating methods risk damaging motor insulation materials, creating a persistent problem that demands innovative solutions. Nomura Industrial Electric has pioneered a breakthrough approach using vacuum drying technology, offering a superior alternative that eliminates the risks associated with conventional methods.

The Science Behind Vacuum Drying: Low-Temperature Efficiency

Vacuum drying operates on a fundamental physical principle: reducing environmental pressure significantly lowers water's boiling point. While water boils at 100°C (212°F) under standard atmospheric pressure, vacuum conditions allow evaporation to occur at much lower temperatures. Nomura's vacuum drying equipment leverages this principle by creating a low-pressure environment where moisture within the motor vaporizes at reduced temperatures.

Comparative Analysis: Electric Heating vs. Vacuum Drying

Conventional electric heating methods typically operate at temperatures between 105°C and 110°C (221°F-230°F), using intense heat to evaporate moisture. While straightforward, this approach carries inherent risks:

• Thermal damage to insulation materials
• Reduced motor performance and lifespan
• Extended drying times and lower efficiency

Vacuum drying offers distinct advantages:

• Low-temperature operation: Protects insulation materials by enabling evaporation at reduced temperatures
• Enhanced efficiency: Accelerated moisture removal significantly reduces drying time
• Uniform drying: Ensures consistent moisture removal without localized overheating

Nomura's Vacuum Drying System: Technical Innovations

Since introducing vacuum drying technology in 2017, Nomura has continuously refined its systems, which now feature:

• Precision temperature control: Adjustable settings between 35°C and 65°C (95°F-149°F), with capability for higher temperatures when required
• Variable pressure regulation: Customizable pressure settings for optimal drying conditions
• Automated operation: Proprietary Ver.2 control system enables fully automated processing
• Real-time monitoring: Continuous measurement of insulation resistance with data logging capabilities

Intelligent Control System Features

Nomura's proprietary Ver.2 control system incorporates several advanced functions:

1. Automatic preheating: System preheats the chamber before initiating vacuum drying
2. Dynamic pressure management: Maintains consistent vacuum levels throughout the process
3. Insulation monitoring: Regular automated resistance measurements displayed in real-time
4. Data management: Comprehensive recording of all measurements in CSV format for analysis

Technical Specifications

The Physics of Vacuum Drying

The technology operates on the well-established relationship between atmospheric pressure and boiling points. By reducing chamber pressure using vacuum pumps, moisture within the motor vaporizes at temperatures significantly below 100°C. The system combines this pressure reduction with precisely controlled heating to optimize the drying process.

This innovative approach represents a significant advancement in motor maintenance technology, offering manufacturers and service providers a reliable method to extend equipment lifespan while improving operational efficiency.