Not all cooling fans are created equal. For many engineering applications, standard fans may not meet specific performance or integration requirements. SANYO DENKI offers custom modifications, particularly to PWM control and sensor outputs, that can improve efficiency, enhance precision, and simplify system integration. As an authorised supplier, we help engineers access these options and select fans tailored to their needs.

PWM Control Modifications: Precise Fan Speed Management

PWM (Pulse Width Modulation) control determines how a fan responds to control signals. By fine-tuning PWM behaviour, it is possible to achieve more precise speed management and better cooling performance.

  • Standard operation: Most fans operate between 20% to 100% PWM duty, with 0% duty stopping the fan (0 RPM).

  • Custom requirement: Some applications need a fan to continue running at a set speed, even when the PWM signal is 0%. For instance, a fan can be modified to maintain 3,000 RPM at 0% PWM duty, ensuring continuous cooling in critical applications.

These modifications give engineers greater flexibility when designing systems that cannot tolerate cooling interruptions.

Sensor Modifications: Improved Feedback and Integration

Fan sensors provide pulses that help systems monitor speed. Standard fans typically output 2 pulses per revolution. However, some applications require higher-resolution feedback.

  • Enhanced precision: SANYO DENKI can increase the pulse output to 6 pulses per revolution, giving more granular feedback for system monitoring.

  • Integration benefits: Higher pulse rates can simplify hardware and software development, removing the need for external monitoring components.

For engineers, this means easier integration into complex systems without compromising reliability.

Example: Custom PWM and Sensor Adjustments

A customer once required a fan without speed control, while the catalogue only offered 4-wire fans with PWM:

  • The PWM wire was removed to convert the fan into a 2-wire configuration.

  • Sensor output was modified to 6 pulses per revolution for better system feedback.

  • The result was a simpler, high-performance cooling solution that met design requirements.

This demonstrates how SANYO DENKI’s customisation options can solve specific engineering challenges.

Quality Assurance: 100% Inspection

All fans, whether standard or customised, undergo rigorous quality checks. For engineers, this ensures confidence in both performance and reliability:

  • Each unit is 100% inspected before shipment.

  • End-of-line inspection is available for fan assemblies, providing additional assurance for critical applications.

Conclusion

PWM control and sensor modifications are essential tools for engineers optimising cooling systems. By leveraging SANYO DENKI’s expertise, available through our supply network, engineers can:

  • Achieve precise speed control.

  • Simplify system integration.

  • Ensure reliable, uninterrupted cooling.

Discover the full range of SANYO DENKI fans for your custom cooling needs here.