Nidec UltraFlo™ cooling fans and blowers
V12E Series Adds 24V Fans
to High-Performance Lineup		 New 24V Models for V12E Series

The full scope of high-end performance offered by the UltraFlo® V12E M9 series of cooling fans is now available to 24V applications.

The addition of 10 new 24V vane axial models includes both free-running and feedback-governed, speed-stable versions that span the broad PQ operating range of the popular Nidec 120 x 38mm series. All are offered with a comprehensive array of monitor and control options.

On-line documentation of the expanded V12E series is available here:

Speed-Stable V12E M9 Fans
Free-Running V12E M9 Fans

To modulate the speed of the motor for thermal sensing and to modulate the current of the motor for current limiting the following method was employed.

Here we have the familiar 2 phase Unipolar driver; however, CRA and CRB have been added to allow a PWM override signal to shut the switch off.

At first glance this would appear to be elegantly simple; PWM the switch at 50% duty cycle, and © the effective voltage would appear across the winding.

Instead of 12v applied we would have 12v applied at 50% of the time giving an effective winding voltage of 6v, causing the motor to run at 1500 RPM instead of 3000 RPM.

It does not operate that way however. If this were implemented one would find the motor/fan to be operating at around 400 to 600 RPM and might have difficulty starting in the detent position.

® UltraFlo is a registered trademark of Nidec Corporation.

Contact! Home Cooling Fans Brushless DC Motors Spindle Motors

Nidec three-phase brushless dc motors for plain paper copiers, laser beam printers, air moving devices, hybrid vehicle battery coolers, and automotive seat coolers. Models 58M 50M 50ML 45M and 40M outer rotor motors: Nidec motors.

White Technology Solutions, Raleigh, NC, phone 919-801-4859 or 919-870-9797, is a manufacturer's sales representative for Nidec UltraFlo cooling fans and blowers and Nidec Servo fans.