DC Fans & Blowers
Brushless DC Fans and Blowers
Here you will find additional information about Mechatronics DC fans and blowers. Mechatronics engineering team is available to assist with choosing the right fan options as well as development of custom thermal management solutions to meet your requirements. Please contact Mechatronics with your engineering requirements.
General Specifications*
- Frame Construction: Thermoplastic (UL94V-0) or Metal
- Impeller Construction: Thermoplastic (UL94V-0)
- Motor: Brushless DC Motor
- Operating Voltage Range
- o5VDC: 4.5 to 6.0VDC
- 12VDC: 5.5 to 14VDC
- 24VDC: 10 to 28VDC
- 48VDC: 24 to 56VDC
- Operating Temp Range: -10°C to 70°C
- Storage Temp Range: -40°C to 70°C
- Insulation Resistance: over 10M at DC 500V
- Dielectric Strength: AC 500V for 1 minute
- Motor Protection: Reverse polarity protection
- Bearings: High precision chrome steel ball bearings or Sintered bronze sleeve
- Safety Certifications
- UL, C-UL File E137077
- TUV
* Actual specifications, tolerances, and safety agency approvals vary by series. Consult Mechatronics for individual specifications.
DC Fan Options
Mechatronics offers a wide range of DC fan options including fan performance monitoring, speed control and environmental protection.
Fan Performance Monitoring
Tachometer Output Signal: Optional tachometer output alarm signal can be used to monitor fan performance. The signal is a 2 pulse per revolution square wave output for 4 pole motors and 4 pulse per revolution for 8 pole motors.
Different signal output voltages available include:
Open Collector Output:
- Open collector - Requires a pull up resistor in customer application as the signal does not have driven output voltage.
Driven Voltage Output:
- TTL Compatible (5vdc) – fan includes an internal pull up resistor to drive output signal at 5vdc for direct TTL compatibility.
- Source Voltage Output – fan includes an internal pull up resistor to drive output signal at the same voltage as the fan supply voltage (12vdc fan = 12vdc alarm)
Locked Rotor Alarm Signal: The locked rotor alarm signal can be used to monitor fan rotation. The signal is low during normal fan rotation. The signal switches to high when the impeller is locked.
Inverted locked rotor alarm is also available. The inverted locked rotor alarm signal is high during normal fan operation and drops to low when the impeller is locked.
Different signal output voltages available include:
Open Collector Output:
- Open collector - Requires a pull up resistor in customer application as the signal does not have driven output voltage.
Driven Voltage Output:
- TTL Compatible (5vdc) – fan includes an internal pull up resistor to drive output signal at 5vdc for direct TTL compatibility.
- Source Voltage Output – fan includes an internal pull up resistor to drive output signal at the same voltage as the fan supply voltage (12vdc fan = 12vdc alarm)
Fan Speed Control
PWM Speed Control: This option allows for speed adjustment of the fan in the customer application via a customer supplied Pulse Width Modulation (PWM) signal into the fan through a separate input wire. Fan speeds can be controlled via the PWM duty cycle from 0% to 100%. The recommended PWM frequency is 25kHz +/- 5kHz, and the voltage should be 0vdc ~ 5vdc. Fans can be configured to stop at 0% PWM or continue to operate at 0% PWM.
Thermistor Speed Control: Thermistor in the fan senses ambient temperature and adjusts the fan speed accordingly. At 25° C or less, the fan will operate at approximately half speed. At 35° C or greater, the fan will operate at full speed. Between 25° and 35° C, the fan speed will automatically adjust speed linearly based on the ambient temperature. There are 2 thermistor location options:
- Hub Mount - Thermistor is mounted on the fan hub. With this configuration, the fan senses the temperature of the air as it flows through the fan and adjusts the speed accordingly.
- Remote Mount - Thermistor is mounted on the end of 12" lead wires. The thermistor can be placed in a location away from the fan to sense the ambient temperature and adjust the fan speed accordingly.
Environmental Protection
Environmental Coatings: Many Mechatronics DC axial models are available with multiple environmental coating options ranging from a light film to full encapsulation. Environmental options are:
- Conformal Coating - Fan motor and PCB are dipped into conformal coating solution prior to assembly into the fan frame. Conformal Coating is designed for light moisture exposure such as condensation.
- Enhanced Conformal Coating - Fan motor and PCB are dipped into conformal coating solution. After solution has cured, a secondary coating of silicone is added over PCB components. Enhanced conformal coating is designed for occasional water splashes.
- Encapsulated Motor - Fan motor and PCB are over molded with polyamide material. Encapsulation is designed for continued water exposure and has been tested to meet IP68 requirements.
Available options vary by model. Custom options may be available upon request. Please contact Mechatronics for details.