Pa66 Similar Ebm-Past Fresh Air System Proect The Environment
1. What’s so special about an EC fan?
1.1 EC fans are generally recognised as being the latest thing in
energy efficient air movement technology, but what is an EC fan and
what makes it so special?
1.2 Although OFAN, the market leader in EC technology, is a China
company, EC has nothing to do with the European Community! In this
case, EC stands for Electronically Commutated which basically means
it is a fan with a brushless DC motor
2. Control options
To control the motor accurately and efficiently the integrated
electronics have to continuously monitor the motor speed and adjust
the control input. By making this circuitry available to external
sources it’s possible to provide simple speed control options.
Dependent on the motor type, any sensor which can provide a
0-10V/PWM or 4-20mA input can be directly connected to provide
closed loop control for temperature, pressure or whatever parameter
you choose to measure. No need to worry about DC supplies for the
sensors either, this is provided by another connection on the
motor. In fact, simply connect a potentiometer and you have
infinitely variable speed control. No triacs, no frequency
inverters and no whining noises! An EC motor under speed control is
3. How does this affect energy efficiency?
3.1 Doubling the speed of a motor increases its power input by a
factor of 8 so it’s very wasteful to run a fan faster than is
required. If you can tailor the fan speed to match the demand, the
potential for energy saving is huge. Even when compared to on/off
operation, EC speed modulation is much more efficient.
3.2 EC fans can also contribute to increasing the overall
efficiency of an application. In a cooling system for example,
keeping the refrigerant pressure constant rather than having it
rise and fall as fans switch on and off has been found to reduce
the load on the compressor resulting in even greater energy saving.
4. AC vs. EC
4.1 AC motors are designed to operate at a certain point on their
performance curve which coincides with their peak efficiency.
Either side of this operating point, the efficiency can drop off
considerably. EC motors on the other hand have an almost flat
efficiency curve which varies relatively little across the speed
range, a range which is not limited by synchronous speeds or as
susceptible to voltage fluctuations as an AC motor. This makes the
EC fan much more flexible in terms of being able to use the same
product to match the performance requirements of different
applications while still benefitting from increased efficiency.
4.2 The available range of AC input EC fans is expanding all of the
time. There are axial and centrifugal fans, forward curved and
backward curved, single inlet and double inlet, single phase and
three phase and they are often directly interchangeable with their
AC equivalents. EC offers the OEM more than just energy-efficiency.
It is an opportunity to bring new technology and functionality to
their products. With ever-increasing demand for energy efficient
systems, when it comes to fan based products, there’s no reason for
manufacturers not to have any in their portfolio.
5. OFAN EC products offer you:
stepless and infinitely variable speed control
fully integrated, mains input power supplies
compact motors making them fully interchangeable with AC products
fully sealed electronics
Having successfully integrated our advanced electronics into the
motor, we realised that it would be a waste to only use it for
turning the motor. Our large motors have full programmable
networking capability for integration with BMS systems or can be
individually programmed with a PDA connected via Bluetooth.
Constant volume or constant pressure functionality is easily
achieved with the connection of one simple sensor or, in some
cases, without any external sensors at all. Silent, infinitely
adjustable speed control can be as simple as connecting a
potentiometer to the motor. Commissioning becomes simplicity itself
1. Are you a factory or trading company?
We are a factory which specialized in produce external rotor motor
about 10 years. We accept OEM or ODM
2. How do I know which model I should choose
Please tell us the fans pressure and airflow and size of fans’
diameter you need. We will study and suggest you the right model.
3. Can we buy a sample for testing?
Sure, you are welcomed to buy a sample before mass order.
4. if the fans doesn't work well, what shall I do ?
If happens within one year, we will take in charge of the
maintenance, or send you a new machine freely.
If after one year, we will supply you the right parts to replace at
5. What about delivery date?
Product can be sent to you within a week if there is stock after
receiving deposit or 100% payment from customer. If there is no
stock, the delivery date will be 15 to 30 days