Uncoated Woodfree Offset Paper,Woodfree Offset Paper,Woodfree Paper,Woodfree Offset Printing Paper Puyang Longfeng Paper Co.,Ltd. , https://www.lonfonpaper.com
Better Motor Alternatives for Variable Speed Pumps
What motors do you use for pumps? For variable speed pump applications that typically use 3-phase AC induction motors with variable frequency drives (VFDs), there is another type of motor that can transfer fluids more consistently and help reduce footprint.
Let's take a look at two typical motor challenges in pump applications.
For many pump applications, such as fluid control, consistent speed is essential. You want to be able to control the rate of fluid transfer so that the same result can be expected. VFDs are able to control the speed of the pump motors by regulating the frequency of the supplied voltage. While there are several types of control methods available, the open loop scalar volts-per-Hertz (V/f) control method is arguably the most common implemented VFD control method in basic applications (e.g., pumps and fans) and has a speed regulation of +/-2~3%. If the application requires more precise speed control, encoders can be added to close the loop, or vector control can be utilized. However, encoders are expensive, and vector control requires a more advanced CPU on the VFD.
It's also important to note that in either open loop scalar (V/f) or vector control, motor response is not guaranteed due to lack of physical feedback. Load fluctuations, which can be caused by a difference in type of fluid or viscosity, can slow the motor down and result in inconsistency in transferred volume.
Brushless motors offer an efficient alternative. They have built-in hall-effect sensor feedback, and their dedicated drivers provide a cost-effective solution for speed regulation. The BMU Series brushless motor systems have a speed regulation of +/-0.2% max. For even greater precision, the BX II Series brushless motors with encoder feedback have a speed regulation spec of +/-0.05% max (at rated speed); regardless of fluctuations in load, voltage, or temperature.
In some cases, the effective speed range can be extended with brushless motors compared to VFD-driven AC motors. Standard brushless motors offer 80~4,000 RPM (50:1 speed ratio), while VFD-driven AC motors offer 90~3,600 RPM (40:1 speed ratio). The constant torque output of brushless motors ensures consistent performance throughout the entire speed range, and the limited duty torque boosts motor torque for dynamic acceleration or deceleration.
Brushless motors are more efficient than AC motors, making them much more compact and helping to reduce energy consumption. They significantly reduce power consumption because the use of permanent magnets in the rotor prevents secondary loss from the rotor, resulting in a large decrease in power consumption (approx. 27%) when compared to AC motors. Brushless motors are also smaller and lighter. For example, when comparing 200 W (1/4 HP) motors, the overall length of the brushless motor is 83 mm shorter and the mass is 3.2 kg lighter.
Additionally, brushless motors do not require built-in cooling fans, which helps prevent dust dispersion or contamination of products such as food, cosmetics, or resin. This makes them ideal for sensitive environments.
Brushless motors also offer better reliability and longevity, as they eliminate the need for brushes, which are prone to wear and tear. This reduces maintenance requirements and increases system uptime.
If you're looking for a reliable, efficient, and compact motor solution for your pump applications, consider exploring the BMU Series brushless motor systems. They offer superior performance, reduced energy consumption, and a smaller footprint, making them an excellent choice for a wide range of industrial and commercial applications.
For more information, visit our website or contact us directly. We're here to help you find the right motor solution for your specific needs.