-
Sensorless Brushless DC Motor Reference Design
motors are well suited for fans. motors evolved from conventional dc motors where the and rotary pumps from a few watts up to about 1 kW. function of the brushes is replaced by electronics. Fans and pumps' loads are predictable and fairly well. Brushless dc motors offer longer life and less behaved
-
Machine Optimization through DC Motor Selection (.pdf)
There are so many motors on the market today, from heavy-duty AC motors to tiny DC brushless and stepper motors. To use any of the motors users must have a full understanding of the application parameters, including power, speed, torque, physical size, efficiency, lifetime expectations, and other
-
Reasons for Turning to Slotless DC Motor Technology
, and noise, as well as preventing smooth motor operation at slow. speeds. A slotless stator offered a solution to the problems experienced with cogging in slotted brushless. DC motors. Slotless Motor Construction. Instead of winding copper wires through slots in a laminated steel stack as in conventional
-
Vacuum pumps
are the major types of nonpositive-displacement pumps, generally operating at high speeds and attaining moderate vacuum levels. Centrifugal blowers, for example, are an excellent choice where only intermittent use is required. To keep costs down, a short-life brush-type ac or dc motor powers
-
Oceanic probes float free -- thanks to a brush-dc motor
specific depth is as easy as controlling the amount of oil in the bladder. As oil is practically noncompressible, flotation control can be maintained over any depth. The piston pump in the Optimare float is handled by a 26-W dc micromotor and compact drive from Faulhaber Corp. The motor drives
-
Micro-Dispensing Liquid Pump
and down," says Stephan Kaufmann, head of development and design at KNF Flodos AG. A pump controlled by a dc motor or brushless motor can work very well in continuous applications, but to dispense a very accurate amount of liquid, Kaufmann says it is difficult to control and precise metering solutions
-
Preface - Pump Handbook
behavior involved. In regard to transients, these latter two sections, as well as the updated and renamed earlier section, Centrifugal Pumps: Hydraulic Performance and Behavior, present the "complete characteristics," "four-quadrant," or "abnormal" behavior of pumps - both theory and test data
-
Straight Talk on Wobble-Piston Pumps
or as high as 212°F. The quality of air surrounding the pump, whether clean, dusty, humid, dry, or containing volatile gases, determines filtration and sealing requirements. Media. Chemicals and moisture in the air, as well as media temperature, affect pump sizing and construction. For example, piston-cup