The overhead stirrer is an experimental equipment for liquid mixing and stirring, which is suitable for health care products, food, biology, physical and chemical, cosmetics, reagents and other experimental fields. Speed range, control accuracy, maximum mixing viscosity, maximum torque, maximum mixing capacity, motor input/output power, and motor type are all key to evaluating the performance of an overhead agitator. Among them, there are usually two types of motors: brushless motor and brushed motor, so what is the difference between these two types of motors, and what kind of motor should we choose when choosing an overhead agitator?
1. Structural differences
Brushed motors: Brushed motors contain a rotating part (rotor) and a fixed part (stator), where the rotor makes electrical contact with the brushes on the stator through the brushes.
Brushless motor: Brushless motor consists of a rotor and stator, but there is no traditional brush and electric gun structure.
2. How it works
Brushed motor: The brush motor is powered by a DC power supply, and the current enters the stator coil through the brush and the electric gun, which generates a magnetic field interaction that causes the rotor to rotate.
Brushless motor: The brushless motor controls the alternating current (AC) or direct current (DC) power input into the rotor coil through an electronic governor (ESC), and realizes the rotor movement through the induction and drive circuit.
3. Maintenance
Brushed motors: Brushed motors have worn contact parts (brushes and guns) that need to be replaced and maintained regularly.
Brushless motors: Brushless motors have no brushes and guns, so there are fewer wear parts and less maintenance required.
4. Efficiency
Brushed motors: Brushed motors are typically less efficient due to friction and energy loss caused by the contact of the brushes with the rotor.
Brushless motor: The brushless motor precisely controls the power supply mode of the rotor coil through the electronic governor, which reduces energy loss and therefore has higher efficiency.
5. Speed range
Brushed motors: Brushed motors are often suitable for lower speed applications because the contact between the brushes and the rotor can be problematic when rotating at high speeds.
Brushless motors: Brushless motors can achieve a higher speed range due to the absence of brush contact.
6. Control complexity
Brushed motors: Brushed motors can be controlled by simple circuits, such as using a rheostat to change the supply voltage for speed regulation.
Brushless motors: Brushless motors require an electronic governor (ESC) to achieve precise speed and torque control, so the control complexity is higher.
7. Noise and vibration
Brushed motors: Brushed motors have friction and mechanical contact between the brushes and the electric gun, which are prone to noise and vibration.
Brushless motors: Brushless motors are usually less noisy and vibrate because they have no contact parts.
In summary, it is clear that brushless motors are better than brushed motors across the board, and we can give preference to the type of brushless motor used when selecting an overhead agitator.
OHS overhead stirrer
Premium version (3.5-inch TFT display, timer, connection to VELP Ermes cloud platform and USB) or digital version (digital display and timer)
Maximum stirring power, volume up to 100L, 100.000mPa*s, maximum speed of 2000rpm
Speed ServoTM torque compensation technology keeps the speed constant and automatically adjusts to changes in viscosity
The brushless motor maintains a stable torque at any speed. This is a very important parameter for testing reproducibility
The rugged, sealed housing and IP54 protection guarantee durability even in the harshest environments
Chuck guards to protect the operator from contact with the upper part of the chuck and connection to the impeller