The medical centrifuge is a typical example of analog technology.

　　 Medical centrifuge Digital display technology is a typical manifestation of analog technology, where operational parameters—such as rotational speed, temperature, and time—are selected by turning knobs, and data are indicated by pointers on dials. Its drawbacks include significant human-induced interference in both parameter selection and data reading, leading to poor control accuracy. Moreover, this process must be repeated every time, resulting in poor repeatability. Although some centrifuges feature digital displays (e.g., using knobs for value selection while displaying numbers), despite improvements in readability, the underlying principle remains analog technology. A true digital display, on the other hand, takes the form of a user-friendly interface, keyboard-based operation, digital numerical display, and fully computer-controlled programmable functions. At its core lies intelligent control, which is realized by computers. All parameters required for centrifuge operation—such as rotational speed, temperature, time, acceleration/deceleration rates, and others—are entered via keyboard input and displayed digitally. Consequently, errors in selecting operational parameters and reading values are minimized. Furthermore, since these operations are programmable, a set of operational parameters can be assigned specific codes and stored for future use.
　　In today’s society, the production of medical centrifuges is mainly concentrated in Beijing, Shanghai, and Hunan. The process involved in these centrifuges is relatively simple; typically, they employ area centrifuges or regional centrifuges that separate and collect cells, viruses, and deoxyribonucleic acid (DNA) based on the density of the sample solution. Samples are processed continuously, both during the initial sampling and subsequent addition of additional samples. These centrifuges are widely used in laboratory equipment and have become extensively adopted in industrial production processes as well. Due to... Medical centrifuge DC inverter motors or brushless DC motors generally offer adjustable speeds and achieve higher rotational speeds. To reduce weight, drums, and external plastics—or other commonly used alloy materials that don't readily respond—internal components often employ lightweight alloys or other materials that can effectively react.
　　In laboratory testing, medical centrifuges are frequently started and stopped, with usage concentrated over relatively short periods. As a result, the motors and mechanical components experience significant wear and tear. If maintenance and repairs are not performed regularly and on time, the centrifuge is highly likely to malfunction—either failing to start at all or running at a reduced speed—thus directly disrupting the normal conduct of testing work. Therefore, it is crucial to master methods for promptly and efficiently troubleshooting various centrifuge malfunctions and ensuring that the centrifuge remains in perfect working condition at all times.
　　This is because the motors used in medical centrifuges are typically series-wound motors. Such a motor consists of two main parts: the stator and the rotor. The stator comprises a centralized, fixed magnetic pole made up of an iron core and magnetic field coils. The rotor consists of an iron core, rotor coils, and a commutator. The brushes serve as crucial components that connect the stator coils to the rotor coils via the commutator. The operating principle of the series-wound motor's circuit is as follows: current flows from the power source through the stator’s magnetic field coils, then via the brushes and commutator into the rotor coils, and finally returns to the power source through the brushes and stator’s magnetic field coils, thus forming a closed circuit. The magnetic field coils and rotor coils are connected in series through the commutator and brushes. Since the current is the same at every point in the circuit, the motor can only operate normally at the desired speed if the series circuit remains unobstructed and free of any blockages.
　　As a result, the operating condition of the brushes directly affects the normal operation of the motor. However, due to factors such as wear and tear, consumption, or spring failure during the brushes' contact with the commutator, the brushes are prone to open circuits and lose contact with the commutator, which leads to... Medical centrifuge The main causes of shutdown or slow-speed failures.