SSB motor, Germany SSB model, SSB price

SSB motor refers to a motor that can operate continuously under standard environmental conditions at 100% rated load within the 10%~100% rated speed range, with temperature rise not exceeding the motor's specified allowable value. When the slip ratio of an asynchronous motor does not change significantly, the speed is proportional to the frequency; thus, changing the power supply frequency changes the speed of the asynchronous motor. During variable frequency speed control, it is always desired to keep the main magnetic flux constant. If the main magnetic flux is greater than the flux during normal operation, the magnetic circuit becomes oversaturated, causing an increase in excitation current and a decrease in power factor; if the main magnetic flux is less than the flux during normal operation, the motor torque decreases.

SSB motor applications

Application of motors in precision machining: To improve productivity and enhance machining quality, ultra-high-speed and ultra-high-precision machining are key. Currently, the requirements for the feed speed of CNC machine tools have increased from 6～8m/min to greater than 50～60m/min, with acceleration requirements reaching 1～5g. This specification cannot be achieved by traditional feed drive systems with intermediate transmission and conversion links, necessitating the search for a new actuator. This has led to the emergence of the new generation of linear motor feed drive systems. Since the end of the 20th century, major international machine tool exhibitions worldwide have shown that the direct application of linear motors in CNC machine tools, machining centers, and presses is a trend. Linear motor drives feature high thrust, high speed, high precision, and smooth feed motion. The machine tool feed system adopts direct drive by linear synchronous motors. The biggest difference from the original rotary motor transmission method is the elimination of the mechanical intermediate transmission link between the motor and the worktable (slide), i.e., reducing the length of the machine tool feed transmission chain to zero; hence, this transmission method is called "direct drive," also known as "zero transmission." Direct drive avoids disadvantages such as backlash, inertia, friction, and insufficient rigidity in lead screw transmission, bringing performance indicators and advantages unattainable by the original rotary motor drive method.

SSB motor classification

The motor drive current is strictly AC; brushless DC motors can be further divided into brushless speed motors and brushless torque motors. Generally, there are two types of drive currents for brushless motors: one is trapezoidal wave (usually "square wave"), and the other is sine wave. Sometimes the former is called a DC brushless motor, and the latter is called an AC servo motor, which is strictly speaking a type of AC servo motor. To reduce rotational inertia, brushless DC motors usually adopt a "slender" structure. Brushless DC motors are much smaller in weight and volume than brushed DC motors, and the corresponding rotational inertia can be reduced by about 40%—50%. Due to processing issues with permanent magnet materials, the general capacity of brushless DC motors is below 100kW. This type of motor has good linearity in mechanical and regulation characteristics, a wide speed regulation range, long life, convenient maintenance, low noise, and does not suffer from a series of problems caused by brushes, so this type of motor has great application potential in control systems. The stator windings of the motor are mostly made into three-phase symmetrical star connections, very similar to three-phase asynchronous motors. The rotor of the motor is bonded with magnetized permanent magnets. To detect the polarity of the motor rotor, position sensors are installed inside the motor. The driver consists of power electronic devices and integrated circuits, etc., and its functions are: to accept start, stop, and brake signals of the motor to control the start, stop, and braking of the motor; to accept position sensor signals and forward/reverse signals to control the on/off of each power tube in the inverter bridge to generate continuous torque; to accept speed commands and speed feedback signals to control and adjust the speed; to provide protection and display, etc. Since brushless DC motors operate in a self-controlled manner, they do not require additional starting windings on the rotor like synchronous motors under heavy-load start-up with variable frequency speed control, nor do they produce oscillation and step-out when the load changes suddenly. The permanent magnets of small and medium-capacity brushless DC motors mostly use rare earth neodymium iron boron (Nd-Fe-B) materials with high magnetic energy product. Therefore, the volume of rare earth permanent magnet brushless motors is reduced by one frame size compared to three-phase asynchronous motors of the same capacity. Over the past thirty years, research on variable frequency speed control of asynchronous motors has ultimately been seeking methods to control the torque of asynchronous motors. Rare earth permanent magnet brushless DC motors will surely show advantages in the field of speed control due to their wide speed regulation, small volume, high efficiency, and small steady-state speed error. Because brushless DC motors have the characteristics of DC brushed motors and are also frequency-changing devices, they are also known as DC variable frequency, with the internationally common term being BLDC. The operating efficiency, low-speed torque, and speed accuracy of brushless DC motors are better than any variable frequency drive with control technology, so they deserve industry attention. This product has been produced exceeding 55kW, and can be designed up to 400kW, meeting the industry's needs for energy saving and high-performance drive.

SSB motor applications

Motors have broad application prospects in the following aspects: (1) High-speed motors are applied in various occasions such as centrifugal compressors in air conditioners or refrigerators, and with the development of science and technology, special requirements are increasing, so their application will become more widespread. (2) With the development of hybrid electric vehicles in the automotive industry, high-speed generators with small volume and light weight will receive full attention and have good application prospects in hybrid electric vehicles, aviation, ships, and other fields. (3) High-speed generators driven by gas turbines have small volume and high mobility, and can be used as backup power for important facilities, or as independent power sources or small power stations to make up for the shortcomings of centralized power supply, having important practical value. Since the centrifugal force on the rotor of a high-speed motor is proportional to the square of the linear velocity, high-speed motors require high mechanical strength; also, due to the high frequency and large iron loss of high-speed motors, the magnetic density in the iron core should be appropriately reduced during design, and low-loss iron core materials should be used. Bearing research is also inseparable from high-speed motors, because ordinary bearings are difficult to withstand long-term operation in high-speed systems, so bearings with new materials and new structures must be used. High-speed motors can have various structural forms, such as induction motors, permanent magnet motors, and reluctance motors. The centrifugal force is very large when the motor rotates at high speed. When the linear velocity reaches above 200m/s, conventional laminated rotors are difficult to withstand the centrifugal force generated by high-speed rotation, requiring special high-strength laminated or solid rotors. In the nearly hundred-year history of the development of rotor dynamics, many calculation methods have appeared. Modern calculation methods can mainly be divided into two categories: the transfer matrix method and the finite element method. The expression of the motion equation in the finite element method is concise and standardized, and it has many advantages when solving rotor dynamics problems or problems of complex mechanical systems composed of the rotor and surrounding structures. The finite element method involves massive subdivision of complex rotor systems, and the calculation results are more accurate than the transfer matrix method, but the calculation time is long and it occupies large memory. The development of modern computer technology has provided good hardware technology for the finite element method.

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