planetroll motor Germany planetroll model planetroll price

planetroll motors are devices that place the rotor in a rotating magnetic field, where it obtains torque under the action of the field, causing the rotor to rotate. The rotor is a rotatable conductor, typically squirrel-cage in shape. Invented by electrical engineer Nikola Tesla in 1887. The rotor is a rotatable conductor, typically squirrel-cage in shape. The stator is the non-rotating part of the electric motor, with the main task of generating a rotating magnetic field. The rotating magnetic field is not achieved by mechanical means. Instead, alternating current is passed through pairs of electromagnets, causing their magnetic pole properties to change cyclically, thus equivalent to a rotating magnetic field. Unlike DC motors, this type of motor does not have brushes or slip rings. Depending on the type of AC power used, there are single-phase and three-phase motors; single-phase motors are used in appliances such as washing machines and electric fans, while three-phase motors serve as power equipment in factories.

planetroll motor applications

An induction motor is an AC motor whose speed under load is not in a constant ratio to the frequency of the connected power grid. It also varies with the magnitude of the load. The greater the load torque, the lower the rotor speed. Asynchronous motors include induction motors, doubly-fed asynchronous motors, and AC commutator motors. Induction motors are the most widely used; where no misunderstanding or confusion arises, induction motors are generally referred to as asynchronous motors. In standard asynchronous motors, the stator windings are connected to the AC grid, and the rotor windings do not need to be connected to another power source. Therefore, they offer advantages such as simple structure, ease of manufacturing, use, and maintenance, reliable operation, lighter weight, and lower cost. Asynchronous motors have high operating efficiency and good performance characteristics, running at near-constant speed from no-load to full-load, meeting the transmission requirements of most industrial and agricultural machinery. Asynchronous motors can also be easily adapted into various protective enclosures to suit different environmental conditions. During operation, asynchronous motors must draw reactive excitation power from the grid, which worsens the grid's power factor. Therefore, synchronous motors are often used for driving high-power, low-speed mechanical equipment such as ball mills and compressors. Since the speed of an asynchronous motor has a certain slip relationship with its rotating magnetic field speed, its speed regulation performance is poor (except for AC commutator motors). For transportation machinery, rolling mills, large machine tools, dyeing and papermaking machinery, etc., which require a wide and smooth speed regulation range, using DC motors is more economical and convenient. However, with the development of high-power electronic devices and AC speed control systems, the speed regulation performance and economy of asynchronous motors suitable for wide speed regulation can now compare with those of DC motors. Asynchronous motors are mainly used as motors, with power ranges from a few watts to tens of thousands of kilowatts. They are the most widely used motors in various sectors of the national economy and in daily life, providing power for various mechanical equipment and household appliances. For example, machine tools, small and medium-sized steel rolling equipment, fans, water pumps, light industrial machinery, metallurgical and mining machinery, etc., mostly use three-phase asynchronous motors (Asynchronous Motor) for drive; household appliances such as electric fans, washing machines, refrigerators, and air conditioners widely use single-phase asynchronous motors. Asynchronous motors can also serve as generators, used in wind power plants and small hydropower stations.

planetroll motor development trends

The successful development of heat-resistant, high-magnetic-performance neodymium-iron-boron permanent magnet materials will enable their important application in high-power permanent magnet synchronous motors. Demand for high-power motors is growing in transportation and industry, such as in electric vehicles, hybrid (internal combustion engine and motor combined) power vehicles, trains, elevators, machine tools, and robots. Marine propulsion motors require low speed and high torque. Traditional motors are difficult to use in special occasions such as high temperature, high vacuum, or confined spaces, whereas rare-earth permanent magnet motors can withstand high temperatures (referring to samarium-cobalt or high-heat-resistance neodymium-iron-boron magnets) and are compact, precisely meeting these special requirements. Motors working in special environments, such as manipulators in aerospace equipment, inspection robots in nuclear energy equipment, and semiconductor manufacturing devices, require high-temperature and high-vacuum motors. Developed are 150W, 3000r/min, three-phase four-pole permanent magnet motors operating in 200℃ ~ 300℃ high temperature and 133.3×10-6Pa vacuum environments, with a diameter of 105mm and length of 145mm, using Sm2Co17 permanent magnets with good high-temperature characteristics.

planetroll motor structure

Motors mainly consist of a stator, rotor, and bearings. The stator mainly consists of a core, three-phase windings, frame, and end shields. The stator core is generally punched and stacked from silicon steel sheets 0.35~0.5 mm thick with an insulating layer on the surface. Slots are uniformly distributed on the inner circle of the core to accommodate the stator windings. The three-phase windings are formed by connecting three structurally identical windings arranged symmetrically with a spatial separation of 120° electrical degrees. The coils of these windings are embedded in the stator slots according to specific rules. Their function is to generate a rotating magnetic field when supplied with three-phase AC power. The frame is typically cast iron; for large asynchronous motors, the frame is generally welded from steel plates, while for miniature motors, the frame is made of cast aluminum. Its function is to fix the stator core and front/rear end shields to support the rotor, and to provide protection and heat dissipation. Closed motors have cooling fins on the outside of the frame to increase the heat dissipation area. Protected motors have ventilation holes in the end shields at both ends of the frame, allowing direct convection of air inside and outside the motor to facilitate heat dissipation. End shields mainly serve to fix the rotor, providing support and protection. The rotor mainly consists of a core and windings. The material used for the rotor core is the same as that of the stator, punched and stacked from 0.5 mm thick silicon steel sheets. Holes are uniformly distributed on the outer circle of the silicon steel sheets to accommodate the rotor windings. Typically, the inner circle of the silicon steel sheets remaining after punching the stator core is used to punch the rotor core. Generally, the rotor core of small asynchronous motors is directly press-fitted onto the shaft, while the rotor core of large and medium-sized asynchronous motors (rotor diameter above 300~400 mm) is pressed onto the shaft with the help of a rotor spider. Rotor windings are divided into squirrel-cage rotors and wound rotors. (1) Squirrel-cage rotor: The rotor winding consists of multiple conductive bars inserted into the rotor slots and two ring-shaped end rings. If the rotor core is removed, the entire winding resembles a squirrel cage, hence the name cage winding. Small cage motors use cast aluminum rotor windings, while motors above 100KW use copper bars and copper end rings welded together. Squirrel-cage rotors are classified into: impedance-type rotors, single squirrel-cage rotors, double squirrel-cage rotors, and deep-bar rotors, each with different starting torque characteristics. (2) Wound rotor: The wound rotor winding is similar to the stator winding, also a symmetrical three-phase winding, generally connected in star configuration. The three output terminals are connected to three slip rings on the shaft, and then connected to the external circuit via brushes.

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