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The burkert motor is a device that places the rotor in a rotating magnetic field, where it obtains torque under the action of the rotating magnetic field, causing the rotor to rotate. The rotor is a rotatable conductor, typically in the shape of a squirrel cage. It was invented by electrical engineer Nikola Tesla in 1887. The rotor is a rotatable conductor, typically in the shape of a squirrel cage. 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 several 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 motors and three-phase motors. Single-phase motors are used in applications such as washing machines and electric fans; three-phase motors serve as power equipment in factories.

burkert motor structure

The motor consists of two basic parts: a stationary stator and a rotating rotor. The rotor is installed inside the stator cavity and supported on two end covers via bearings. To ensure the rotor can rotate freely within the stator, there must be a gap between the stator and the rotor, known as the air gap. The air gap of an electric motor is a very important parameter; its size and symmetry significantly affect the motor's performance. Figure 2 shows the components of a three-phase squirrel-cage asynchronous motor. The stator consists of three-phase windings, a stator core, and a frame. The three-phase stator windings are the circuit part of the asynchronous motor and play a crucial role in its operation, being the key component for converting electrical energy into mechanical energy. The structure of the three-phase stator windings is symmetrical, generally having six output terminals U1, U2, V1, V2, W1, W2, located in the junction box on the outside of the frame. They can be connected in a star (Y) or delta (△) configuration as needed. The stator core is part of the magnetic circuit of the asynchronous motor. Since the main magnetic field rotates relative to the stator at synchronous speed, to reduce losses caused in the core, the core is made of stacked high-permeability silicon steel sheets with a thickness of 0.5mm. Both sides of the silicon steel sheets are coated with insulating varnish to reduce eddy current losses in the core. The frame, also known as the housing, mainly supports the stator core and withstands the reaction forces generated during the motor's loaded operation. Heat generated by internal losses during operation is also dissipated outward through the frame. Frames for medium and small motors are generally made of cast iron. For large motors, due to the difficulty of casting large bodies, steel plates are often welded to form the frame.

burkert motor applications

Applications of motors in precision machining: To improve productivity and enhance machining quality, ultra-high-speed and ultra-high-precision machining are key. Currently, the feed speed requirements for 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 stages, 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 uses 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), effectively 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 associated with lead screw transmission, bringing performance indicators and advantages unattainable with original rotary motor drive methods.

burkert motor classification

The motor swaps the stator and rotor of a conventional DC motor. Its rotor uses permanent magnets to generate air gap flux; the stator is the armature, composed of multi-phase windings. Structurally, it is similar to a permanent magnet synchronous motor. The stator structure of a brushless DC motor is the same as that of ordinary synchronous or induction motors. Multi-phase windings (such as three-phase, four-phase, five-phase, etc.) are embedded in the core. The windings can be connected in star or delta configurations and respectively connected to the power transistors of the inverter for proper commutation. The rotor mostly uses rare-earth materials with high coercivity and high remanence density, such as samarium-cobalt or neodymium-iron-boron. Due to different placements of magnetic materials in the poles, they can be classified into surface-mounted poles, embedded poles, and ring-shaped poles. Since the motor body is a permanent magnet motor, brushless DC motors are habitually referred to as permanent magnet brushless DC motors. Brushed DC motor: The 2 brushes (copper or carbon brushes) of a brushed motor are fixed on the rear cover of the motor via an insulating seat, directly introducing the positive and negative poles of the power supply to the commutator on the rotor. The commutator connects the coils on the rotor, and the continuous alternating polarity of the 3 coils interacts with the 2 fixed magnets on the housing to generate torque and rotation. Since the commutator is fixed to the rotor and the brushes are fixed to the housing (stator), friction constantly occurs between the brushes and the commutator when the motor rotates, generating significant resistance and heat. Therefore, brushed motors have low efficiency and high losses. However, they also have the advantages of simple manufacturing and low cost.

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