SEW-EURODRIVE motors Germany SEW-EURODRIVE models SEW-EURODRIVE prices

SEW-EURODRIVE motors are discrete-value control motors that convert electrical pulse excitation signals into corresponding angular or linear displacements. These motors move one step for each input electrical pulse, so they are also called pulse motors. They are micro-specialized motors that convert electrical pulse signals into angular displacement to control rotor rotation. They serve as actuators in automatic control devices. For each input pulse signal, the stepper motor advances one step, hence the name pulse motor. Stepper motors are widely used in peripheral equipment of digital computers, as well as in printers, plotters, and disk drives. The drive power supply for stepper motors consists of a variable-frequency pulse signal source, a pulse distributor, and a pulse amplifier, which provide pulse current to the motor windings. The operating performance of a stepper motor depends on the proper matching between the motor and the drive power supply. The advantages of stepper motors include no cumulative error, simple structure, ease of use and maintenance, low manufacturing cost, and high ability to drive load inertia. They are suitable for small and medium-sized machine tools and applications with low speed and precision requirements. The disadvantages include lower efficiency, significant heat generation, and occasional "step loss."

SEW-EURODRIVE motor excitation methods

Motor excitation methods refer to the ways magnetic fields are generated in rotating electrical machines. DC motor excitation methods are divided into four types: separately excited DC motors, shunt-excited DC motors, series-excited DC motors, and compound-excited DC motors. A DC motor in which the field winding has no connection to the armature winding and is supplied by another DC power source is called a separately excited DC motor. Permanent magnet DC motors can also be regarded as separately excited or self-excited DC motors, but their excitation method is generally referred to directly as permanent magnet. In shunt-excited DC motors, the field winding is connected in parallel with the armature winding. As a shunt generator, the terminal voltage generated by the motor itself supplies the field winding; as a shunt motor, the field winding and the armature share the same power source, and its performance is identical to that of a separately excited DC motor. In series-excited DC motors, the field winding is connected in series with the armature winding, and then connected to the DC power source. The excitation current of this type of DC motor is the armature current. Compound-excited DC motors have two field windings: shunt and series. If the magnetomotive force produced by the series winding is in the same direction as that produced by the shunt winding, it is called cumulative compound excitation. If the two magnetomotive forces are in opposite directions, it is called differential compound excitation. DC motors with different excitation methods have different characteristics. Generally, the main excitation methods for DC motors are shunt, series, and compound; the main excitation methods for DC generators are separate, shunt, and compound.

SEW-EURODRIVE motor classification

Motors are divided into three basic types: electromechanical, magneto-electric, and linear. Electromechanical stepper motors consist of iron cores, coils, gear mechanisms, and other components. When the solenoid coil is energized, it generates magnetic force, pushing the iron core to move. The output shaft rotates by an angle through the gear mechanism, and an anti-rotation gear holds the output shaft in the new working position. When the coil is energized again, the shaft rotates by another angle, performing step-by-step motion. Magneto-electric stepper motors have a simple structure, high reliability, low price, and wide application. They mainly include permanent magnet, variable reluctance, and hybrid types. The rotor has permanent magnet poles that generate alternating polarity magnetic fields in the air gap, and the stator consists of four-phase windings. When the A phase winding is energized, the rotor turns toward the magnetic field direction determined by that phase winding. When the A phase is de-energized and the B phase winding is energized, a new magnetic field direction is generated. At this point, the rotor rotates by an angle to align with the new magnetic field direction. The sequence of energized phases determines the direction of rotor rotation. If the change in stator excitation is too fast, the rotor cannot keep up with the change in the stator magnetic field direction, resulting in step loss. Low starting and operating frequencies are a disadvantage of permanent magnet stepper motors. However, permanent magnet stepper motors consume less power and have higher efficiency. In the early 80s of the 20 century, disc-type permanent magnet stepper motors with disc-shaped rotors appeared, bringing the step angle and operating frequency to the level of variable reluctance stepper motors.

SEW-EURODRIVE motor structure

The rotor of a motor consists of the rotor core, rotor windings, and shaft. The rotor core is also part of the motor's magnetic circuit and is made of stacked silicon steel sheets. Unlike the stator core laminations, the rotor core laminations have slots cut on the outer circumference. After stacking, the outer cylindrical surface of the rotor core uniformly forms many slots of the same shape to house the rotor windings. The rotor winding is another part of the induction motor circuit. Its function is to cut the stator magnetic field, generate induced electromotive force and current, and rotate the rotor under the force of the magnetic field. Its structure can be divided into two types: squirrel-cage windings and wound rotors. The main characteristics of these two rotors are: squirrel-cage rotors have a simple structure, are easy to manufacture, economical, and durable; wound rotors have a complex structure and are expensive, but external resistance can be introduced into the rotor circuit to improve starting and speed regulation performance. Squirrel-cage rotor windings consist of conductor bars placed in the rotor slots and end rings at both ends. To save steel and increase productivity, the conductor bars and end rings of low-power induction motors are usually cast in one piece from molten aluminum. For high-power motors, since the quality of cast aluminum is difficult to guarantee, copper bars are often inserted into the rotor core slots, and end rings are welded to both ends. The squirrel-cage rotor winding is self-closed and does not require an external power supply. Its shape resembles a cage, hence the name squirrel-cage rotor.

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