ELMOT SCHAFER motor Germany ELMOT SCHAFER model ELMOT SCHAFER price

ELMOT SCHAFER motors are a type of motor that changes the motor speed by altering the number of magnetic pole pairs, voltage, current, frequency, and other methods to achieve higher performance. Due to their excellent performance, adjustable-speed motors are widely used in industrial sectors such as steel, power stations, cables, chemicals, petroleum, cement, textiles, printing and dyeing, papermaking, and machinery for stepless speed control of loads with constant torque or decreasing torque. They are particularly suitable for driving pumps and fans with significant flow variations, achieving good energy-saving results

ELMOT SCHAFER motor operating principle

The simplified structure of the relay in the motor consists of an electromagnet mechanism and a contact assembly. The coil is connected to the ignition switch terminal on the housing and the ground terminal "E", respectively. The fixed contact is connected to the starter motor terminal "S", and the moving contact is connected to the battery terminal "BAT" via the contact arm and bracket. The starter relay contacts are normally open. When the coil is energized, the relay core generates electromagnetic force, closing the contacts and thereby connecting the circuits for the pull-in coil and holding coil controlled by the relay. The control circuit includes the starter relay control circuit and the starter motor solenoid switch control circuit. The starter relay control circuit is controlled by the ignition switch, with the relay coil circuit as the controlled object. When the ignition switch is turned to the start position, current flows from the positive terminal of the battery through the starter motor power terminal to the ammeter, then from the ammeter through the ignition switch and relay coil back to the negative terminal of the battery. The relay core then generates strong electromagnetic attraction, closing the relay contacts and connecting the control circuit for the starter motor solenoid switch. Battery positive → Starter motor power terminal → Solenoid switch → Field winding → Armature winding → Ground → Battery negative, causing the starter motor to generate electromagnetic torque and start the engine.

ELMOT SCHAFER motor braking methods

Motor electrical braking methods include: dynamic braking, plugging, and regenerative braking. (1) During dynamic braking, the three-phase AC power supply to the motor is cut off, and DC power is supplied to the stator winding. At the instant the AC power is cut off, due to inertia, the motor continues to rotate in the original direction. This method is characterized by smooth braking but requires a DC power source; for high-power motors, the cost of the required DC equipment is high, and the braking force is low at low speeds. (2) Plugging is divided into load plugging and power supply plugging. Load plugging, also known as load-lowering plugging, allows heavy loads to descend slowly at a stable speed. The characteristics of this braking method are: the power supply does not need to be reversed, no special braking equipment is required, and the braking speed can be adjusted. However, it is only applicable to wound-rotor motors, where a large resistance must be inserted in series into the rotor circuit to make the slip greater than 1. In power supply plugging, when the motor needs to be braked, simply swap any two phase power lines to reverse the rotating magnetic field, achieving rapid braking. When the motor speed reaches zero, the power supply is immediately cut off. The characteristics of this braking method are: quick stopping and strong braking force without the need for braking equipment. However, due to the high current and impact during braking, the motor is prone to overheating, or components of the transmission part may be damaged. Regenerative braking, also known as feedback braking, occurs when the motor speed exceeds the synchronous speed of the rotating magnetic field under the action of a heavy load (e.g., when a crane motor lowers a heavy load). At this time, induced current is generated in the rotor conductors, producing a torque in the opposite direction of rotation under the influence of the rotating magnetic field. However, since the motor speed is high, a speed-changing device is required for deceleration.

ELMOT SCHAFER motor classification

Based on the excitation of the mover, motors can be classified into conventional linear synchronous motors with DC-excited mover poles and permanent magnet linear synchronous motors with permanent magnet mover poles. In the former, the magnitude of the excitation magnetic field is determined by the magnitude of the DC current. By controlling the excitation current, the tangential traction force and lateral attraction force of the motor can be changed. This motor structure allows separate control of the motor's tangential and lateral forces. In permanent magnet linear synchronous motors, the pole magnetic field is provided by permanent magnets, and the mover poles do not require external power excitation, simplifying the motor structure and improving overall efficiency, but the pole magnetic field is not adjustable.

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