ELMOT-SCHAFER motor Germany ELMOT-SCHAFER model ELMOT-SCHAFER price

ELMOT-SCHAFER motors are AC motors that generate electromagnetic torque through the interaction between the rotating magnetic field in the air gap and the induced current in the rotor windings, thereby converting electrical energy into mechanical energy. Three-phase asynchronous motors are mainly used as motors to drive various production machinery, such as fans, pumps, compressors, machine tools, light industrial and mining machinery, threshers and crushers in agricultural production, and processing machinery for agricultural and sideline products, etc. They feature simple structure, ease of manufacturing, low cost, reliable operation, durability, high operating efficiency, and suitable operating characteristics.

ELMOT-SCHAFER motor starting

The resistance and inductance of the motor armature circuit are small, and the rotating body has a certain mechanical inertia. Therefore, when the motor is connected to the power supply, the armature speed and the corresponding back EMF are very small at the beginning of starting, resulting in a large starting current. The maximum can reach 15 to 20 times the rated current. This current will disturb the power grid, cause mechanical shock to the unit, and produce sparks at the commutator. Therefore, direct switching starting is only suitable for motors with a power not greater than 4 kilowatts (starting current is 6 to 8 times the rated current). To limit the starting current, a specially designed variable resistor is often connected in series in the armature circuit; its principle wiring is shown in Figure 1. During the starting process, as the speed continues to rise, each segment of the resistor is short-circuited step by step in time, keeping the starting current within a certain allowable value. This starting method is called series resistance starting. It is very simple, the equipment is lightweight, and it is widely used in various small and medium-sized DC motors. However, due to the large energy consumption during the starting process, it is not suitable for motors that start frequently or for medium and large DC motors. But for certain special needs, such as urban trams which start frequently, in order to simplify equipment, reduce weight, and facilitate operation and maintenance, the series resistance starting method is usually adopted. For DC motors with larger capacity, reduced voltage starting is usually adopted. That is, a separate adjustable DC power supply supplies power to the motor armature. Controlling the power supply voltage allows smooth motor starting and speed regulation. This method requires more complex power supply equipment.

ELMOT-SCHAFER motor control principle

Regarding the motor control principle, first the control unit must determine the sequence for turning on the power transistors in the inverter based on the position of the motor rotor sensed by the hall-sensor, according to the stator winding. This involves AH, BH, CH in the inverter (these are called upper arm power transistors) and AL, BL, CL (these are called lower arm power transistors), causing current to flow through the motor coils in sequence to generate a forward (or reverse) rotating magnetic field, which interacts with the rotor magnets, thus enabling the motor to rotate clockwise/counterclockwise. When the motor rotor rotates to a position where the hall-sensor senses another set of signals, the control unit turns on the next group of power transistors. In this cycle, the motor can continue to rotate in the same direction until the control unit decides to stop the rotor by turning off the power transistors; to reverse the rotor, the opening sequence of the power transistors is reversed. Basically, the opening method of power transistors can be exemplified as follows: AH and BL group → AH and CL group → BH and CL group → BH and AL group → CH and AL group → CH and BL group, but AH and AL or BH and BL or CH and CL must never be turned on simultaneously.

ELMOT-SCHAFER motor classification

Theoretically, if measures are taken to create a certain phase difference in the AC current flowing through the two windings of a single-phase motor, it can start. How to create a certain phase difference between magnetomotive forces or magnetic fluxes that are already offset by a certain angle in space is the starting point for solving the starting problem. Based on this, single-phase AC asynchronous motors can be divided into two major categories: split-phase and shaded-pole. Split-phase single-phase motors use capacitors or resistors connected in series with the inductive starting winding to achieve phase shifting, causing the current phase of the starting winding and the running winding to be offset, known as "split-phase". Capacitor split-phase single-phase motor principle wiring. Due to the obvious phase-shifting effect of the capacitor, connecting a capacitor of appropriate capacity (generally about 20 to 50μF) in series with the starting winding can make the current phase difference between the two windings close to 90°. At this time, the resultant rotating magnetic field is close to a circular rotating magnetic field, resulting in high starting torque and low starting current. This type of single-phase motor is widely used. After starting, the capacitor can be retained as needed (called capacitor-run motor) or disconnected (called capacitor-start motor, executed by a centrifugal switch inside the motor). If you need to change the direction of the motor, simply swap the output terminals of any one winding; at this time, the current phase relationship between the two windings is reversed. Resistance split-phase single-phase motors have fewer turns and thinner wires, resulting in lower reactance and higher resistance compared to the running winding. When using resistance split-phase starting, the starting winding current leads the running winding, and the resultant magnetic field is an elliptical rotating magnetic field with a large ellipticity. The starting torque is small, so it is only used for no-load or light-load occasions and is less commonly applied. The starting winding of a resistance split-phase single-phase motor is generally designed for short-term operation. After starting, it is disconnected by a centrifugal switch, and the running winding maintains operation. Figure (b) shows the principle wiring of a resistance split-phase single-phase motor.

Weidou Intelligent Technology professionally sells German ELMOT-SCHAFER motors, ELMOT-SCHAFER motors, ELMOT-SCHAFER drives, ELMOT-SCHAFER synchronous motors, ELMOT-SCHAFER servo motors, ELMOT-SCHAFER DC motors, ELMOT-SCHAFER AC motors, ELMOT-SCHAFER stepper motors, ELMOT-SCHAFER synchronous motors, ELMOT-SCHAFER asynchronous motors, ELMOT-SCHAFER single-phase motors, ELMOT-SCHAFER three-phase motors, ELMOT-SCHAFER drive motors, ELMOT-SCHAFER geared motors, ELMOT-SCHAFER electric motors, ELMOT-SCHAFER original imports from Germany. Welcome customers to inquire and order.