ELAU motor Germany ELAU model ELAU price

ELAU motor is an AC motor that generates 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, processing machinery for agricultural and sideline products, etc. Simple structure, easy manufacturing, low price, reliable operation, robust and durable, high operating efficiency and suitable working characteristics.

ELAU motor fault analysis

For an engine to start normally, three elements are required: compression, spark, and air-fuel mixture. If any of these elements functions abnormally, it will cause the engine to fail to start or experience difficult starting. There are many factors leading to starting faults in electronic fuel injection engines; the faults analyzed below occur under conditions where the battery voltage is normal, the starting system is functioning properly, the engine has good compression and spark, and the exhaust purification device is working normally. Starting faults generally manifest as failure to start and difficult starting, with difficult starting further divided into cold start difficulty and hot start difficulty.

ELAU motor control principle

When the motor rotates, the control unit compares the speed of hall-sensor signal changes with the command composed of the speed and acceleration/deceleration rates set by the driver (or calculated by software) to determine which next group of switches (AH, BL or AH, CL or BH, CL or ...) conducts and for how long. If the speed is insufficient, the conduction time is lengthened; if the speed is excessive, it is shortened. This part of the work is completed by PWM. PWM is the method for determining whether the motor speed is fast or slow; how to generate such PWM is the core of achieving precise speed control. High-speed control must consider whether the system's CLOCK resolution is sufficient to handle the timing of software instructions. Additionally, the data access method for hall-sensor signal changes affects processor performance, judgment accuracy, and real-time capability. For low-speed control, especially low-speed starting, since the returned hall-sensor signal changes more slowly, the signal acquisition method, processing timing, and appropriate configuration of control parameter values based on motor characteristics become very important. Alternatively, speed feedback can be referenced to encoder changes to increase signal resolution for better control. Smooth motor operation and good response also depend on proper P.I.D control. As previously mentioned, brushless DC motors use closed-loop control, so the feedback signal indicates to the control unit the difference between the actual motor speed and the target speed, which is the error.

ELAU motor working principle

The motor control system mainly consists of a permanent magnet brushless DC motor, DC voltage source, inverter, position sensor, and controller, adopting a "three-phase six-step - 120° square wave" drive. The permanent magnet brushless DC motor operates by turning on and off the inverter power transistors according to a specific pattern, generating a magnetic potential in the motor stator armature that advances continuously by 60° electrical degrees, thereby driving the motor rotor to rotate. Under ideal conditions, the back EMF and current of each phase of the armature involve each power transistor conducting for 120° electrical degrees, with a phase difference of 60° electrical degrees. When power transistors V3 and V4 conduct, the motor's V and -U (current flowing into the winding direction is positive) are connected. The resultant stator armature magnetic potential is Fa5 as shown in Figure 1; if power transistor V3 turns off and power transistor V5 turns on, the motor's W phase and -U are energized, the resultant armature magnetic potential becomes Fa5, and Fa5 has advanced clockwise by 60° electrical degrees compared to Fa4. Thus, the magnetic potential generated by the stator armature rotates continuously clockwise by 60° electrical degrees as the power transistors turn on and off in a regular pattern. There are six commutation combination states for the inverter power transistors; each state must correspond to a specific rotor position or back EMF waveform to produce the maximum average electromagnetic torque. The interaction force is greatest when the angle between the two magnetic potential vectors is 90°. Since the magnetic potential generated by the electronic armature advances by 60° electrical degrees, the angle between the rotor magnetic potential and the stator magnetic potential must vary within the range of 60° to 120° in each commutation mode to produce the maximum average electromagnetic torque. As shown in Figure 1, suppose at time t1, the rotor's Fj is within the plane of coils U and X, causing the rotor to rotate clockwise. At this point, power transistors V5 and V4 should be turned on, making the angle between the stator's resultant magnetic potential Fa5 and Fj equal to 120°. The rotor rotates clockwise under the electromagnetic torque generated by the interaction between Fa5 and Fj. At time t3, the angle between Fa5 and Fj becomes 60°. At this point, power transistor V4 is turned off, and power transistor V6 is turned on. The stator's resultant magnetic potential is Fa6, forming an angle of 120° with Fj, and the electromagnetic torque generated by both causes the rotor to rotate further. Regarding scalar control based on steady-state models, the initial operating mode of AC motors was uncontrolled operation. Its control functions were limited to switching on and off, and in some cases, auxiliary starting, braking, and reversing. To meet some variable speed drive requirements, controls with poorer performance emerged, such as voltage reduction speed control for squirrel-cage asynchronous motors, rotor resistance series speed control for wound-rotor asynchronous motors and electromagnetic slip clutch speed control, cascade speed control for wound-rotor asynchronous motors, variable voltage variable frequency speed control for squirrel-cage asynchronous motors (VVVF), pole-changing speed control, and variable voltage variable frequency speed control for synchronous motors. Among the above speed control methods, except for variable voltage variable frequency speed control, most are open-loop controls that do not require inverters, featuring simple equipment but low efficiency and poor performance. Slip frequency closed-loop control for squirrel-cage asynchronous motors based on constant V/f control offers relatively better performance. However, since they are all based on steady-state models, their dynamic performance is poor, and they are generally only used for energy-saving speed control and general speed control applications with low dynamic performance requirements, such as water pumps and fans. Vector control theory deepens AC motor control from external macroscopic steady-state control to transient control of the internal electromagnetic processes of the motor. This has led to a qualitative leap in the control performance of permanent magnet synchronous motors. The most essential feature of vector control is transforming the complex, coupled, nonlinear variables inside the AC motor into DC variables (such as current, flux linkage, voltage, etc.) in a stationary reference frame through coordinate transformation, identifying constraints, and obtaining the optimal control strategy for a specific objective.

Weidou Intelligent Technology specializes in selling German ELAU motors, ELAU motors, ELAU drives, ELAU synchronous motors, ELAU servo motors, ELAU DC motors, ELAU AC motors, ELAU stepper motors, ELAU synchronous motors, ELAU asynchronous motors, ELAU single-phase motors, ELAU three-phase motors, ELAU drive motors, ELAU geared motors, ELAU electric motors, ELAU original imports from Germany. Welcome customers to inquire and order.