EMK-Motor motor Germany EMK-Motor model EMK-Motor price

EMK-Motor motor refers to a motor that can operate on both DC and AC power supplies. This type of electric motor is widely used in daily household appliances, manual devices, computing tools, and precision machinery. In addition, this type of motor is frequently used in medical equipment, communication technology, measurement technology, the film industry, and many other fields.

EMK-Motor motor applications

The motor stator generates a stationary magnetic field. This stationary magnetic field surrounds the armature (or rotor). An external power supply excites the armature magnetic field. On the shaft of a DC brushed motor, there are two arc-shaped copper segments called commutator segments. When the motor rotates, carbon brushes slide on the commutator. This generates a rotating magnetic field that is attracted to the stationary magnetic field of the stator. The current in the armature and stator windings is supplied by batteries or other DC power sources (permanent magnet DC brushed motors do not have stator windings). The battery (or DC power supply) provides a constant DC voltage. The voltage amplitude determines the motor speed, so the battery or DC power supply is a linear excitation source. The most effective way to change the speed of a DC brushed motor is to use pulse width modulation (pwm) technology. pwm technology switches a constant voltage source at a fixed frequency. Changing the pulse width of the pwm signal adjusts the motor speed. The ratio between the high and low levels of the pulse is called the duty cycle of the pwm signal. The amplitude of the DC battery level is equal to the average amplitude of the pwm signal. DC brushed motors have good starting and speed regulation performance and are often used in applications with high requirements for starting and speed control, such as large reversible rolling mills, mine hoists, high-speed hotel elevators, gantry planers, electric locomotives, internal combustion locomotives, city trams, subway trains, electric bicycles, papermaking and printing machinery, marine machinery, large precision machine tools, and large cranes.

EMK-Motor motor structure

The electronic commutation circuit of the motor consists of two main parts: the power conversion circuit and the control circuit. Working together with position sensors, it controls the energization sequence and timing of each phase winding of the motor stator, performing a function similar to mechanical commutation. During system operation, the power converter accepts control information from the control circuit and distributes the power from the system's working power supply to each phase winding on the stator of the brushless DC motor according to a certain logical relationship, so that the motor produces continuous torque. The inverter converts DC current into AC current to supply the motor. Unlike general inverters, its output frequency is not independently adjusted but is controlled by the rotor position signal, making it a "self-controlled inverter." Permanent magnet brushless motor BLDCM: Due to the use of a self-controlled inverter, the frequency of the motor input current always remains synchronized with the motor speed, preventing oscillation and loss of synchronism between the motor and the inverter. This is one of the significant advantages of permanent magnet brushless motors BLDCM. For electric vehicle motors, the energization sequence and timing of each motor winding mainly depend on signals from position sensors. However, the signals generated by the position sensors generally cannot be used directly to drive the power switching elements of the power converter; they often require logical processing and isolation through the control circuit before they can drive the switching elements of the power converter. The role of the driver box circuit is to process the rotor position signals detected by the position sensors and output them according to a certain logic code to trigger the power switch transistors.

EMK-Motor motor control methods

Motor Direct Torque Control technology: Direct Torque Control (Direct Self-Control, DSC) constructs flux linkage and electromagnetic torque models on the stationary stator coordinate system and achieves control of electromagnetic torque and stator flux linkage by applying different voltage vectors. The Direct Torque Control method has advantages such as simple algorithms and good torque response, so it is widely used in applications requiring high transient torque response. Due to inherent disadvantages in control, the Direct Torque Control method has a low control frequency and large torque ripple at low speeds. Therefore, reducing torque ripple at low speeds has become a research hotspot in Direct Torque Control methods. Sun Xiaohui and others achieved good results by optimizing the action time of voltage vectors to reduce torque ripple at low speeds. D.casadei and others applied the Direct Torque Control method to the control of AC induction motors based on discrete space vector modulation technology, reducing torque ripple.

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