Elektromotorenwerk Brienz AG motors Germany Elektromotorenwerk Brienz AG models Elektromotorenwerk Brienz AG prices

Elektromotorenwerk Brienz AG motors are single-phase AC commutator motors, suitable for single-phase power supply applications requiring speed adjustment and reversal of rotation direction. The stator winding is powered by a single-phase source, and the rotor is an armature winding with a commutator short-circuited via brushes. The brushes can be moved to any position relative to the stator winding as needed. By shifting this position, the rotor's direction of rotation, mechanical characteristics, and operating speed can be changed. When the brushes deviate counterclockwise from the geometric neutral axis, the rotor rotates clockwise; when the brushes deviate clockwise from the geometric neutral axis, the rotor rotates counterclockwise.

Elektromotorenwerk Brienz AG motor classification

A machine that converts mechanical energy into direct current electrical energy. It mainly serves as a DC motor or provides the DC power required for electrolysis, electroplating, electric smelting, charging, and excitation power for AC generators. Although power rectifier components are used to convert AC to DC in places where DC is needed, AC rectified power supplies cannot completely replace DC generators in terms of certain performance characteristics. A rotating device that converts DC electrical energy into mechanical energy. The motor stator provides the magnetic field, the DC power supply provides current to the rotor windings, and the commutator keeps the direction of the torque produced by the rotor current and magnetic field unchanged. Depending on whether they are equipped with common brush-commutator assemblies, DC motors can be divided into two categories: brushed DC motors and brushless DC motors. Brushless DC motors are a new type of DC motor that has developed in recent years with the advancement of microprocessor technology, the application of new power electronic devices with high switching frequencies and low power consumption, the optimization of control methods, and the emergence of low-cost, high-energy-level permanent magnet materials. Brushless DC motors not only maintain the good speed regulation performance of traditional DC motors but also offer advantages such as no sliding contact or commutation sparks, high reliability, long service life, and low noise. Therefore, they have been widely applied in aerospace, CNC machine tools, robots, electric vehicles, computer peripheral equipment, and household appliances. According to different power supply methods, brushless DC motors can be further divided into two types: square-wave brushless DC motors, whose back EMF waveform and supply current waveform are both rectangular waves, also known as rectangular wave permanent magnet synchronous motors; and sine-wave brushless DC motors, whose back EMF waveform and supply current waveform are both sine waves.

Elektromotorenwerk Brienz AG motor working principle

The motor stator winding is powered by a single-phase supply, and the rotor consists of an armature winding with a commutator that is short-circuited via brushes. The brushes can be moved to any required position relative to the stator winding. By shifting this position, the direction of rotation, mechanical characteristics, and operating speed of the rotor can be changed. When the brushes are displaced counterclockwise from the geometric neutral axis, the rotor rotates clockwise; when the brushes are displaced clockwise from the geometric neutral axis, the rotor rotates counterclockwise. Due to this phenomenon where the direction of rotation is opposite to the direction of brush displacement, it is called a repulsion motor. It has mechanical characteristics similar to those of a series-wound DC motor and is used to drive mechanical loads requiring high starting torque. It is suitable for applications with single-phase power supply that require speed adjustment and reversal of rotation direction. Some motors are equipped with overload protection devices to protect the motor from burnout due to excessive current during overload. This component, made of bimetal, expands when heated, causing the contacts to open and cut off the circuit. When the overload is removed and the motor cools down, the contacts close again. The rotor coils are connected to the commutator and are not connected to the external circuit. The short-circuited brushes press against the commutator, positioned at an angle to the central axis of the stator magnetic field. When energized, the stator magnetic field induces an armature magnetic field in the armature. The poles of this magnetic field are located near the brushes. At this location, the polarity of the armature magnetic field is the same as that of the adjacent stator pole, generating mutual repulsive force between them and causing the armature to rotate.

Elektromotorenwerk Brienz AG motor structure

Motor control structure: A brushless DC motor is a type of synchronous motor, meaning the rotor speed is influenced by the speed of the stator's rotating magnetic field and the number of rotor poles (P), N=120．f / P. With a fixed number of rotor poles, changing the frequency of the stator's rotating magnetic field changes the rotor speed. A brushless DC motor adds electronic control (driver) to a synchronous motor, controlling the frequency of the stator's rotating magnetic field and feeding back the rotor speed to the control center for repeated correction, aiming to achieve characteristics close to those of a DC motor. In other words, a brushless DC motor can maintain a constant rotor speed within the rated load range even when the load changes. A brushless DC driver includes a power section and a control section: the power section provides three-phase power to the motor, while the control section converts the input power frequency as needed. The power section can accept direct DC input (typically 24V) or AC input (110V/220 V); if the input is AC, it must first be converted to DC by a converter (converter). Whether the input is DC or AC, before entering the motor coils, the DC voltage must be converted by an inverter (inverter) into 3-phase voltage to drive the motor. The inverter (inverter) generally consists of 6 power transistors (Q1～Q6) divided into upper arms (Q1, Q3, Q5) and lower arms (Q2, Q4, Q6) connected to the motor to act as switches controlling the current flowing through the motor coils. The control section provides PWM (Pulse Width Modulation) to determine the switching frequency of the power transistors and the commutation timing of the inverter (inverter). Brushless DC motors are generally intended for speed control applications where the speed remains stable at the set value with minimal variation when the load changes. Therefore, the motor interior is equipped with hall-sensors (hall-sensor) capable of sensing the magnetic field, serving as closed-loop speed control and also as the basis for phase sequence control. However, this is used only for speed control and cannot be used for position control.

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