B&R motor, German B&R model, B&R price

B&R motor refers to an electromagnetic device that converts or transfers electrical energy based on the law of electromagnetic induction. It broadly refers to all machines capable of converting mechanical energy into electrical energy and electrical energy into mechanical energy. The motor enclosure protection rating is IP44, and the cooling method is IC0141 totally enclosed self-fan cooled. The ambient air temperature varies with the seasons but does not exceed —15℃ to 40℃. The altitude does not exceed 1000m. Refer to the nameplate for rated frequency, rated voltage, insulation class, and duty cycle. When the supply voltage varies within ±0.05 of the rated value (frequency is the rated value), the motor output power maintains the rated value.

B&R motor structure

The motor armature core is the main part of the main magnetic circuit and is used to house the armature winding. Generally, the armature core is made by stacking laminations punched from silicon steel sheets 0.5mm thick to reduce eddy current losses and hysteresis losses generated in the armature core during motor operation. The stacked core is fixed to the shaft or rotor bracket. Armature slots are machined on the outer circumference of the core, and the armature winding is embedded in the slots. The function of the armature winding is to generate electromagnetic torque and induced electromotive force; it is the key component for energy conversion in DC motors, hence the name armature. It consists of many coils (hereinafter referred to as elements) connected according to a specific pattern. The coils are wound using high-strength enamel-covered wire or glass-silk-covered flat copper wire. The coil sides of different coils are embedded in the armature slots in two layers, upper and lower. Proper insulation must be provided between the coils and the core, as well as between the upper and lower layers of coil sides. To prevent centrifugal force from throwing the coil sides out of the slots, the slot openings are secured with slot wedges. The end connections of the coils extending outside the slots are bound with thermosetting non-woven glass tape. In DC motors, the commutator, paired with brushes, converts the external DC power supply into alternating current in the armature coils, keeping the direction of the electromagnetic torque constant. In DC generators, the commutator, paired with brushes, converts the alternating electromotive force induced in the armature coils into direct electromotive force drawn from the positive and negative brushes. The commutator is a cylinder composed of many commutator segments insulated from each other by mica sheets. The shaft supports the rotation of the rotor and requires sufficient mechanical strength and rigidity; it is generally machined from round steel.

B&R motor mechanical characteristics

Motor characteristics: With the rapid development of power electronics and new semiconductor devices, AC speed control technology has been continuously improved. Variable frequency drives (VFDs), with their good output waveforms and excellent performance-to-price ratio, have been widely applied to AC motors. Large motors for rolling mills in steel plants, medium and small roller table motors, traction motors for railways and urban rail transit, elevator motors, hoisting motors for container lifting equipment, motors for water pumps and fans, compressors, and household appliance motors have successively adopted AC variable frequency speed control motors, achieving good results. AC variable frequency speed control motors have significant advantages over DC speed control motors: (1) Easy speed control and energy saving. (2) AC motors have a simple structure, small size, low inertia, low cost, easy maintenance, and durability. (3) Capacity can be expanded to achieve high-speed and high-voltage operation. (4) Soft start and rapid braking can be achieved. (5) Spark-free, explosion-proof, and strong environmental adaptability. In recent years, international variable frequency speed control drives have developed at an annual growth rate of 13 % to 16 %, showing a trend of gradually replacing most DC speed control drives. Since ordinary asynchronous motors designed for constant frequency and constant voltage power sources have significant limitations when applied to variable frequency speed control systems, specialized variable frequency AC motors designed for specific applications and requirements have been developed abroad. Examples include motors for low noise and low vibration, motors with improved low-speed torque characteristics, high-speed motors, motors with tachogenerators, and vector control motors.

B&R motor structure

The electronic commutation circuit of the motor consists of two main parts: the power conversion circuit and the control circuit. Working in conjunction 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, enabling the motor to generate 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 motors BLDCM, due to the use of self-controlled inverters, maintain synchronization between the input current frequency and 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 winding primarily depend on signals from position sensors. However, the signals generated by the position sensors generally cannot directly drive the power switching elements of the power converter; they often require logical processing and isolation via the control circuit before driving the switching elements of the power converter. The function of the driver box circuit is to process the rotor position signals detected by the position sensors and output them according to a specific logic code to trigger the power switching transistors.

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