BKD motor, German BKD model, BKD price

BKD motor refers to a low-power single-phase asynchronous motor powered by a single-phase AC supply (AC220V). This type of motor typically has two-phase windings on the stator and a standard squirrel-cage rotor. Different distributions of the two-phase windings on the stator and different power supply conditions can produce different starting and operating characteristics.

BKD motor working principle

Motor direct torque control method. This method analyzes the mathematical model of the AC motor in the stator coordinate system, emphasizing direct control of the motor torque under the condition of an approximately circular rotating magnetic field, eliminating complex calculations such as vector coordinate transformations. Its field orientation applies stator flux linkage, which can be observed by knowing only the stator resistance, making it less susceptible to changes in motor parameters compared to vector control. In recent years, direct torque control has been applied to the control of permanent magnet synchronous motors, and its control laws and key technologies are gradually being understood and mastered. Direct torque control has broad application prospects in fully digital, high-torque, fast-response AC servo systems. Nonlinear control: The AC motor is a strongly coupled, nonlinear, multivariable system. Nonlinear control achieves dynamic decoupling and global linearization of the system through nonlinear state feedback and nonlinear transformation, decomposing the nonlinear, multivariable, strongly coupled AC motor system into two independent linear single-variable systems. The rotor flux linkage subsystem consists of two inertial links. The regulation of the two subsystems is designed separately according to linear control theory to achieve the expected performance indicators. However, the basis for feedback linearization of nonlinear systems is a motor model with known parameters and precise measurement or observation of the system. During operation, motor parameters change due to various factors, and the accuracy of flux linkage observation is difficult to verify, all of which affect the robustness of the system and may even degrade system performance. Therefore, this control method still needs further improvement. Adaptive control can continuously extract information about the model during system operation, gradually improving the model, and is an effective means to overcome the influence of parameter changes. Adaptive methods applied to permanent magnet AC motor control include model reference adaptive control, parameter identification self-tuning control, and various newly developed nonlinear adaptive controls. However, all these methods have problems: (1) mathematical models and calculations are cumbersome, complicating the control system; (2) identification and correction require a process, so for systems with rapid parameter changes, it is difficult to achieve good results due to the inability to correct in time. Sliding mode variable structure control is a control strategy of variable structure control. Its fundamental difference from conventional control lies in the discontinuity of control, i.e., a switching characteristic that allows the system "structure" to change at any time. Its main feature is to purposefully make the system move along a designed "sliding mode" trajectory based on the deviation of the controlled variable and its derivative. This sliding mode can be designed and is independent of system parameters and disturbances, thus giving the system strong robustness. In addition, sliding mode variable structure control does not require any online identification, so it is easy to implement. Over the past 10 years, applying sliding mode variable structure control to AC drives has been a research hotspot for scholars domestically and internationally, and some effective results have been achieved. However, the inherent discontinuous switching characteristic of sliding mode variable structure control causes a "chattering" problem in the system. The main reasons are: (1) For actual sliding mode variable structure systems, the control force is always limited, resulting in limited system acceleration; (2) System inertia, time and space lag of switching switches, and errors in state detection, especially for computer sampling systems, form "quasi-sliding modes" when the sampling time is long. Therefore, "chattering" inevitably exists in actual systems and cannot be eliminated, which limits its application.

BKD motor mechanical characteristics

The motor has the following features: B class temperature rise design, F class insulation manufacturing. The use of polymer insulation materials and vacuum pressure impregnation manufacturing processes, as well as special insulation structures, significantly improves the insulation voltage resistance and mechanical strength of the electrical windings, sufficient to handle high-speed motor operation and resist high-frequency current impacts from inverters and voltage damage to insulation. High balancing quality, vibration level is R class (vibration reduction class). Mechanical parts are processed with high precision, and specialized high-precision bearings are used, allowing for high-speed operation. Forced ventilation cooling system uses imported axial flow fans, which are ultra-quiet, long-life, and provide strong airflow. This ensures effective heat dissipation at any speed, enabling long-term operation at high or low speeds. The YP series motors, designed using AMCAD software, have a wider speed regulation range and higher design quality compared to traditional variable frequency motors. Special magnetic field design further suppresses high-order harmonic magnetic fields to meet design indicators for wide frequency, energy saving, and low noise. It features wide-range constant torque and power speed regulation characteristics, smooth speed regulation, and no torque ripple. It has good parameter matching with various inverters. Combined with vector control, it can achieve zero-speed full torque, low-frequency high torque, high-precision speed control, position control, and fast dynamic response control. The YP series variable frequency dedicated motors can be equipped with brakes and encoders, enabling precise stopping and high-precision speed control through closed-loop speed control. Using "gearbox + variable frequency dedicated motor + encoder + inverter" achieves precise control of ultra-low stepless speed regulation. The YP series variable frequency dedicated motors have good universality, their installation dimensions comply with IEC standards, and they are interchangeable with general standard motors.

BKD motor speed regulation

The motor inverter is a low-voltage inverter. The input side uses a transformer to step down high voltage to low voltage, replacing the high-voltage motor with a special low-voltage motor. Motor voltage levels vary widely without a unified standard. This approach, using low-voltage inverters with relatively small capacity, generates significant harmonics on the grid side. 12 pulse rectification can be used to reduce harmonics, but it does not meet strict harmonic requirements. When the inverter fails, the motor cannot switch to grid frequency operation, causing issues in applications where downtime is not allowed. Additionally, both the motor and cables must be replaced, involving significant engineering work. Feeding part of the asynchronous motor's rotor energy back to the grid to change rotor slip for speed regulation uses thyristor technology and requires wound-rotor asynchronous motors. However, industrial sites now almost exclusively use squirrel-cage asynchronous motors, making motor replacement very troublesome. The speed regulation range of this method is generally around 70%-95%, which is narrow. Thyristor technology easily causes harmonic pollution to the grid; as speed decreases, the grid-side power factor also drops, requiring compensation measures. Its advantage is that the variable frequency part has smaller capacity, making it slightly lower in cost than other high-voltage AC variable frequency speed regulation technologies. A variation of this speed regulation method is the internal feedback speed regulation system, which eliminates the transformer in the inverter part by integrating the feedback winding directly into the stator winding. This approach requires motor replacement, and its performance in other aspects is similar to cascade speed regulation.

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