BST motor Germany BST model BST price

The BST motor is equipped with a set of adjustable eccentric weights at each end of the rotor shaft, utilizing the centrifugal force generated by the high-speed rotation of the shaft and eccentric weights to obtain excitation force. Vibration motors have a wide vibration frequency range; only when the excitation force and power are properly matched can mechanical noise be reduced. Vibration motors are classified into six categories, such as by starting and operating mode, and by operating speed.

BST motor structure

The motor mainly consists of components such as the rotor, end covers, and stator. The stator structure of a permanent magnet synchronous motor is very similar to that of a conventional induction motor. The main difference in the rotor structure compared to an asynchronous motor is that high-quality permanent magnet poles are placed on the rotor. Depending on the position of the permanent magnets on the rotor, permanent magnet synchronous motors are usually divided into surface-mounted rotor structures and interior rotor structures. The placement of the permanent magnets has a significant impact on motor performance. Surface-mounted rotor structure: The permanent magnets are located on the outer surface of the rotor core. This rotor structure is simple, but it generates very little asynchronous torque, making it suitable only for applications with low starting requirements, and thus it is rarely used. Interior rotor structure: The permanent magnets are located within the core between the squirrel-cage bars and the shaft. It offers good starting performance, and the vast majority of permanent magnet synchronous motors adopt this structure.

BST motor working principle

A DC motor is an electric motor that converts direct current electrical energy into mechanical energy. Due to its excellent speed regulation performance, it is widely used in electric drives. DC motors are classified into 3 types based on the excitation method: permanent magnet, separately excited, and self-excited. Among these, self-excited motors are further divided into 3 types: shunt-wound, series-wound, and compound-wound. When the DC power supply supplies current to the armature winding through the brushes, conductors under the N pole on the armature surface carry current in the same direction. According to the left-hand rule, the conductors are subjected to a counter-clockwise torque; similarly, part of the conductors under the S pole on the armature surface also carry current in the same direction, and according to the left-hand rule, they are also subjected to a counter-clockwise torque. Thus, the entire armature winding, i.e., the rotor, rotates counter-clockwise, converting the input DC electrical energy into mechanical energy output on the rotor shaft. It consists of a stator and a rotor. Stator: base, main poles, commutating poles, brush assembly, etc. Rotor (armature): armature core, armature winding, commutator, shaft, fan, etc.

BST motor working principle

Direct torque control method for motors. This method analyzes the mathematical model of AC motors in the stator coordinate system, emphasizing direct control of motor torque under the condition of an approximately circular rotating magnetic field, thereby eliminating complex calculations such as vector coordinate transformations. Its field orientation uses 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: An 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 transformations, 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 elements. 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 cause performance degradation. 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 the following problems: (1) complex mathematical models and cumbersome calculations complicate the control system; (2) identification and correction require a process, so for systems with rapid parameter changes, it is difficult to achieve good results because correction cannot be performed 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 causes 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-space lag of switching switches, and errors in state detection, especially for computer sampling systems, form a "quasi-sliding mode" when the sampling time is long. Therefore, "chattering" inevitably exists and cannot be eliminated in actual systems, which limits its application.

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