WEG motor Germany WEG model WEG price

WEG motor refers to a motor with a speed exceeding 10000r/min. Due to their high speed, their volume is much smaller than that of ordinary motors of the same power. Connected directly to the prime mover, they eliminate traditional reduction gears. Reasons such as the low moment of inertia of high-speed motors result in advantages including high motor power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

WEG motor control principle

Motor control principle: To make the motor rotate, the control unit must first determine the rotor position sensed by the hall-sensor, and then decide the sequence for turning on (or off) the power transistors in the inverter (inverter) based on the stator winding. This involves AH, BH, CH (known as upper-arm power transistors) and AL, BL, CL (known as lower-arm power transistors) in the inverter. This causes current to flow through the motor coils in sequence, generating a forward (or reverse) rotating magnetic field that interacts with the rotor magnets, thereby causing the motor to rotate clockwise or counter-clockwise. When the motor rotor rotates to a position where the hall-sensor senses another set of signals, the control unit turns on the next group of power transistors. In this cycle, the motor continues to rotate in the same direction until the control unit decides to stop the rotor by turning off the power transistors (or only turning on the lower-arm power transistors). To reverse the rotor, the power transistor switching sequence is reversed. Basically, the power transistor switching can be exemplified as follows: AH and BL as a group → AH and CL as a group → BH and CL as a group → BH and AL as a group → CH and AL as a group → CH and BL as a group. However, AH and AL, or BH and BL, or CH and CL must never be turned on simultaneously. Furthermore, since electronic components always have switching response times, the response time must be considered during the interleaved switching of power transistors. Otherwise, if the lower arm (or upper arm) turns on before the upper arm (or lower arm) has completely turned off, it will cause a short circuit between the upper and lower arms, burning out the power transistors.

WEG motor speed measurement method

A motor converts pulse signals into angular or linear displacement. First, it has good overload capacity. Its speed is not affected by the load size; unlike ordinary motors, which experience a drop in speed when the load increases, stepper motors have strict requirements for speed and position during use. Second, control is convenient. Stepper motors rotate in "steps," making their digital characteristics quite apparent. Third, the overall machine structure is simple. Traditional mechanical speed and position control structures are complex and difficult to adjust. Using stepper motors simplifies and compacts the overall machine structure. A tachometer generator converts rotational speed into voltage and transmits it to the input terminal as a feedback signal. A tachometer generator is an auxiliary motor. Installed at the tail end of a standard DC motor, it feeds back the voltage generated by the tachometer generator to the DC power supply to control the DC motor speed.

WEG motor structure

The motor body is similar to a Permanent Magnet Synchronous Motor (PMSM). The rotor uses permanent magnets, often rare-earth permanent magnet materials, but lacks cage windings and other starting devices. The stator windings use AC windings, generally supporting multi-phase (three-phase, four-phase, or five-phase). The rotor consists of permanent magnet steel arranged with a specific number of pole pairs (2P=2,4,6…). The design requires obtaining a trapezoidal wave with a top width of 120° in the stator windings. Therefore, the windings often adopt full-pitch, concentrated, or near full-pitch, concentrated forms to retain other harmonics in the magnetic flux density. Brushed DC motors rely on mechanical commutators to convert DC current into approximately trapezoidal AC current supplied to the armature windings. In contrast, Brushless DC Motors (BLDCM) rely on electronic commutators to input square wave currents sequentially into each phase of the stator armature windings according to a specific phase sequence. When a certain phase of the BLDCM stator winding is energized, the magnetic field generated by that phase's current interacts with the magnetic field produced by the rotor's permanent magnets to generate torque, driving the rotor to rotate. Position sensors convert the rotor magnet position into electrical signals to control the electronic switching circuit, thereby conducting the stator windings in a specific order. This ensures that the stator phase current commutes in the correct sequence as the rotor position changes. This allows the electronic magnetic field to change continuously with the rotor's rotation, generating a rotating magnetic field synchronous with the rotor speed, and keeping the spatial angle between the stator magnetic field and the rotor magnetic field at approximately 90°, pushing the rotor to rotate with maximum torque. Since the conduction sequence of the electronic switching circuit is synchronous with the rotor angle, it performs the commutation function of a mechanical commutator, ensuring that the stator and rotor magnetic fields remain basically perpendicular during operation to improve efficiency. Therefore, in terms of basic structure, a BLDCM can be considered a "self-synchronous motor system" composed of electronic switch-commutated current, a permanent magnet synchronous motor, and position sensors. It does not lose synchronism during operation. The rotor structure of Permanent Magnet Brushless Motors (BLDCM) includes both traditional inner rotor structures and new structural forms such as disc-type, outer rotor, and linear structures.

Weidou Intelligent Technology specializes in selling German WEG motors, WEG motors, WEG drives, WEG synchronous motors, WEG servo motors, WEG DC motors, WEG AC motors, WEG stepper motors, WEG synchronous motors, WEG asynchronous motors, WEG single-phase motors, WEG three-phase motors, WEG drive motors, WEG geared motors, WEG electric motors. WEG original imports from Germany. Welcome customers to inquire and order.