Micro Motors motor, German Micro Motors model, Micro Motors price

Micro Motors motors refer to motors with speeds 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. With low rotational inertia, high-speed motors offer advantages such as high power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

Micro Motors motor advantages

The motor consists of the motor body and the driver, representing a typical mechatronic product. The stator windings of the motor are mostly configured in a three-phase symmetrical star connection, very similar to three-phase asynchronous motors. Permanent magnets that have been magnetized are bonded to the rotor of the motor. To detect the polarity of the motor rotor, position sensors are installed inside the motor. The driver is composed of power electronic devices and integrated circuits. Its functions include: receiving start, stop, and brake signals from the motor to control starting, stopping, and braking; receiving signals from position sensors and forward/reverse rotation signals to control the switching of power transistors in the inverter bridge, generating continuous torque; receiving speed commands and speed feedback signals to control and adjust the speed; and providing protection and display functions.

Micro Motors motor structure

Motor rotor position sensors fall into three types: photoelectric, magnetic-sensitive, and electromagnetic. Brushless DC motors using photoelectric position sensors have photoelectric sensing devices arranged at specific positions on the stator assembly, with a light-blocking plate on the rotor and an LED or small bulb as the light source. As the rotor rotates, the light-blocking plate causes the photosensitive components on the stator to intermittently emit pulse signals at a certain frequency. Magnetic-sensitive position sensors are semiconductor sensitive elements whose output changes according to specific laws with the surrounding magnetic field; their basic principles are the Hall effect and magnetoresistive effect. The main working principle of magnetic-sensitive elements is the magnetic effect of current, primarily the Hall effect. In brushless DC motors using magnetic-sensitive position sensors, magnetic sensing devices (such as Hall elements, magnetic-sensitive diodes, magnetic-sensitive transistors, magnetic-sensitive resistors, or specialized integrated circuits) are mounted on the stator assembly to detect changes in the magnetic field generated by the permanent magnets as the rotor rotates. In brushless DC motors using electromagnetic position sensors, electromagnetic sensor components are installed on the stator assembly. When the position of the permanent magnet rotor changes, the electromagnetic effect causes the electromagnetic sensor to generate high-frequency modulated signals (with amplitude varying with rotor position). In recent years, sensorless brushless DC motors have emerged. These motors use the back electromotive force (EMF) of the stator windings as the position signal for the rotor magnets. After detection, this signal is processed by digital circuits and sent to logic switching circuits to control commutation. By eliminating position sensors, the structure of the brushless motor becomes more compact, leading to increasingly widespread application.

Micro Motors motor starting methods

Motor starting methods include direct starting and reduced-voltage starting. Reduced-voltage starting includes: autotransformer compensation starting, star-delta switching starting, and extended-delta starting. Generally, small and medium-sized squirrel-cage asynchronous motors can be started directly. Direct starting equipment is simple and the method is convenient. However, it results in high starting current and low starting torque. Large-capacity squirrel-cage asynchronous motors generally start by reducing the voltage at the terminals of the stator windings. During reduced-voltage starting, the starting current is reduced, but the starting torque is inevitably reduced as well. Various reduced-voltage starting methods are introduced below: Autotransformer compensation starting: Starting voltage = voltage drop factor × rated voltage; Starting current = voltage drop factor × starting current (direct); Starting torque = square of voltage drop factor × starting torque (direct). Characteristics of the starting method: The motor stator windings start via an autotransformer for voltage reduction, and the autotransformer is disconnected after starting. Pros and cons: 1 Low starting current, 2 Starting control equipment cannot handle frequent starts, 3 Equipment is relatively expensive, but the starting torque is larger than that of star-delta switching, so it is widely used. Star-delta switching starting: Starting voltage = 0.577 × rated voltage; Starting current = 1/3 × starting current (direct); Starting torque = 1/3 × starting torque (direct). Characteristics of the starting method: The motor stator windings are connected in star configuration during starting and switched to delta configuration after starting. Pros and cons: 1 Low starting current, 2 Low starting torque, 3 Allows frequent starting, 4 Low price, suitable for motors with delta-connected stator windings, generally used for light-load starting of small-capacity motors. Extended-delta starting: Starting voltage = 0.78 × rated voltage (depends on stator winding tap voltage); Starting current = 0.6 × starting current (direct); Starting torque = 0.6 × starting torque (direct). Characteristics of the starting method: The motor stator windings are connected in an extended-delta configuration during starting and switched to delta configuration after starting. Pros and cons: 1 Relatively low starting current, 2 Relatively high starting torque, 3 Allows frequent starting, 4 Only applicable to motors with intermediate taps on the stator windings. Secondly, soft starters and variable frequency drives (VFDs) are now widely used. They are easy to promote and control for small-capacity equipment. For large-capacity, high-voltage motors, they should be used with caution. Although the technology is mature, the presence of non-linear components in the circuit generates significant harmonic pollution to the power supply. Despite the availability of harmonic mitigation equipment, irregular waveforms still exist in low-voltage lines, affecting the normal operation of office electronic equipment and potentially causing capacitor breakdown in the circuit.

Weidou Intelligent Technology specializes in selling German Micro Motors motors, Micro Motors motors, Micro Motors drives, Micro Motors synchronous motors, Micro Motors servo motors, Micro Motors DC motors, Micro Motors AC motors, Micro Motors stepper motors, Micro Motors synchronous motors, Micro Motors asynchronous motors, Micro Motors single-phase motors, Micro Motors three-phase motors, Micro Motors drive motors, Micro Motors geared motors, Micro Motors electric motors, Micro Motors original imports from Germany. Welcome inquiries and orders from users.