ASTRO motor Germany ASTRO model ASTRO price

ASTRO motors refer to motors with speeds exceeding 10000r/min. Due to their high speed, their volume is far 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.

ASTRO motor mechanical characteristics

Motor characteristics: With the rapid development of power electronics and new semiconductor devices, AC speed control technology has been continuously improved. Gradually perfected variable frequency drives (VFDs) are widely used in AC motors due to their good output waveforms and excellent performance-to-price ratio. 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 handling 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 regulation and energy saving. (2) Simple structure, small size, low inertia, low cost, easy maintenance, and durability of AC motors. (3) Capability to expand capacity and achieve high-speed and high-voltage operation. (4) Ability to implement soft start and rapid braking. (5) Spark-free, explosion-proof, and strong environmental adaptability. In recent years, international variable frequency drive devices have developed at an annual growth rate of 13 %～ 16%, showing a trend of gradually replacing most DC speed control drive devices. 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 according to usage scenarios 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.

ASTRO motor applications

Static indicator terminology for motors: Number of phases: The number of pairs of excitation coils that generate different pole pair N and S magnetic fields. Commonly denoted by m. Step count (Beat number): The number of pulses or conductive states required to complete one periodic change of the magnetic field, denoted by n, or refers to the number of pulses required for the motor to rotate through one tooth pitch angle. Taking a four-phase motor as an example, the four-phase four-beat operation mode is AB-BC-CD-DA-AB, and the four-phase eight-beat operation mode is A-AB-B-BC-C-CD-D-DA-A. Step angle: The angular displacement of the motor rotor corresponding to one pulse signal, denoted by θ. θ=360 degrees (rotor teeth J * operating beats). Taking conventional two-phase and four-phase motors with 50 rotor teeth as an example: In four-beat operation, the step angle is θ=360 degrees/(50*4) =1.8 degrees (commonly known as full step); in eight-beat operation, the step angle is θ=360 degrees/(50*8) =0.9 degrees (commonly known as half step). Detent torque: The locking torque of the motor rotor itself when the motor is not energized (caused by harmonics of the magnetic field tooth shape and mechanical errors). Static torque: The locking torque of the motor shaft when the motor does not rotate under rated static electrical excitation. This torque is a standard for measuring motor volume (geometric dimensions) and is independent of drive voltage and drive power supply. Although static torque is proportional to the electromagnetic excitation ampere-turns and related to the air gap between the stator teeth and the rotor, excessively reducing the air gap and increasing excitation ampere-turns to improve static torque is inadvisable, as this will cause motor heating and mechanical noise.

ASTRO motor phase angle and torque

The motor phase difference angle (torque angle) is the phase difference δ between the no-load induced electromotive force generated by the magnetic field and the armature voltage. The torque of a synchronous motor is proportional to sin(δ) and reaches the theoretical xxx torque at δ= 90 degrees (for cylindrical motors; it differs for salient-pole motors). Furthermore, since the motor rotates synchronously with the frequency of the armature voltage, the output is proportional to the torque. If the load torque is too large, the motor stops due to "out-of-step (loss of synchronism)." The torque at this point is called the "pull-out torque," and it serves as the phase difference angle within the range of 50-70 degrees.

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