NEWS

In industrial power distribution and equipment selection, calculating the rated current of a high‑voltage motor is a fundamental yet crucial task. Many engineers new to high‑voltage systems may think it is complicated, but in fact its core principle is the same as that for low‑voltage motors – it all comes down to power, voltage, and power factor.

It can be stated boldly - and accurately - that the overall volume of a motor is determined by the torque it must produce: the larger the volume, the greater the torque. Of course, there may be exceptions to this rule, but as a general guideline for motor selection, it is very useful.

Since a reducer is a transmission device, many faults often occur during its operation due to external working conditions (e.g., bearing heavy loads) and internal factors.

Although Shanghai Motor (Shanghai Electric Machinery Factory Co., Ltd.) and Shangdian Motor (Shanghai Shangdian Electric Co., Ltd.) share similar names and a common origin, they have each evolved into distinct entities in terms of corporate nature, operational scale, product positioning, and market standing.

Low-voltage motors are subject to mandatory BSMI inspection and control, while high-voltage motors are not subject to this restriction. Currently, high-voltage motors have no mandatory energy efficiency regulations and do not require registration in any official system; they only need to comply with relevant specifications for high-voltage electrical equipment.

The core difference between the routine test (factory test) and the type test for high-voltage three-phase asynchronous motors is: The routine test is a "factory pass certificate" performed on every motor to verify the manufacturing quality of each unit. The type test is a "design validation report" performed on a sample from the same specification to verify the design and performance compliance of the entire series.