Nuances of power and insulation facts, requirement and issues from THE thriving small-motor experts ‘in the know’…..

Shengzhou Liming Motor Co. Ltd is located in “Motor Township”- Shengzhou Economic Development Zone, Zhejiang Province, China. The company – a recent IMD online member – researches, develops and markets a range of highly effective small motors for multiple use.


The business has a small motor product range of 36 series and more than 460 varieties of quality effective motors all well-designed ad set for widely different uses. High-quality materials and unique technology have propelled  this business firmly to the forefront of the small motor production industry.  All its products have passed the CCC certification of China Quality Certification as well as the important European CE certification.


The Shengzhou Liming Motor Co. Ltd  has an experienced R & D team and a strong technical force, which enables the company  to produce and develop exceptional customised motors for very specific customer demand. In recent years, the business introduced to its works range of additional equipment in order to enhance the range and quality of its ever increasing, in-demand, small motor products.  

advanced testing 

Every process in production is backed by advanced testing by the company’s  technical experts. Here below these technical experts at the business explain and highlight guidance on two key small-motor issues – the difference between the rated and actual power and those key insulation elements pertaining to the business’ range of motors … 

Rated and Actual Power  – understanding the difference 

The difference between the rated power and the actual power of the motor means that the motor is in the best working condition under this data. The rated voltage is fixed and the allowable deviation is 10%. The actual power and actual current vary with the size of the load being dragged; If the load to be dragged is large, the actual power and actual current are large; if the load to be dragged is small, the actual power and actual current are small.

The rated power of the motor is not equal to the load power. Because when selecting the motor capacity, the future aging of the machine being dragged must be considered, so a margin must be added to the mechanical load power. The power level of the motor is not exactly equal to the calculated power of the machine, but the power level of the motor must be increased up, so the power of the motor is generally greater than that of the driven machine.

If the actual power and actual current are greater than the rated power and the rated current, the motor will be overheated and burned; The actual power and the actual current are less than the rated power and the rated current, which will cause material waste.

Their relationship is:- Rated power = rated current IN * rated voltage UN * root 3 * power factor. Actual power = actual current IN * actual voltage UN * root 3 * power factor

Insulation ‘facts and figures’ reference Shengzhou Liming small motors 

The insulation elements reference the company’s motor products includes the inter-strand, inter-turn, row, inter-layer and ground insulation of the coils, and various end supports or fixings of various insulation members and connection and lead insulation. 

The main insulation of a coil refers to the insulation between the coil and the body and other windings. It is also commonly called insulation to ground.

Interturn insulation refers to the insulation between turns of the same coil. Inter-strand insulation refers to the insulation between strands within the same turn, and is generally the insulation of the winding wire itself. The insulation of the motor is an important factor that determines the service life of the motor, so the insulation materials must be properly selected and placed. 

Asynchronous motor stator winding insulation is divided into slot insulation and phase insulation (interlayer insulation is not needed here). Slot insulation is used in the slot, which is the insulation between the winding and the iron core. 

Phase insulation, also called end insulation, is used for insulation between two windings at the end of the winding. Interlayer insulation is used for insulation between the upper and lower layers of the double-layer winding. The insulation material is the main insulation material selected according to the insulation level and voltage level of the motor, and is equipped with appropriate reinforcement materials to protect the main insulation material from mechanical damage. 

insulation materials 

Commonly used reinforcement materials are green shell paper, and the main insulation materials are polyester film and varnished cloth. When selecting insulation materials, the main insulation materials on lead wires, bushings, binding wires, dipping varnishes, etc. should be of the same insulation level and used together with each other.