Key Indicators for Judging the Quality of Motors

The production of the motor includes the following physical parts: magnetic steel, iron core, coil, base, Hall, insulating paint, and phase line.
There are five indicators for magnets: number, height, thickness, width and quantity. The number reflects the magnetic flux per unit volume, which is the level of the magnet. The higher, thicker, wider and more magnets are, the larger the volume of the magnet, the greater the force, and the greater the power consumption.
Coil, copper purity (brass or copper, as long as it is not copper-clad aluminum), number of turns, thickness, full slot rate, these are the main parameters. Hall, electronic components, Honeywell brand is better on the market. Insulation paint, the higher the temperature resistance, the better. Phase line, the thicker the better, generally 1 square can meet 10A current limit, for example, if the control current limit is 20A, the phase line must be more than 2 square.

Power - a point in the motor's specifications. For example, the original motor is 48V 500W, and the speed is 36 km/h. Then it is over-voltaged to 72V and the speed can reach 54 km/h. Divide the motor's speed by the voltage, and the result is more accurate. For example, the current speed is 45 km/h. If the voltage is 72V, the motor's speed per volt is 0.625. Another motor has a speed of 40 km/h, but the voltage is 48V. The speed of this motor per volt is 0.83333.
Efficiency (power saving)----Electric vehicle motors are just like that. The motors we are using generally have an efficiency of around 82%. If they are regular products, the difference is only around 2%. You say your motor is very good and uses the most advanced technologies such as high-temperature superconducting technology, so the difference can only be increased by 3 percentage points at most. However, the difference should not be too obvious.
 

Another important indicator - optimal efficiency point

The so-called optimal efficiency point refers to the point of optimal efficiency. In the motor industry, the optimal efficiency point refers to the power at the optimal efficiency point within the rated voltage and rated power range. For example, a 48V1000W motor is powered on at 48V for dynamometer. When the dynamometer chart comes out, you look at the lines around 1000W. If you see a highest efficiency value of 82.5%, and the corresponding power is 960W, and the corresponding efficiency value at the 1000W power point is only 81%, this means that the optimal efficiency point of this motor is 960W.

The best efficiency points are around the rated power point, with a difference of less than 5%. The highest efficiency value is 83%, and 83% is at the 48V500W power point. He said that this motor is 72V1500W. We bought it and used it at 72V. The efficiency at 1500W is only 65%.

SIVO Motor is a high-tech enterprise focusing on motor R&D, manufacturing and sales.Our main products are Single Phase Induction Motor,Well Pump Motor,Three-phase Blower Motor,pump motor,Permanent Magnet DC Motor,carpenter motor,Three-phase PMSM Motor,Water Pump Motor and other fan special motor series.