March 20, 2025
External rotor permanent magnet synchronous motor
1. Permanent magnet
Adopt N40UH grade neodymium iron boron rare earth permanent magnet material, with a temperature tolerance of not less than 180℃, a service life of not less than 20 years, and a demagnetization rate of not more than 1% every 10 years. The magnet is fixed with a cage-type embedded structure with its own patented technology, which has very good overload resistance, is firmly fixed and effectively prevents external damage and detachment.
2. Stator winding
The stator winding is equipped with a dehumidification heater, and the winding and front and rear bearings are equipped with PT100 temperature sensors.
The distributed forming winding-flat copper wire structure has better heat dissipation performance, more reliable inter-turn insulation, greater slot fill rate and power density; the inter-turn insulation adopts advanced high-voltage resistant polyimide sintering + mica tape winding method, which has super strong corona resistance, insulation performance and low power density. After VPI vacuum pressure varnish treatment and then rotating constant temperature drying, the residual water rate is low, the insulation level is higher, and it has good moisture and waterproof performance. The integrity between the windings is good and has better mechanical properties. It has high insulation strength: power frequency withstand voltage ≧8000V, high efficiency: the back electromotive force waveform is closer to sine, the harmonic loss is small, and the wave interference is low: short-distance distributed windings can greatly weaken high-order harmonics.
3. Stator cooling water channel
The double spiral cooling water channel independently developed by our company is used. The water channel is treated with polytetrafluoroethylene coating to prevent rust; the inlet and outlet water channels are arranged in a spiral "wrap" at intervals on the drum stator inlet and outlet water channels, making the cooling more efficient, the temperature of the drum machine more balanced, and high-pressure water can be used for emergency cooling.
4. Drum rubber coating
The drum rubber coating of our company adopts the rubber sheet of the international first-line brand TIPTOP. In order to ensure production efficiency and product quality stability, our company independently developed automatic rubber coating equipment, automatic grinding equipment, and automatic magnetic steel assembly equipment, eliminating product quality fluctuations caused by manual operation and improving product quality stability and reliability.
5. Protection level: IP65
The explosion-proof requirements are strictly designed in accordance with GB/T 3836, and the explosion-proof mark is "ExdbIMb". The drum adopts IP65-level fully sealed bearing isolator, the lowest surface is less than 1m underwater, more than 30 minutes, and the life is 5 times that of the commonly used skeleton seal. It can isolate the entry of external dust and resist strong water spraying from all sides without damage, and is suitable for harsh environments such as high dust and humidity.
