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Features and application 
YB2 series motor has these good features of high efficiency, energy saving, big temperature-rising rang, life, excellent performance ,low noise, small libration, high-grade protection, advanced explosion-proof structure, safety& reliability,
convenient saving power equipment being applied in the industries of coal, oil, chemical industry etc. 

Construction Features
1.The explosion proof constructions for Ex d I，Ex dII AT4，Ex d II BT4 are available．
2.The degree of protection is IP55 for motor main enclosures．
3.The cooling form is IC411．
4.The stator windings are of class F insulation and ensures a large margin of safety in temperature rise and long service life．
5.A cylindrical shaft extension is equipped on motors，which is driven by coupling or spur gearing．
6.The stator windings are wound with polyester enamel round wire of high strength and then treated with the progress of vacuum pressure impregnation to make them become a solid integral, therefore, the winding insulation is excellent in electrical and mechanical properties，moisture resistance and thermal stability．
7.The rotors are made of cast-aluminum，and dynamically balanced to make the motor operate smoothly with small vibration and low noise
8.The stator and rotor cores are laminated with high-class electrical steel sheet with high permeability and low loss，thus makes the motors possess low class and high efficiency．
9.The motors are fitted with low vibration and low noise bearings special for motors．For the motors of frame size 160 and below，bilaterally shieldedball bearings are used and corrugated spring washers at the driving ends pressed on bearings with proper pressure to restrain effectively the vibration and noise produced during motors’operation．For the motors of frame size 180 and above．the bearings with inner and outer covers are used and retaining rings at bearing position areequipped on shafts to prevent the rotor efficiently from moving axially． In order to operate safely and reliably，the bearings of the motors flame size 180 and above are pro-vided with greasing Attachments，which are of the use to drain or replenish the lubricating grease without stopping the motors．For the frame size 250 and above，the position for mounting bearing temperature monitoring censers are preliminary left. 
10.For the motors of frame size 280 and below，the fans are made of frictional electric proof plastic， being of small inertia movement and low loss characterize．However,for the motors of frame size 315 and above，the cast-aluminum or steel-plate-welded fans are fitted which are of light weight and high strength．For the whole series motors，the fans are key-jointed on the shaft to make the motor operation safely and reliable．The cowls are made of fabricated steel plate．on a prerequisite of preventing from the ingress of solid substances of certain size，they enable the motors to get maximum area of ventilation in order to form adequate currents．
11.Terminal box：The protection degree for the enclosure is IP55 The terminal box is located on the top of the 
Motor．The inside of the terminal box is spacious and easily accessible．Cables can be fitted either from left or right side of the terminal box．Lead-in can be of rubber sheathed cable or steel pipe wiring．According to different requirement of starting the motor, the terminal box is made of either one entry for direct staring or double entry for Y-△ starting threaded explosion proof structure is provided between the terminal box base and the main space of the flame．Between the terminal box base and the connecting tunnel a connecting sleeve is equipped with rubber pad fitted inside for hermetic seal．When servicing，it is not necessary to remove the rubber pad but only the connecting sleeve is to be removed，to ensure explosion proof．The terminal box is designed to have three or six terminals upon request．A terminal for grounding is provided in the terminal box for safety.

OPORATING CONDITIONS
1.Rated voltage：380V/660V or on request.
2.Rated frequency：50Hz or 60Hz
3.Duty/rating:continuous(S1)
4.Explosion-proof marks：Exd I，Exd II AT4．Exd II BT4
5.Protection class：IP55
6.Cooling method：IC411．
7.Ambient temperature: -15℃～40℃
8.Altitude: not exceeding 1000meters above sea level.
9.Relative humidity: less than 90%