General
Y2 ranges of conventional three-phase induction motors are flame-proof motors obtained by renewal and generation-changing of Y ranges of motors. The performances of the products have come up to advanced international standards.
The motors have the advantages of higher efficiency,energy saving, higher locked-rotor torque, lower noise,smaller vibration, safe and reliable operation and beautiful appearance, etc. The outputs, mounting dimensions and their corresponding relationships comply with IEC standards.

Construction
Degree of protection by enclosure of motors is IP55.
The frames of motors are designed with parallel cooling ribs which are distributed vertically and horizontally.
The bearings of motors are ball bearings. The fans are of small diameter and wide vanes. In addition to them,reasonable electromagnetic parameters and proper slot combinations and slot-skewing slopes are selected so that the vibration and the noise of motors have effectively been controlled.
The stator windings of the motor are class F insulated.When the altitude above sea level and ambient temperature are in accordance with the values specified by the standard,the temperature rise limit of stator windings is 80K(resistance method). For frame size 315L2-and 4-pole motors and frame size 355 motors, the temperature rise limit is 105K.
The cable entry form for the terminal box of YB2 range of motors is of cabtyre cable. The terminal box is provided with three terminals (for single voltage) or six terminals(for double voltages). The terminal box is located on the top of the motor. On request of user, armoured cable can also be applied.
The direction of rotation of the motor. For frame sizes H63 to 280 and H315 to 355 motors (4 to 10-poles), the direction of rotation may be clockwise and anticlockwise, and for frame sizes 315 to 355 2-pole motors, the direction of rotation is clockwise as viewed from the shaft extension. If the motor is required to rotate anticlockwise, please specify it when ordering.

Ambient Conditions
Ambient air temperature changes with season, but does not exceed 40℃ and is not lower than -15℃.
Altitude above sea level: up to 1000m.
Note: when ambient air temperature and altitude are different from the above, refer to GB755.
In the moistest month, the monthly-average maximums relative humidity is 90%, and the minimum temperature does not exceed 25℃ in this month .
Rated frequency: 50Hz.
Rated voltage: 380V.
Note: If you have special requirements for frequency,voltage, ambient air temperature and altitude, etc. pleacify them when ordering.

Ordering Information
1. Specify the type motors, rated output, synchronous speed, voltage, frequency, mounting arrangement,explosion-proof group, degree of protection the cable entry form of the terminal box and so on. number of poles, voltage, frequency, mounting, arrangements and other requirements.
2. If you have special requirements for the motor noise, degree of protection and greasing and draining oil debices of the bearings, etc. Pleasenote them in the contract.
3. This catalog is only for user reference, and specific data are subject to change without notice.

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