JB/T 5271-2010 in English

1 Scope

This standard specifies the types, basic parameters and dimensions, technical requirements, inspection rules, and requirements for marking, packaging and warranty period of Y series (IP23) induction motor.
This standard is applicable to Y series (IP23) three-phase induction motor (frame size 160~355) (hereinafter referred to as "motor"), and all other series motors derived from Y series (IP23) three-phase induction motor may also refer.

Contents
Foreword I
1 Scope
2 Normative References
3 Types, Basic Parameters and Dimensions
4 Technical Requirements
5 Inspection Rules
6 Marking, Packaging and Warranty Period
Table 1 Corresponding Relation between Frame Size and Rotating Speed & Power
Table 2 Motor with Foot on Frame and No Flange on End Cover
Table 3 Dimensions and Tolerances of Key
Table 4 Radial Circular Runout Tolerance
Table 5 Parallelism Tolerance
Table 6 Flatness Tolerance
Table 7 Symmetry Tolerance of Key Groove
Table 8 Guarantee Values of Efficiency and Power Factor
Table 9 Guarantee Ratio of Locked-rotor Torque to Rated Torque
Table 10 Guarantee Ratio of Minimum Torque to Rated Torque
Table 11 Guarantee Ratio of Maximum Torque to Rated Torque
Table 12 Guarantee Ratio of Locked-rotor Current to Rated Current
Table 13 Tolerance of Guarantee Value of Electrical Performance
Table 14 Interval Time after Power-off
Table 15 Vibration Strength Limits (Root-mean-square Values) for Different Shaft Center Heights Expressed with Displacement, Speed and Acceleration
Table 16 Noise of A-weighted Sound Power Level under No Load
Table 17 Noise of A-weighted Sound Power Level under Load
Table 18 Mark at Outlet Terminal