· Features and application YZR. YZ. Series motor for crane and metallurgical uses, featured with large overload capacity and adequate mechanical strength, is specially suitable for driving various types of crane and metallurgical machine or other similar equipment.
YZR series motor is of wound rotor type, while YZ series motor is of squirrel cage type.· Performance There are eight types of duty type for these series motors, S2,S3,S4,S5,S6,S7,S8 and S9. The basic duty type is S3－40% (duty type is S3, cyclic duration factor is 40%, each cyclic is 10min). The following duty types are most useful to these series motors.
1．Short-time duty type (S2)
Operation of constant load during a given time, less than that required to reach thermal equilibrium, followed by a rest and de-energized period of sufficient duration to re-establish machine temperature within 2 deg K of the coolant.
2. Intermittent periodic duty type (S3)
A sequence of identical duty cycles, each including a period of operation at constant load and a rest and de-energized period but the operation period are so short that it is not sufficient for the machine to reach thermal equilibrium In this duty type, the cycle is such that the starting current does not significantly affect the temperature rise.
3. Intermittent periodic duty type with starting (S4)
A sequence of identical duty cycles, each including a significant period of starting, a period of operation of constant load and a rest and de-energized period, but the operation period are so short that it is not sufficient for the machine to reach thermal equilibrium.
4. Intermittent periodic duty type with electric braking (S5)
A sequence of identical duty cycles, each consisting of a period of starting, a period of operation at constant load and a rest and de-energized period, but the operation period are so short that it is not sufficient for the machine to reach thermal equilibrium.
5. The motor will operate satisfactorily under following conditions:
(1) Ambient temperature not exceeding 40℃ (for crane uses) or 60℃ (for metallurgical uses).
(2) Not above sea-level 1000m.
(3) Frequent and significant mechanical vibration and shocks.
(4) Frequent starting, braking (electrical or mechanical) or reversing.
6. The rated frequency of the motor is 50Hz and rated voltage is 380V.
7. Connection: The stator winding is connected in Y for 132kW and below and in △ for the rest. In Y with zero lead is also supplied.
8. Output and speed
The range of rated output and, synchronous speed for the basic duty type (S3-40%) are shown in table 1.table 1FrameSynchronous speed1000750600r/minr/minr/min112M1.5132M12.2M23.7M15.5160M27.5L117.5180L1511200L2215225M3022250M13730M24537280S554537M755545315S7555M9075M190355L1110L2132400L1160L2200
9. For YZ series motors, when working with basic duty type the guaranteed values of the ratio of the maximum torque and the locked rotor torque to the rated torque under rated voltage are given in table 2.table 2Rated Power(kw)Max. Torque TM/Rated Torque TNBlock Torque/Rated Torque TN≤5.522＞5.5～112.32.3＞112.52.5
10. For the YZR series motors, when working with basic duty type, the guaranteed values of the ratio of the maximum torque to the rated torque under rated voltage are given in Table 3.table 3Rated Power(kw)Max. Torque TM/Rated Torque TN≤5.52.3＞5.5～112.5＞112.8
11. The moment of inertia Jm, open-circuit voltage, no-load current and weight of motor are shown in Table 4.Series Frame 1000r/min 750r/min 600r/min Weight（Kg） Jm(kg-m) Open-circuit rotor voltage （V） No-load Current （A） Jm(kg-m) Open-circuit rotor voltage（V） No-load Current （A） Jm(kg-m) Open-circuit rotor voltage（V） No-load Current （A） YZR 112M 0.03 100 2.7 73.5 132 M1 0.06 132 3.3 97 M2 0.07 185 4.5 108 160 M1 0.12 138 7.5 154 M2 0.15 185 10.5 160 L 0.20 250 13 0.20 205 11.9 174 180L 0.39 218 18.8 0.39 172 14.8 230 200L 0.67 200 26.6 0.67 178 19.7 317 225M 0.84 250 32.3 0.82 232 28.3 390 250 M1 1.52 250 27.2 1.52 272 34.5 512 M2 1.78 290 30.8 1.79 335 43.7 559 280 S 2.35 280 38.4 2.35 305 54.9 3.58 150 49 745 M 2.86 370 51.9 2.86 360 55.9 3.98 172 59 840 315 S 7.22 302 69.1 7.22 242 74.2 1026 M 8.68 372 64.6 8.68 325 99.2 1156 355 M 14.32 330 97.3 1520 L1 17.08 388 104.3 1764 L2 19.18 475 147.1 1810 400 L1 24.52 395 111 2400 L2 28.10 460 126 2950 YZ 112M 0.022 2.5 58 132 M1 0.056 3.1 80 M2 0.062 4.1 91.5 160 M1 0.114 6.5 118.5 M2 0.143 9.3 125 L 0.192 11.2 0.192 11.1 152 180L 0.352 12.2 205 200L 0.622 18.3 276 225M 0.820 24.3 347 250M1 1.432 33 462 · Model explanation 
· Structure 1. Degree of protection
The clegree of protection of enclosure of metallurgical motors is IP54 and that of crane motors is IP44.
2.Cooling method
Frame 112-132 IC0041
Frame 160-355 IC0141
Frame 400 IC0151
3. Construction and mounting arrangemens are shown in table 5.
4. Insulation class
The insulation of metallurgical motors is of H class and that of crans motors is F class.
5. Terminal box
The terminal box for the stator is fitted on the top of the frame and connection can be made on either side ,of the framse.
6. Type of drive
Motors are designed for coupling or spursear drive when gear drive is used, the pitch diameter of the pinion should not be less than twice of that of the shaft extension.
7. Brush holder and brush
The brush molders of the YZR series motors are provided with spring of constant pressure of the latest design so that the pressure between the collector ring and brush can remain unchanged while the brush are worn out during operaton. The type of brushes used is J201 and size sare shown in table 7.
8. Bearing
The type of bearing used in these series motors are shown in table 6.
9. Collector ring for the YZR series
The collector ring for frame 112-250are of the plastic mould pressed type ,while those for frame 280-400 are of the sleeve type.
1. Fan 2. Front end cover 3. Stator 4. Rotor 5. Terminal Box
6. Upper cover 7. Inspection Windon cover 8. Brushi assy 9. Bearing 10. Flat key
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