DC Buyer's Guide

Application Information CD180AT-CD6900 Frames

Environmental Effects On Brushes

V-Belt Drives The V-belt system produces a heavy shaft and bearing [^PSX]V \PZX]V Xc ]TRTbbPah cWPc cWTbT UPRc^ab QT considered carefully for proper application. Since belt drives impose a bending moment on the motor shaft, it is always desirable to have the motor sheave located as close to the motor bearing as possible to minimize both bearing load and shaft stress. This will result in increased bearing life. The bearing life curves that follow assume the load is centered at the end of the shaft. Improved V-belts can significantly reduce the number and size of belts required for a given load. These new belts should always be considered, since the sheave will be shorter and the load centered closer to the bearing. The standard NEMA shaft extension is designed for belted loads. Dimensions are provided on the standard dimension sheets. A sliding base is available as an accessory to facilitate belt adjustment. Bearing Life Bearing life for belted drives is determined by calculating the radial load at the end of the shaft. The radial load, W, produced by the belts when tightened just enough to transmit the load without slipping is given by the relation: F , ( 126,000 ) ( HP ) ( K b , lbs ) D RPM Where: 3 , BWTPeT _XcRW SXP\TcTa X] X]RWTb U^a V-belt application. HP , Maximum ratio of horsepower, including overloads, RPM to the minimum speed at which that power occurs. K b , 1T[c cT]bX^] UPRc^a Ua^\ cPQ[T QT[^f)

Brush Wear Caused by Silicone

Speed Range By Armature Control Standard motors are suitable for reduced speed operation by adjustable armature voltage. Some torque de - rating may be necessary for applications requiring extended periods of low speed operation. For specific duty cycles contact Wolong . Ambient Conditions Standard Kinamatic™ drip - proof fully guarded and totally enclosed motors are designed for operation in a 40°C ambient temperature and at altitudes up to 3,300 feet above sea level. Direction of Rotation Motors in frame sizes CDL182AT-CD5010AY are suitable for continuous rotation in either direction or for reversing duty. Motors in frame sizes CD6000-CD6900 are suitable for continuous operation in the rotation specified on the nameplate for reversing duty. Motors in all frame sizes are generally suitable for continuous rotation in either direction or for reversing duty. In frame sizes CD6000-CD6900 applications in contaminated environments require that brushes be trailing for the desired rotation. If not, they may experience rapid brush wear during continuous operation with the brushes stubbing. Performance Kinamatic motors meet NEMA standards for industrial equipment. Regulation € BTT =4<0 BcP]SPaSb Excitation € BTT \^SXUXRPcX^] _PVTb ^a ]^cTb ^] _aXRT _PVTb for standard shunt field voltages. Parallel Operation € FWTaT \^c^ab PaT c^ QT ^_TaPcTS X] electrical and mechanical parallel, refer to Wolong . WARNING : The presence of silicone in DC Motors, particularly totally enclosed constructions, will cause rapid brush wear. Sources of silicone include oils, RTV compounds, mold release agents, and some insulating varnishes. These silicone substances must be avoided to ensure proper DC motor performance.

Motor Pricing General Information

Other Information Application Information Outline Dimensions Accessories and Modifications

BELT TENSION FACTOR, K b

K b

Description

1.0 1.2 1.5 1.8 2.0

2WPX] P]S B_a^RZTc 3aXeT

Timing Belt

V-Belt, 1:1 Ratio

V-Belt, 2:1 Speed Decreased Ratio

Flat Belts

The curves which follow can be used to determine the L10 [XUT fWXRW Xb cWT [XUT X] W^dab cWPc ( ^U QTPaX]Vb fXcW cWXb load would be expected to exceed without failure. The standard ball bearing and standard shaft option will be the most economical, if acceptable life is obtained from the curve. A commonly used design figure is 20,000 hours.

5.5

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GEP387-EN 07/19 Prices and data subject to change without notice.