MOTORS Technical Information Orbital Motors Type RE

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Contents Chapter 1 _______________________________________________________________________ 4 Technical Information __________________________________________________________________ 4 Operating Recommendations ____________________________________________________________________ 5 Motor Connections ____________________________________________________________________________ 7 Product Testing _______________________________________________________________________________ 8 Allowable bearing & shaft loading ________________________________________________________________ 9 Vehicle drive calculations...

Chapter 1Technical InformationTopics: • Operating Recommendations • Fluid viscosity & filtration • Motor protection • Hydraulic motor safety precaution • Motor/brake precaution • Motor Connections • Product Testing • Allowable bearing & shaft loading • Vehicle drive calculations • Induced side load • Hydraulic Equations WHITE can accept no responsibility for possible errors in catalogues, brochures, and other printed material. WHITE reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequent...

Operating Recommendations Oil type Hydraulic oils with anti-wear, anti-foam and demulsifiers are recommended for systems incorporating these motors. Straight oils can be used but may require VI (viscosity index) improvers depending on the operating temperature range of the system. Other water based and environmentally friendly oils may be used, but the service life of the motor and other components in the system may be significantly shortened. Before using any type of fluid, consult the fluid requirements for all components in the system for compatibility. Testing under actual operating conditions...

Motor/brake precaution Caution! - The motors/brakes are intended to operate as static or parking brakes. System circuitry must be designed to bring the load to a stop before applying the brake. Caution! - Because it is possible for some large displacement motors to overpower the brake, it is critical that the maximum system pressure be limited for these applications. Failure to do so could cause serious injury or death. When choosing a motor/brake for an application, consult the performance chart for the series and displacement chosen for the application to verify that the maximum operating pressure...

Motor Connections Motor circuits There are two common types of circuits used for connecting multiple numbers of motors – series connection and parallel connection. Series connection When motors are connected in series, the outlet of one motor is connected to the inlet of the next motor. This allows the full pump flow to go through each motor and provide maximum speed. Pressure and torque are distributed between the motors based on the load each motor is subjected to. The maximum system pressure must be no greater than the maximum inlet pressure of the first motor. The allowable back pressure...

Product Testing Performance testing is the critical measure of a motor’s ability to convert flow and pressure into speed and torque. All product testing is conducted using a state-of-the-art test facility. This facility utilizes fully automated test equipment and custom designed software to provide accurate, reliable test data. Test routines are standardized, including test stand calibration and stabilization of fluid temperature and viscosity, to provide consistent data. The example below provides an explanation of the values pertaining to each heading Intermittent Ratings -10% of Operation...

Allowable bearing & shaft loading This catalog provides curves showing allowable radial loads at points along the longitudinal axis of the motor. They are dimensioned from the mounting flange. Two capacity curves for the shaft and bearings are shown. A vertical line through the centerline of the load drawn to intersect the x-axis intersects the curves at the load capacity of the shaft and of the bearing. In the example below the maximum radial load bearing rating is between the internal roller bearings illustrated with a solid line. The allowable shaft rating is shown with a dotted line. The...

Vehicle drive calculations When selecting a wheel drive motor for a mobile vehicle, a number of factors concerning the vehicle must be taken into consideration to determine the required maximum motor RPM, the maximum torque required and the maximum load each motor must support. The following sections contain the necessary equations to determine this criterion. An example is provided to illustrate the process. To determine maximum motor speed RPM = Step One: Determine Rolling Resistance Rolling Resistance (RR) is the force necessary to propel a vehicle over a particular surface. It is recommended...

11 Step Three: Determine Acceleration Force Acceleration Force (FA) is the force necessary to accelerate from a stop to maximum speed in a desired time. Where: t = time to maximum speed (seconds) 5 x 1500 lbs Example FA = 22 x 10 Step Seven: Determine Wheel Slip To verify that the vehicle will perform as designed in regard to tractive effort and acceleration, it is necessary to calculate wheel slip (TS) for the vehicle. In special cases, wheel slip may actually be desirable to prevent hydraulic system overheating and component breakage should the vehicle become stalled. W x f x ri (lb − in per...

Induced side load In many cases, pulleys or sprockets may be used to transmit the torque produced by the motor. Use of these components will create a torque induced side load on the motor shaft and bearings. It is important that this load be taken into consideration when choosing a motor with sufficient bearing and shaft capacity for the application. To determine the side load, the motor torque and pulley or sprocket radius must be known. Side load may be calculated using the formula below. The distance from the pulley/sprocket centerline to the mounting flange of the motor must also be determined....