Drive motor torque

A pressurized direct-drive concentric cylinder viscometer system (Figure 3-21) was used to obtain shear rate versus shear stress data on a tomato puree at several fixed temperatures between 76 and 120°C (Figure 3-22), and temperature versus apparent viscosity data at several shear rates on a 4% waxy rice (WR) starch dispersion during gelatinization over the temperature range 30 to 110°C (Figure 3-23) (Rao et al., 1998). The drive motor, torque unit, and concentric cylinder unit and temperature control vessel of a Haake RV2 viscometer system (Haake Inc.) were placed in a chamber (PRC) that could be pressurized to 0.2 MPa (two atmospheres). The temperature control vessel was insulated to minimize heat loss. A eopper-constantan (36 gage wires) thermocouple plaeed in the well of the inner eoneentric eylinder measured the temperature of the test sample. 

A satellite tracking antenna has an angle 6 (radians) with the horizontal axis that must change as the satellite travels across the sky. To accomplish this, a feedback controller Gc(s) is used. The controller s setpoint is the desired angle and its output is the drive motor torque on the antenna T, Wind also exerts a torque on the antenna Tp. The equation of motion of the antenna is... 

Component Electric Hoist Motors and Controls. Both hoists have enclosed, nonventilated, 220/440-V, three-phase, 60-Hz, 1200-rpm (rev/min) motors. The control used on hoist motions is referred to as the static stepless magnetorque control on the manufacturer s drawings. With this control, drive motor torque is controlled by means of fixed resistors and saturable reactors in the... 

Drive motors should be of the high-starting-torque type and selected for 1.33 times maximum rotational speed. For two- or three-diameter Idlns, the brake horsepower for the several diameters should be calculated separately and summed. Auxiliaiy drives should be provided to maintain shell rotation in the event of power failure. These are usually gasohne or diesel engines. 

Two-winding motors may be built for constant torque, variable torque, or constant horsepower. Constant-horsepower motors are capable of handling the same horsepower at both speeds (i.e., higher torque at the low speed). Constant-torque motors can handle the same load torque at either speed (e.g., conveyor drives). Variable-torque motors are designed for loads in which load torque varies as the square of speed and horsepower varies as the cube of speed. Typical applications are as follows ... 

One of the critical measurements is torque or shaft power. A variety of methods is recognized direct methods such as torque meters or reaction mounted drivers (dynamometers) and indirect methods such as electrical power input to drive motors, heat balance, or heat input to a loop cooler. See Part 7, Measurement of Shaft Power, PTC 19.7 1961 [3] for additional information. 

Motor Torque, 651 Power Factor for Alternating Current, 652 Motor Selection, 653 Speed Changes, 654 Adjustable Speed Drives, 659, Mechanical Drive Steam Tmbines, 659 Standard Size Turbines, 661 Applications, 662 Mtyor Variables Affecting Turbine Selection and Operation,... 

In order to pump a fluid of SG = 0.9 at a rate of 1000 gpm through a piping system, a hydraulic power of 60 hp is required. Determine the required pump head, the torque of the driving motor, and the estimated impeller diameter, if an 1800 rpm motor is used. 

Compared to conventional processing tasks, the extruder drive motor is usually quite small for degassing processes, because the intake of polymer solutions or polymer melts does not require a high torque consumption. The use of a back vent depends on the amount of... 

Figure 3-13 Vane Yield Stress Setup at Controlled Strain Qiu and Rao (1988). The Numbers Denote Separate Pieces of Equipment 1—torque unit, 2—vane, 3—constant temperature vessel for sample, 4— constant temperature bath, 5—viscometer drive motor, 6—viscometer control panel, 7—chart recorder for torque output, and 8— voltmeter to monitor vane rpm signal.

Internal mixers must be ran in a full or nearly full condition, so a batch recipe is calculated to provide an appropriate volume. If not filled, the ingredients will not be properly sheared and heat transfer will be compromised. Typical commercial mixers have a batch size of at least 100 pounds of compound. A mixer of this size will have a drive motor of no less than 75 horsepower. Proper dispersive mixing is a balance between proper shear, sequence of addition of ingredients, and thermal stability. Mixers have extensive monitoring instrumentation that provides continuous feedback about thermal conditions, rotor torque, and rotor speed. Once a mixing process has been developed, a standard protocol is followed for preparation of the compound. 

The drive motor is a brushless dc torque motor, rated for continuous duty. Motor winding insulation is a high grade material which is capable of a service life of 40 years in the reactor helium atmosphere. The stator windings are vacuum impregnated. 

Torque in foot pounds Horsepower of the drive motor... 

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