Motors characteristics

Figure 12.60 Coordination of MPCB characteristics with the motor characteristics (eliminating the use of HRC fuses)...

The motor and gear combination must provide the proper input speed to the compressor. Therefore, speed selection should consider whctRei the 1,800 rpm, or the 1,200 rpm motor and the corresponding gear provides the more economical combination. Before selecting motor speed, motor characteristics should be obtained for both speeds. The speed-torque and speed-current curves, power factor and efficiency values should be compared and evaluated. The most important considerations in matching the motor to a compressor are ... 

DESIGN MOTOR CHARACTERISTICS VOLTS PHASE CYCLE... 

SATUR OR TOTAL TEMP. EXHAUST STEAM PRESSURE MOTOR CHARACTERISTICS ... 

As die composition of diesel particulates (e.g. fi action of adsorbed hydrocarbons) depends upon many motor characteristics as engine load, speed, and various temperatures, it is difficult to collect batches of soot with constant properties. Tlierefore, we choose to work with printex-U (a flame soot supplied by Degussa AG) as a model soot. Properties of tliis model soot and diesel particulates collected from a one cylinder direct injected diesel engine (Yanmar L90E diesel generator set) are listed in Table 1. 

Washizu, M., Kurahashi, Y., lochi, H., Kurosawa, O., Aizawa, S.-L, Kudo, S., Magariyama, Y. and Hotani, H. (1993). Dielectrophoretic measurement of bacterial motor characteristics. IEEE Trans. Industry Appl. 29, 286-294. 

Identification of Rocket Motor Characteristics from Infrared Emission Spectra... 

For induction motors, the total current can be approximated by the vector sum of the torque producing component and the magnetising or flux producing component of motor current. These two current vectors are in quadrature, and as the hoist torque approaches zero, the motor current approaches magnetising current. Electrical RMS calculations for hoist motors must be based on motor current, and so the calculation based on torque current only is not accurate for induction motors, and under-estimates the induction motor current. For greatest accuracy the duty cycle must be calculated with the correct motor characteristics. 

Induction motors are popular because of their simplicity and ruggedness. Induction motor characteristics such as magnetizing current affect the RMS current calculation, and must be taken into account when selecting a motor for a mine hoist duty. 

Electric-motor application for the plant engineer is the common-sense matching of load requirements with motor characteristics. Motor types, styles, sizes, mountings, and enclosures vary greatly. So the first step in using electric motors correctly is to understand them and the terminology the motor industry uses to describe them. 

Motor application begins by matching load requirements with motor characteristics. A correctly applied motor must be able to start the load, bring it up to operating speed, and run as long as necessary through all expected variations in the load. 

Type of motor best suited to a particular application is a major question because of the wide variety of motor types available.Tables 5.31 and 5.32 provide some guidehnes, the first one by motor characteristics, the second by application. 

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