Mounting induction motors

Motor H"hp, split-phase induction, 60-cycIe, 110-volt, a-c, General Electric explosion-proof motor Mounting Integral pump and motor... 

Motor drive 1%-hp, 220-440-volt, 3-phase, 60-cycle, a-c, squirrel-cage induction motor, 1,750 rpm with V-belt drive Mounting On 10-in. channel iron base Available from F. J. Stokes Machine C-o., Philadelphia, Pa. 

Externally mounted fans on the shaft or in the heat exchangers should be made of a material that cannot produce a spark if the blades happen to touch their surrounding metalwork. See also sub-section 5.1.8 for further comments on the construction of induction motors. 

The simplest method of achieving the effect is to insert extra resistance into the rotor circuit. The rotor of the induction motor has to be specially wound so the winding can be split into three sections. Each section is connected to shaft-mounted slip-rings. The conductors of the rotor winding are carefully insulated from the iron core and from each other. The extra resistance is an external static unit mounted near to the motor. 

The new hoist installed is the first in the potash industry to have induction motors compared with the synchronous motors used on all the new hoists at other sites. It will also surpass the Allan hoist as the largest ground mounted once fully commissioned and in production. It features the following specifications ... 

Since 2007, Enova/IC posttransmission parallel PHEBs have operated in California and Florida school districts. In 2009, DOE funded Enova and IC/Navistar with Federal stimulus dollars to deploy 16 PHEB school buses nationwide. It couples a diesel engine with an 80-kW AC induction electric motor mounted behind the transmission (post-transmission) and a hybrid controller with a battery care unit (BCU) to monitor the battery voltage, SOC, amp-hours, kWh, and temperature. The BCU controls a safety disconnect unit to ensure the safety of the battery pack during charging and provides surge protection and automatic disconnect in case a ground fault occurs. 

Up to four electric motors, each comprising 30 kW, were used to drive the vehicle. Each wheel had a converter feeding a motor to drive the wheel directly. As it was a mobile testing array, all four motors were of different types but all had the same nominal power of 30 kW. Thus, at the front, there was a permanent-magnet wheel motor with sine control and a permanent-magnet wheel motor with trapeze control. The magnets in these motors were mounted on the surface. At the rear, there was an induction motor with vector control and a synchronous claw-pole motor with sine control. The converters were adapted to the type of motor, with only the level of control in terms of torque, and therefore current, being pre-defmed. It was the front motors which offered the best performances, particularly for the startup torque, which reaches up to six times the nominal torque of 700 N.m. 

Squirrel cage A term used to describe the construction of one type of induction motor. The rotor is made of an iron core mounted on a concentric shaft. Copper, brass, or aluminum bars run the entire length of the core in slots on the core. These bars act as conductors and are fas-... 

In order to compare the physical dimensions of the lEC and NEMA induction motors Table 5.25 shows the comparison of the lEC standard induction motor shaft heights H and the nearest NEMA standard shaft height D, for the T frame line of NEMA induction motors. The shaft height dimension H in millimeters for the lEC standard and the D dimension in inches for the NEMA standard motors are defined as the distance from the centerline of the shaft to the bottom of the mounting feet. For other mounting dimensions, the specific metric motor should be determined. 

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