Redhead Electric Motors
NEMA B efficiency three phase induction motors are totally enclosed fan cooled squirrel cage motors that are manufactured with new material and technology.
- Kind of motor: Squirrel-cage Induction Motor, NEMA B Design
- Design Standard: NEMA MG1
- Frame No: 213T ~ 449T.
- Output Range: 1-300 HP
- Ambient Temperature: 40 Cmax
- Altitude 1000m
- Duty: Continuous (S1)
- Rated Frequency: 60Hz (50Hz is available on request).
- Rated Voltage: 460V (380V is available on request).
- Service Factor: 1.15 or 1.0
- Protection Enclosure: TEFC, IP55
- Cooling Method: Surface Cooling (IC411)
NEMA B efficiency motors have some notable advantages such as high efficiency, good starting performance, low noise, improved structure, and improved cooling capabilities. These motors are three phase induction motors which can be used for general motors and may also be used to drive all kinds of general purpose machines such as compressors, ventilators, pumps, etc. Other uses include petrol chemical, medical, chemical industries and mining. For special requirements please contact our sales department.
The stator core is laminated with high quality electrical steel with high permeability and low losses allowing the motors to operate more efficiently.
The stator windings utilize Class F insulation (Class H insulation is available on request)with polyimide enamel round wire and VPI treated providing strong mechanical support, superior electrical insulation, misture and contamination resistance, and uniform heat dissipation.
Thermistors(PTC) are embedded in windings (Thermostats are available on request), one each phase.
|Frame size||Drive end bearing||Non-drive end bearing|
|NEPM40||2P: 6313 | 4,6P:6318||2P: 6313 | 4,6P:6318|
|NEPM444-445||2P: 6314 | 4,6P: NU319||2P: 6314 | 4,6P: NU319|
|NEPM447-449||2P: 6314 | 4,6P: NU319||2P: 6314 | 4,6P: NU319|
Bearing and lubrication
The motors are fitted with low noise and low vibration bearing special for motors. For the motors in frame size 210, bilaterally shielded ball bearing are used without replenishing grease. For the motors in frame sizes 250 and above, the open bearing are equipped with attachments having the function to drain and replenish lubricating grease without stopping the motor. No. 3 Lithium Base grease is used unless specified otherwise. Bearing design life is at least 40000 hours at rated load. Bearing size, see table 1.
The conduit box is on the central libe of the enclosure. It can be F1/F2 convertible. The conduit box is made of cast iron and the opening utilizes Standard NPT threads (Metric threads and holes are available on request). There are grounding bolts and a connection diagram inside the conduit box.
Motor main leads and thermistor leads are loose keeping in conduit box (Therminal blocks are available on request).
Fan and Fan Cover
The fan is made of plastic or cast iron to different applications. The fan cover is made of steel sheet or cast iron depending on different operating conditions.
A sunshade is recommended when the motor is intended for outdoor installation in direct sunlight with an ambient temperature rating of over 40 degree C.
Electric Motor Specs
|NEMA B Motor||Description||Product ID|
|5HP||6P 215T 60HZ 230/460V||RH0056|
|10HP||6P 256T 60HZ 230/460V||RH0106|
|15HP||6P 284T 60HZ 230/460V||RH0156|
|20HP||6P 286T 60HZ 230/460V||RH0206|
|25HP||6P 324T 60HZ 230/460V||RH0256|
|30HP||6P 326T 60HZ 230/460V||RH0306|
|40HP||6P 364T 60HZ 230/460V||RH0406|
|50HP||6P 365T 60HZ 230/460V||RH0506|
|60HP||6P 404T 60HZ 230/460V||RH0606|
|75HP||6P 405T 60HZ 230/460V||RH0756|
|100HP||6P 445T 60HZ 230/460V||RH1006|
|150HP||6P 449T 60HZ 230/460V||RH1506|