PANASONIC Industrial SERVO MOTOR MSM042A1B FREE EXPEDITED SHIPPING MSM042A1B

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MHMA202S1F MHMA302S1F MHMA402S1F

MHMA502S1F MHMA102S1G MHMA152S1G

MHMA202S1G MHMA302S1G MHMA402S1G

MHMA502S1G MHMA102S1H MHMA152S1H

MHMA202S1H MHMA302S1H MHMA402S1H

MHMA502S1H MHMA102S1N MHMA152S1N

MHMA202S1N MHMA302S1N MHMA402S1N

MHMA502S1N MHMA102S1P MHMA152S1P

MHMA202S1P MHMA302S1P MHMA402S1P

MHMA502S1P MHMA102S1Q MHMA152S1Q

MHMA202S1Q MHMA302S1Q MHMA402S1Q

MHMA502S1Q MHMA102S1R MHMA152S1R

MHMA202S1R MHMA302S1R MHMA402S1R

Ever order a motor on power, speed, and enclosure? PO says maybe "5 hp, 1,800 rpm, TEFC."

New-motor nameplate says "HP 5, RPM 1748, Enclosure TEFC, Des B, Frame 184T, Amps 7.0, PH 3, HZ 60, Duty Cont, Volts 460, Type P, Amb 40 C, SF 1.15, INS CL F, EFF 82.5, P.F. 80, DE bearing 35BC02JGG30A26, ODE bearing 3OBC02JGG3OA26."

Should you reject the motor because it is not rated at 1,800 rpm? What does all that extra information on the nameplate mean? Do you care? The answers are "maybe," "we'll discuss it in a minute," and "you probably should."

To define the basic performance and mounting parameters of a motor, the National Electrical Manufacturers Association (NEMA) defines some basic design and dimensional parameters in NEMA Standard MG 1. These parameters are then coded onto the motor nameplate to give you a basic definition of what you have received. Manufacturers often include additional information to further define some key motor features.

Section MG 1-10.40, "Nameplate Marking for Medium Single-Phase and Polyphase Induction Motors," of the NEMA standard requires that "The following minimum amount of information shall be given on all nameplates of single-phase and polyphase induction motors. For abbreviations, see MG 1-1.80."

1. Manufacturer's type and frame designation
2. Horsepower output.
3. Time rating. (See MG 1-10.36.)
4. Maximum ambient temperature for which motor is designed. (See Note I of MG 1-12.43.)
5. Insulation system designation.
6. RPM at rated load.
7. Frequency.
8. Number of phases.
9. Rated load current.
10. Voltage.
11. Code letter for locked rotor kVA. (See MG 1-10.37.)
12. Design letter for medium motors. (See MG 1-1.16.)
13. NEMA nominal efficiency when required by MG 1- 12.55
14. Service factor if other than 1.0.