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How to decipher a single-phase electric motor nameplate

An electric motor nameplate contains information to help users and installers match it to an appropriate application.

The information on a nameplate varies between motor types, so we’ve prepared this guide to help you know what to look out for.

In this example, we’ll examine the nameplate on a typical Gibbons single-phase squirrel cage induction motor.

TYPE

  • MY - These initial letter(s) are specific to the manufacturer.
  • 80 - The first numbers denote frame size (the distance (mm) from beneath the feet to the middle of the shaft). This usually starts at 56 and may rise to 450.
  • 2 - The next digit refers to lamination pack length (1 being the shortest). Pack length is usually 1, 2 or 3, with some manufacturers employing a numerical system while others prefer letters. 
  • Following these numbers there may be a letter (M, L or S) denoting foot length fixings – i.e. medium, long or short.
  • 4 – This last digit refers to pole speed – normally two, four, six or eight.

HP

This is the rated horsepower. One horsepower is equal to 746 watts.

kW

The motor’s rated output in kilowatts.

V

The motor’s rated voltage.

A

The full-load current, stated in amps.

Hz

This is the frequency, which is 50 Hz in Britain and Europe, while some countries in Asia and the Americas use 60 Hz.

r/min

The motor’s shaft speed in revolutions per minute.

IP

The motor must be protected from the intrusion of objects, dust particles and moisture. The level of protection is determined by an ingress protection rating, with the two digits representing protection against the entry of solid objects and moisture respectively.

INS. CL

This refers to the motor’s insulation class, denoting resistance to thermal failure. The rating is typically set at F, which covers temperatures up to 155°C, although motors can be rated H (maximum 180°C).

µF/V

These symbols represent capacitor rating in microfarads (µF) and volts (V).

S1

This section indicates the motor’s duty cycle rating in accordance with International Standard IEC 60034-1. This extends from S1 to S10 (S1 means continuous duty, with S2-S10 representing shorter duties).

No.

This is the manufacturer’s serial or reference number. This allows the firm that built the motor to diagnose faults and supply a suitable replacement.

For all electric motor sales and technical enquiries, give Paul Scott a call on 01621 868138 or email paul@gibbonsgroup.co.uk.

Electric Motors

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