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Understanding Motor Codes!

Replacing a small AC gear reduction motor? Its quite easy to decipher codes from one brand/manufacturer to another for easy replacement! Just use these manufacturer product codes supplied here!

If you know the code of the motor already, you can simply use the search (enter either a full or partial model number) on the website to be taken to the appropriate pages to be shown suitable replacement motors.

Lets get started!

All you have to remember is that EVERY standard motor is a copy of Oriental in one form or another, so they will either use a similar coding system to Oriental or very similar, but they will ALL have the same features, even though their coding system may be very different.

Frame size, these will always be available in 60,70,80,90,100mm. (70mm and 100mm are uncommon)

Motor type, Induction, Reversible, Speed Control, Terminal Box, Electromagnetic Brake or Speed Control + Brake

Wattage from 6w-200w (6w-120w is more common)

Output on motor or gearbox, can be a geared pinion shaft, keyed shaft, D-Cut or Straight shaft.

Voltage, ranges from 110v-415v Single and three Phase (110 volt is American, rarely seen here in Australia)

Speed control and electromagnetic brake are easy to spot because they are a modular add-on to the back of the motor. For example:

Oriental Motor Company Speed Control Motor

Straight away, we can see what it is, one because of the label and secondly because we can see the obvious tacho stuck to the rear of the motor. This is nice and new so it's easy to see the label, but the label tends to fall off under certain working environments (especially around food processing plants).
Even if it didn't have a label, we know its a 60mm speed control between 6w-15w.

Say we want a 90mm frame, 90w Lead Wire Induction motor with a geared output shaft 220-240V Single Phase

For Oriental it will be: 5 (Frame Size) I (Induction)K (Motor Series) 90 (Wattage) GU (Pinion shaft to suit GU gearbox) -CW (Voltage)

For SPG it will be : S(Motor Series) 9 (90mm) I (Induction) 90 (Wattage) G(Gear output) X (Voltage) H  (Heavy Impact - hardened shaft)

Notice the pattern? FRAME, MOTOR TYPE, WATTAGE, GEARBOX, VOLTAGE! Very easy to understand once you know what to look for.
Thinking like this will enable you to read and better understand codes you are not familiar with, while the frame size of the motor, the output shaft size and wiring all give clues to an unmarked motor making them much easier to identify.

Heavy or Light impact shafts: The difference? A Light impact shaft means the output shaft of the motor is made of a soft metal. It runs quieter than a heavy impact shaft which has pinion shaft chemically or heat treated to be hardened. The advantage is the transmission noise is greatly reduced, the disadvantage however is that the shaft and gearbox wear at a faster rate and if a shock reverberates back through the gearbox the pinion shaft can be easily damaged. Most motors you will come across are hardened types. 

The GN/GU (KB/KC in SPG) gearboxes -: GN usually refers to the lightweight gearbox, whereas GU is the heavy duty type gearbox.GU will generally start at 60 Watts and go through to 140w depending on the manufacturer and the type of materials used in the build process. A 90mm GN gearbox is not as strong as a 90mm GU gearbox which offers double the torque capability, from 9Nm to 19Nm.  

Torque Motor ? This is a motor that generates huge torque at startup and as the speed of the motor increases the torque of the motor gradually drops off. These are used for low speed/high torque requirements or locked rotor starting. They also use a different type of gearbox that is able to withstand much higher radial and thrust loads. Very uncommon and very expensive.

Standard Motor Manufacturers

Oriental, JAPAN

The Japanese 'father' of them all. This company invented the original "Standard" motor.
Exceptional High Quality though very expensive here in Australia. Still one of the only companies to offer a full waterproof motor in this range.

Oriental Motor Company Product Model numbering SYstem


A Korean copy of the Oriental Motor. Overall, a solid product with a good range at a decent price. The Sumitomo Astero (made to Japanese precision standards), is what you would class as the high end version of this motor.

Spg Motor Product Decoder

Sumitomo Astero, KOREA

Made by SPG (Korea) but to Sumitomos high Japanese precision standards. It is a much higher quality unit than the standard SPG motor.
It's not a common product by any means. It's available in Australia from Sumitomo though its not actually stocked here and must be ordered in.

Sumitomo Astero Coding System

Sesame Motor Corp, TAIWAN

Taiwanese copy of the Oriental motor (Even has a similar coding system!). Good quality and a super strong range.
Used to be quite a few of these around though rare now because of the expensive price tag.

Sesame Motor Catalogue Coding System

Panasonic, JAPAN

Japanese Oriental copy. Good Quality. Rare outside of Japan. Only seen in Australia nowadays on specialised Panasonic equipment.

Panasonic Fractional Horsepower Motor Coding System


Taiwanese copy of the Oriental motor (Even has a similar coding system!). Good quality and a good range.


GPG Motors, Need a Replacement for a SPG, Oriental Motor, Bison Motor, Sesame Motor or Panasonic Motor?

Bison, USA

Extremely high quality motors with the most extensive range you can currently buy. Not as cheap as others here, but when you buy a Bison motor you know you get what you pay for.

T.W.T, Taiwan

T.W.T (Tung Way Team Electrical Industry) are a popular series throughout most of Asia (including China, Hong Kong, Vietnam, Korea etc)
Extremely well built with exceptional precision.
Like all Taiwanese products, it's expensive.

PeeiMoger, Taiwan

Not common here, But a popular series throughout most of Asia (including China, Hong Kong, Vietnam, Korea etc)

As you can see, most of the coding systems are very similar to Oriental, except for Panasonic, SPG and Astero. By using these charts (which all follow the same system) you'll find it easy to decipher random codes that manufacturers tend to use.