Imperial 56 Frame Motors

Crompton Greaves motors have been distributed in Australia by Royce Cross Agencies for 25 years.

The company's operations involve manufacturing; FHF (fractional HorsePower) Motors for domestic, commercial, agricultural and industrial applications have been manufactured since 1937 and today claim a premier market position.

The state-of-the-an manufacturing and test facilities, comparable to the best in the world, are certified to ISO 9001 standards by BVOI of England and are approved under the Category Certification Program of CSA, Canada. FHP motors carry the CSA-NRTUC Mark for Canada and the USA. The motors have been tested to comply with the European Union's Electro Magnetic Compatibility Directive and the Low Voltage Directive; and the CE mark, as legally required in Europe.

The design and construction of this range of motors is essentially that of the basic induction motor, but with refinements introduced to meet specific market requirements. Due to the need to be lightweight for applications mainly in domestic/light industrial equipment, they are of rolled steel shell construction, with die-cast aluminium end shields. This form of construction also lends itself to economic production in the large numbers, required for these types of motor.

Standards

These motors conform to 85 5000 Part II for performance. Dimensionally, motors in Frame 56 conform to BS 2048 Part I, while Frame IOOS conforms to IEC.

Rating

All standard motors are continuously rated to comply with performance standards.

Enclosures

The various types of enclosures are as follows:

Drip Proof (DP) to 1P23
Totally Enclosed Fan Cooled (TEFC) to IP44

Construction

Rolled steel shell with die cast aluminium end shields.
Polypropylene fan with steel fan cowl.
Pressed metal base.
Die cast aluminium terminal box and fabricated baker light terminal block.

Bearings

All motors are with ball bearings employs double shielded I sealed bearings greased for life. The bearing housings are fine bored to precision dimensions on precision boring machines. The shafts have excellent surface finish closely ground on the most advanced grinding machines. This ensures close tolerances and a high degree of concentricity leading to correct bearing fits for extended bearing life.

Terminal Arrangement

Terminals are housed in Terminal Boxes suitable for conduit or for open wiring, if preferred. Motor cables are colour coded to BS standards and terminals are marked for identification and reconnection. A terminal diagram is attached to each motor for convenience.

Rotation

The single phase, FHP motors are supplied, as standard, connected for clockwise rotation viewed from the driving end, unless specified otherwise. Reversal of the starting winding leads at the motor terminal board will reverse rotation of all types.

Capacitors

These are electrolytic short-time rated capacitors used on capacitor-start models, usually mounted on the motor frame. Special consideration is required if there are extremes in ambient temperature.
Electrolytic capacitors will not deteriorate long periods without operation. Hence they normally should be reactivated by switching the motor on and off.

Overload Thermatrips

All models come with manual reset overload protection as standard.

Reliability

Each component goes through rigorous quality control at every stage of manufacture. With well-equipped material testing laboratories to back up the modern manufacturing process, the final product is a highly reliable motor.
All models are complete with manual reset overload protection as standard (except for 2.2B4C).

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