0.75 kW 1500 RPM Three Phase Motor – Buying to a Drawing for Machine Builders

A machine builder does not buy a motor, it buys a dimension. At 0.75 kW, roughly 1 HP, the electrical side of the decision is settled in a minute; what takes the time is the shaft diameter, the flange the gearbox expects, where the terminal box has to face, and whether the same part will still be available for the hundredth machine in the series.

That is the difference between an enquiry for one motor and an enquiry for a build programme. Anyone asking about 0.75 kW 1500 RPM electric motor prices for a production run is really asking about repeatability: the same reference, the same dimensions and the same lead time, order after order.

DRG Motor supplies the 0.75 kW four-pole three-phase machine at 380–400 V, 50 Hz to IEC dimensions, and makes the shaft, flange and terminal box to the drawing where the standard part will not sit. What follows is written for the drawing, not for the catalogue.

The Dimensions That Decide the Order

A 0.75 kW four-pole machine near 1500 RPM is mechanically interchangeable across suppliers only as far as the IEC frame goes. Shaft length, keyway, flange pitch circle and terminal box orientation are where two motors of identical rating stop being interchangeable, and where a machine that was designed around one of them will not accept the other.

Fixing those four dimensions in the drawing before the first prototype is what keeps the twentieth machine identical to the first.

Machines the 0.75 kW Frame Is Designed Into

At this rating the motor is almost always an internal component of an assembled machine rather than a free-standing drive.

It is designed into:

  • Packaging and cartoning machines
  • Labelling and coding heads
  • Filling and dosing units
  • Small extruder take-off drives
  • Bench and pedestal machine tools
  • Woodworking feed units
  • Textile winding and creel drives
  • Roller and modular belt conveyors
  • Screw feeders and augers
  • Batch mixers and stirrers
  • Food processing and dough equipment
  • Bottling and rinsing lines
  • Sorting and inspection conveyors
  • Pump skids and pressure sets
  • Ventilation and air handling assemblies
  • Cleaning and washing machinery
  • Agricultural and feed machinery
  • Test rigs and pilot plant equipment
  • Palletising and handling cells
  • Automation modules built in series

In every one of those, the motor is ordered against a bill of materials, so the specification has to be written once and then repeated without drift.

What Goes on the Purchase Specification

A complete 0.75 kW line on a bill of materials names the mechanical interface as tightly as the electrical rating.

It should state:

  • Rating, pole count and supply, as 0.75 kW, four-pole, 380–400 V, 50 Hz
  • Mounting as B3, B5 or B35, with the flange designation
  • Shaft diameter, shaft length and keyway dimensions
  • Flange pitch circle and spigot dimensions
  • Terminal box orientation relative to the feet
  • Cable entry size and gland thread
  • Frame material, aluminium or cast iron
  • Protection class, IP55 or higher where specified
  • Efficiency class, IE3 or IE4
  • Winding sensors or thermal protection where fitted

Written that way, the line can be re-ordered by a purchasing department that has never seen the machine.

What Moves 0.75 kW 1500 RPM Electric Motor Prices

For a build programme the price is set as much by how standard the part is as by the rating itself.

The variables are:

  • IE3 Premium Efficiency or IE4 Super Premium Efficiency
  • Standard IEC dimensions or a shaft and flange made to drawing
  • Aluminium or cast iron frame
  • IP55 as standard, or a higher protection class
  • Class F insulation
  • B3, B5 or B35 mounting
  • Batch size and the call-off schedule behind it
  • Terminal box orientation and cable entry variant
  • 100% copper windings
  • Sensors, brake or encoder fitted at the works
  • Special paint or labelling for your product
  • Stock position against your build dates
  • Packing suited to your assembly line
  • Raw material and market conditions

A part held to a fixed drawing is quoted once and then repeated, which is worth more to a build programme than a lower figure on a single unit.

Technical Specifications

The 0.75 kW three-phase machine is built to IEC dimensions and to the interface stated on your drawing.

Standard Technical Features

  • Rated Output: 0.75 kW
  • Approximate Power: 1 HP
  • Rated Speed: 1500 RPM
  • Four-pole induction motor
  • Three-phase operation
  • Operating Voltage: 380–400 V
  • Frequency: 50 Hz
  • IE3 Premium Efficiency
  • Optional IE4 Super Premium Efficiency
  • 100% copper windings
  • Cast iron or aluminum housing options
  • IP55 protection class
  • Class F insulation
  • Precision-balanced rotor
  • Low vibration design
  • Quiet operation
  • Long-life industrial bearings
  • Continuous-duty operation
  • IEC-compliant construction
  • Available in B3, B5, and B35 mounting configurations

Efficiency Class in a Machine You Sell

On a machine sold to somebody else, the efficiency class is not only your cost — it is your customer's running cost, and increasingly a line in their own specification.

Specifying IE3 or IE4 in the build gives:

  • Lower current draw declared on your machine's rating plate
  • A smaller supply and protection requirement for the installer
  • Less heat rejected inside your machine's enclosure
  • Cooler windings and longer life in the field
  • Fewer warranty interventions on thermal faults
  • Compliance where the end customer specifies a minimum class
  • A lower running cost you can quote against a competitor
  • A specification that will still be acceptable in a few years

The class chosen in the design office is the one your customer pays for every hour the machine runs.

Built for a Series, Not a Sample

A motor going into machines built in series has to be the same machine each time, and that is a manufacturing question rather than a catalogue one.

What that requires:

  • Dimensions held to the agreed drawing across batches
  • Rotor balanced at the works for consistent vibration
  • Copper windings to one specification, batch to batch
  • Bearings and grease to a fixed reference
  • IP55 frame and gasket integrity checked before dispatch
  • Nameplate data and part reference unchanged between orders
  • Traceability from the delivery note back to the batch

That consistency is what lets your assembly line treat the motor as a fixed component.

Supplying a Build Programme

Series supply is planned rather than quoted item by item, and the plan is what keeps your line fed.

How we work with machine builders:

  • Price agreed against a fixed drawing and batch size
  • One part reference carried across all orders
  • Call-off deliveries scheduled to your build plan
  • Shaft, flange and terminal box made to your interface
  • Sensors and options fitted before dispatch, not on your line
  • IE3 and IE4 quoted side by side for your specification
  • Sample unit supplied for fit before the batch is released
  • Common ratings held in stock against schedule changes
  • Technical support during the design of the drive
  • Spares on the same reference for the life of your machine

Specifying the 0.75 kW Frame with DRG Motor

Send the drawing rather than the rating. With the shaft, flange, terminal box orientation and batch size in front of us, the 0.75 kW 1500 RPM three-phase motor can be quoted as a repeatable part number instead of a one-off line.

The machines are built with 100% copper windings, aluminium or cast iron frames, IP55 protection, Class F insulation and IEC dimensions, in IE3 and IE4 efficiency classes.

Send your interface drawing and the yearly quantity, and we return a dated price for the 0.75 kW frame together with the lead time your build plan needs.