IE4 – efficiency ahead of its time

Combination of AC motor’s reliability and Brushless Servomotor's performance


Permanent magnet electric motors typically use rare earth elements such as Samarium and Neodymium. The commodity price of such elements may be unstable in the future. As such, a challenge for Lafert to meet the cost stability expectation of customers by offering strategically priced products. Therefore Lafert developed and introduced an innovative, cost effective Interior Permanent Magnet Electric Motor (IPM) design that will be best positioned to enjoy a key competitive edge over the global market. The new IPM design will be launched under the name HPF.

Identifying the eventual shortcomings of standard permanent magnet electric motors that are currently available in the market, Lafert has clearly taken advantage of a unique product design to offer improved electrical efficiency at stable and reduced production costs to its customers spread across the World. Through its offer of this innovative product, Lafert has tackled the issue of the increasing cost of rare earth elements. The new sensorless, interior permanent magnet rotor design has been constructed without the use of rare earth element magnets. Lafert has thus met the critical and growing demand for cost- and energy-efficient electric motors through its introduction of the innovative Synchronous IPM IE4 motor.

Lafert’s in-house servo and AC induction motor design and manufacturing capabilities have facilitated the development of this uniquely engineered product. In order to develop the new HPF PM Motor, Lafert used a combination of electrical and mechanical product designs inspired by the brushless servo motor’s electrical design and the AC induction motor’s mechanical design. The higher efficiency over standard AC induction motors enhances the power/weight ratio of the motor, thereby allowing for significant size and weight reductions that have resulted in the development of a compact product. Lafert also places great emphasis on materials research. This has resulted in reduced dependency on rare earth magnets for designing our motors, allowing for the use of readily available permanent magnets, which ensure price and supply stability into the future.

The primary benefit offered by the HPF synchronous motor is the reduction in the lifecycle cost of the motor. The combination of servo brushless and induction motor technology used for the development of this product gives it an efficient, noiseless design. Owing to higher energy efficiency, the product dissipates lower heat, which improves its operating life. This motor is primarily targeted toward HVAC applications in pumps, fans, compressors, and blowers, where there is an ever-growing emphasis on reducing the operating cost, weight, and size of the motors. Lafert also offers flexibility in terms of design, customizing the active and mechanical part of this motor to suit specific end-user needs. Unlike most competitors, we have the ability to produce this motor in huge quantities on a regular basis with required modifications as per specific customer needs.

The HPF IPM synchronous motor is available in a wide range of power outputs, ranging from 0.55 kW to 22kW, with full flexibility in motor speed up to 6000 RPM, and it can be controlled by most standard drives. A High Performance Integrated (HPI) version of the product is also available, which includes an integrated drive control system.


- Wide power output 0.37 - 30 kW

- Compact range in IEC frames: 71 - 90 - 112 - 132 - 160

- Voltage: 3 phase 230 - 480 V

- Speed range up to 4500 RPM

- Designed for different magnetic materials to secure stable cost base

- Sensorless control or with speed transducer

- IPM design (no rare earth magnets) or SMPM design (high flux rare earth magnets) depending on the performance demand

- Controlled by most standard Drives


- Lafert offers a strong competence level to support customization

- Full flexibility regarding motor speed

- Same mechanical selection possibilities (B3, B5 etc) as in a standardized IEC range