PM IE4 Motor—efficiency and reliability

Permanent Magnet (PM) motors are a key technological element in BD series screw compressors manufactured by B&D (Baldor-Tech). PM motors stand out for exceptional efficiency and performance, which translates into outstanding results for these machines.

Oil-cooled motor, used in the DHF-10PM+ model, ensures excellent heat dissipation even during intensive, continuous operation—which translates into longer service life, greater reliability, and the ability to operate in more demanding industrial conditions.

The core features and benefits of using PM motors in these compressors include:

✅ High energy efficiency (IE4 class): Using PM motors with IE4 efficiency means meeting some of the most stringent international standards on energy consumption. In practice, this results in lower electricity bills, a reduced carbon footprint, and more sustainable operation of the compressed-air installation.

✅ Precise control: PM motors allow accurate adjustment of rotational speed and torque, which is crucial in compressors for matching output to changing operating conditions. As a result, B&D series compressors run only when needed and only as intensively as the production process requires.

✅ Reduced noise and vibration: PM motors are known for low noise and vibration levels, improving user comfort and minimizing impact on the working environment.

✅ Long service life: The absence of brushes in PM motors means less maintenance and lower failure risk, extending the life of the entire compressor system.

✅ High reliability: IE4-class PM motors are robust and stable even during extended operation in demanding industrial conditions. This ensures production continuity and reduces downtime risk.

The IE4 class is not just a formal parameter—it delivers measurable energy savings, greater reliability, and a step toward modern, energy-efficient production.

Integrated inverter

Speed control using an inverter (VSD – Variable Speed Drive) enables precise control of motor speed and significantly reduces inrush current. This allows the compressor to start smoothly, without sudden load spikes on the electrical network, which translates into longer component life and overall system stability.

Key advantages of using an inverter in B&D screw compressors:

✅ Significant energy savings: A variable-speed drive matches compressor output exactly to instantaneous demand for compressed air. In practice this reduces energy losses during low-load periods, delivering savings of up to 35% compared to fixed-speed compressors.

✅ Synergy with the PM motor: Combining the inverter with a high-efficiency PM IE4 motor (permanent magnets) delivers an even higher level of efficiency—up to 42% energy savings. It is one of the most economical and eco-friendly solutions available in the compressed-air industry.

✅ Stable working pressure: The inverter eliminates pressure spikes, keeping it within a narrow tolerance band. As a result, production equipment supplied with compressed air operates stably, and the risk of downtime caused by pressure fluctuations is minimized.

✅ Reduced service costs: Smooth starts and stops limit mechanical wear on the drive and compression unit. Fewer on/off cycles also extend the life of bearings, couplings, and the motor.

✅ Lower noise and reduced vibration: Inverter operation combined with a PM motor significantly reduces noise and vibration. The compressor runs more quietly and is more comfortable for its surroundings, which is particularly important in production halls where many machines operate simultaneously.

✅ Lower load on the electrical network: Reducing inrush current eliminates negative impacts on the power supply network, which is especially important in facilities with extensive electrical infrastructure.

In B&D compressors, the inverter is not just an add-on—it is the foundation of economical, stable operation which, together with the PM IE4 motor, delivers best-in-class energy efficiency.

Control panel

The B&D controller is an advanced system for managing screw-compressor operation, responding in real time to key parameters and protecting the unit from unplanned downtime. It interfaces directly with the inverter and a set of sensors (including temperature, pressure, and flow), ensuring optimal operating conditions and full installation safety.

The clear display provides detailed information on:

✅ current alarms,

✅ temperature,

operating hours,

screw module temperature,

current operating parameters (pressure, load, speed).

The controller allows you to change the minimum and maximum pressure setpoints, configure work schedules, and manage load. Thanks to the built-in connectivity module, remote monitoring and management of the compressor over Wi-Fi is also possible, providing quick access to service data and operating parameters from anywhere.

B&D Cloud

B&D Cloud is a modern platform for remote monitoring and management of DHF series screw compressors, available exclusively through a dedicated mobile application. It enables real-time viewing of operating parameters, analysis of the unit’s operating history, and generation of energy reports.

Benefits of using B&D Cloud:

✅ Full control in the mobile app—monitor the compressor from anywhere, at any time.

✅ View of key parameters—pressure, temperature, energy consumption, and operating hours.

✅ Real-time notifications—instant information on faults, alarms, or threshold exceedances.

✅ Service planning—maintenance reminders and fault prediction to minimize downtime risk.

✅ Cost optimization—energy-use analysis and reports to increase installation efficiency.

5-year AirSure warranty

Your equipment runs continuously—make sure it stays that way.

Full service protection, genuine parts, and assured performance for years to come.

Check