Key Challenges in Industrial Drive Technology
Positioning in demanding work environments
A common challenge in industrial environments is the reliability of motors, especially in vibration-prone and demanding work areas. Positioning is carried out using encoders and additional sensors, which are susceptible to contamination and can therefore lead to increased failure rates.
Precise positioning guarantees large price hurdles
The precise positioning of drive systems often represents a significant cost peak, especially when sophisticated servomotors come into play. Although these offer the desired accuracy, they are associated with high investment costs. Companies are therefore faced with the challenge of balancing precision and cost.
Increasing demands on energy efficiency
The increasing requirements for energy efficiency due to stricter European standards present companies with new challenges. Achieving the IE5 efficiency class presents companies with additional regulatory and operational hurdles.
Our solution: A new, patented motor without encoder with matching frequency converter.
The patented and innovative EM-A series from Mitsubishi Electric forms the bridge between a servo motor and an induction motor. Compared to conventional servo motors, the EM-A motor offers good performance in speed and position control, but without the use of an encoder. With up to 50 % space and weight savings compared to induction motors and a price advantage over servo motors, the EM-A series is a cost-effective solution that is particularly suitable for applications where performance and efficiency are required. The absence of an encoder and sensor makes it ideal for use in dirty production environments.
The motor is ideally complemented by a frequency converter from the FR-E800 series.
What are the advantages of our patented EM-A series?
Energy efficiency
The EM-A series achieves the highest energy efficiency class IE5, resulting in significant savings in energy consumption. This efficiency is the result of an optimized motor design and an innovative sensorless control system that enables precise performance without additional sensors. This reduces system complexity and lowers maintenance costs.
Thanks to these advanced features, the EM-A motor makes a decisive contribution to reducing operating costs and minimizing CO₂ emissions. Companies looking for sustainable solutions and long-term cost efficiency will find the EM-A series to be the optimal choice.
Space and weight saving
The EM-A motor is up to 50 % more compact and lighter than conventional induction motors. This space-saving design allows for more flexible installations, especially in applications with limited space.
The reduced size allows companies to design their machines more efficiently and utilize valuable space. The reduced weight also makes transportation and installation easier, saving time and money. The EM-A motor is therefore the ideal solution for companies that want to combine space savings and high performance in their production processes.
High performance
The EM-A series offers precise speed and position control without an encoder. The motor achieves a positioning accuracy of 1.8° in positioning mode (with a virtual encoder resolution of 4,096 pulses per revolution and a deviation of ±0.05%) and a maximum torque of 200%.
A special feature of the patented motor series is the absence of an encoder or sensor. Among other things, this means that the motors can be used in dirty working environments without any problems.
This combination of high performance and precise control makes the EM-A series the ideal solution for companies that place the highest demands on their drive technology, while reducing maintenance and installation costs.
Technology: Unique motor type - encoderless permanent magnet motor
The EM-A series from Mitsubishi Electric is patented and innovative on the market. It combines a permanent magnet motor without an encoder with an optimally tuned frequency converter. The rotor consists of a salient-pole core (patented) and a surface-mounted permanent magnet, which is why the motor inductance changes depending on the rotational position. This change in inductance is used for sensorless control.
Product overview
The EM-A series from Mitsubishi Electric presents an innovative solution that combines the advantages of a highly efficient permanent magnet motor with the optimally matched FR-E800 frequency converter.
EM-A Series include newly developed permanent magnet motors using the patented salient-pole core.
The rotor consists of the salient-pole core and surface-mounted permanent magnet, and therefore the motor inductance changes depending on the rotational position.
Designed to save energy, reduce footprint, and minimize cost with advances in quality, performance, and maintenance capabilities.
More information to download
FAQ
What is the main advantage of a permanent magnet motor compared to a conventional three-phase asynchronous motor?
The main advantage of a permanent magnet motor (PM motor) over a three-phase asynchronous motor is its higher efficiency, particularly in the partial load range. The magnets in the rotor mean that there is no current flow to generate the rotor field - this significantly reduces copper losses and heat generation.
As a result, the permanent magnet motor is more energy-efficient (often up to efficiency class IE5), lighter and smaller with the same power and can be controlled more precisely, e.g. in applications with variable speed control or in positioning without an encoder.
What are the main differences between a permanent magnet motor and a reluctance motor?
A permanent magnet motor generates its magnetic field using magnets in the rotor. This magnetic field synchronises with the rotating field in the stator, resulting in high torque density, precise controllability and very high efficiency - even in the partial load range.
A synchronous reluctance motor (SynRM), on the other hand, has no magnets. The magnetic field is generated solely in the stator and the rotor is aligned with the course of the magnetic resistance (reluctance). This makes the motor more robust and cost-effective - but with slightly lower dynamics and torque density.
Where are permanent magnet motors used?
Permanent magnet motors are used wherever high energy efficiency and precise control are important. In industry, for example, they drive servo systems, robots and machine tools. They are also frequently used in electric cars, pumps, fans and compressors. Their compact design and low energy consumption also make them ideal for household appliances and modern HVAC systems.
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