experience with pm motors
TRANSCRIPT
Motores | Automação | Energia | Tintas
Experience with PM motors
Carlos E. G. Martins – [email protected] Research and Technological Innovation Department - WEG Motores Rua Venâncio da Silva Porto, 399 - Malote 41 89252-230 - Jaraguá do Sul - SC, Brasil
4th International Motor Summit 2012 – Zurich, 5 December
4th International Motor Summit 2012 – Zurich, 5 December 2
Summary
Introduction
Applications for Permanent Magnet Motors
Characteristics of Different Topologies
Industrial PM Motors
PM Motors for Cooling Tower
PM Motors for Electric Vehicle
PM Motors for Compressor
PM Motor for Textile Industry
PM Motor for Extrusion Machine
Conclusions
4th International Motor Summit 2012 – Zurich, 5 December 3
account for up to 70% of EU electricity consumption
[1] P. Waide, C. U. Brunner, “Energy-Efficiency Policy Opportunities for Electric Motor-Driven Systems”, International Energy Agency (IEA), 2011.
Electric motor-driven systems
[1]
[1]
the single largest electrical end-use.
account for up to 46% of all global electricity consumption
Introduction
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[2] A. T. de Almeida, F. J. T. E. Ferreira, D. Both, “Technical and Economical Considerations in the Application of Variable-Speed Drives With Electric Motor Systems”, IEEE Transactions on Industry Applications, Vol. 41, No. 1, Jan/Feb 2005.
[2] Variable-speed
drives
offer significant energy saving potential
PM motors increase energy savings, mainly
below rated speed
Induction motors
the most used drives in industry
robustness, reliability, simple operation
Introduction
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PM motors have a significant higher efficiency in low speeds than the Induction motors.
One frame size smaller than induction motors: up to 43% reduction in volume and 35% in weight.
Do not need forced ventilaton, nor over sizing for constant torque operation.
Introduction
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Pumps, elevators, compressors, blowers, extruders, generators, electric vehicles, servodrives, household appliances.
Applications for Permanent Magnet Motors
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External rotor: high-torque, low-speed applications (i.e. washing machine, elevators), ventilation.
Characteristics of Different Topologies
Surface magnets: low-speed applications (i.e. ventilation, exhaustion, residential pumps, elevators).
Interior magnets: low and high-speed applications (i.e. blowers, compressors, pumps, elevators, electric vehicles).
Line-start: low-speed, low-inertia applications, direct-on-line connection (i.e. small fans, pumps)
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Rare-earth PMs
Output: 1.1 – 315 kW
Frames: 80 – 315S/M
Rated speeds: 1500 and 3000 rpm
Super Premium Efficiency
One frame size smaller than induction motor
Same inverter as for induction motor (sensorless control)
Applications: compressors, blowers, pumps
Wmagnet Drive System (IPM Motor) Industrial PM Motors
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Direct-online starting
Output: 0.37 – 7.5 kW
4 and 6 poles
Frames: 80 – 132M/L
Specially designed aluminum cage and rare-earth PMs
Super Premium Efficiency
Same power/frame as for induction motor
Applications: low-inertia loads
WQuattro (Line-Start PM Motor) Industrial PM Motors
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Output: 0.8 Nm – 40 Nm
Speed: 2000 – 6000 rpm
Rare-earth surface magnets
Sinewave drive
High dynamic performance, speed and position precision
Applications: robotics, winding machines, textile machines, positioning systems, packing machines, lathes.
Servomotors Industrial PM Motors
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Rare-earth PMs
Direct-drive: eliminates gear-boxes less maintenance and less mechanical losses
High-torque, low-speed motor
Drive with sensorless control
Power: 15 kW – 150 kW
Torques: 500 – 10000 NM
Speeds: 100 – 300 rpm
Frames: 355 – 450
Short axial dimension frames
Example of a 45kW, 200rpm, 2150Nm cooling tower motor.
PM Motors for Cooling Tower
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Rare-earth PMs
Rated Power: 21 kW
Base speed: 3600 rpm
Maximum speed: 10000 rpm
Water cooled
PM Motors for Electric Vehicle
Water-cooled PM motor
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200 hp screw compressor
New PM motor: 150 kW, 3600 rpm, IEC frame 250 S/M.
Previous induction motor: 150 kW, 2 poles, IEC frame 280 S/M.
Significant increase in compressor efficiency.
PM motor is one frame size smaller: reduced weight and volume.
PM Motors for Compressor
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Application: yarn starching machine
Previous motor: ring induction motor, 15 kW, IEC frame 160M.
New PM motor: 15 kW, IEC frame 132S.
Significant increase in efficiency.
Enhanced process due to constant torque x speed.
Reduced maintenance costs and shutdown hours of the machine.
PM Motors for Textile Industry
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Previous motor: DC motor.
Reduced maintenance costs.
Smaller size of motor.
21% annual energy savings.
PM Motors for Extrusion Machine
DC motor
WMagnet PM motor
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PM motors have higher efficiency than induction motors: significant reduction in energy consumption.
Variable speed applications: PM motors are even more advantageous, because they do not need forced ventilation nor over sizing for constant torque operation.
Rare-earth PM motors are usually one frame size smaller than the induction motor counterparts.
This leads to a reduced volume and weight, and lower noise and vibration levels.
Since PM motors have no Joule losses in the rotor, bearing temperature is lower, and life time is increased.
Conclusions
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Thank you!
Carlos E. G. Martins – [email protected] Research and Technological Innovation Department - WEG Motores Rua Venâncio da Silva Porto, 399 - Malote 41 89252-230 - Jaraguá do Sul - SC, Brasil