Download Session 9.2 J. Ritchey Improving Generators and Motors Using

Session 9.2
J. Ritchey
Improving Generators and Motors Using
Dynamic Current Management
Intelligent Revolution
What’s the Problem?
Primary challenges impacting rotating
electric machines (Motor & Generator)
•
Narrow speed and torque efficiency range for
traditional electric machines.
•
Gearbox losses, failures, and maintenance
•
Power Electronics losses due to high variability
operations.
What’s the Problem?
Rotating Electric Machines Operating Characteristics
•
Only efficient at a “Rated”? What’s Rated?
•
Operating at conditions other than rated, will significantly reduces machine performance
•
Greater variability = more losses
Baldor Electric Published
Performance Curves
What’s the Current Solution?
Examples of current solutions:
•
•
•
Stabilize the Prime Mover
Advanced Power Electronics
Innovative architectures and materials - (PM)
Marginal viability for many applications
•
Wind power offers marginal economic returns relative to
traditional energy sources.
•
Electric vehicles face “range anxiety” amongst consumers,
especially marine vessel users.
•
Electric motors operating in variable applications lose billions
of dollars in energy annually.
Source: Wind Turbines Fundamentals, Technologies,
Applications & Economics" by
Erich Hau
Typical turbine gear box
Dynamic Current Management -
“DCM”
What is DCM?
Converts existing rotating machines into a multitude of different machines, all with
different operating characteristics.
Transitions between operating conditions seamlessly in real time and under load.
DCM accommodates high coil count - electronic gearing (reduction or removal of gearbox)
Provides greater control over outputs (electrical or mechanical)
- DCM Generator = Higher PE efficiencies
- DCM Motor = Improved speed & torque performance
Multi-curve efficiency
With DCM
Dynamic Current Management technology
reduces “off peak” losses, by switching generator
coils to optimize efficiency at a given speed.
DCM Benefits
DCM Reconfiguration & Right Sizing Machine Capacity
1. Dynamically assess changing input torque, RPM, and load requirements
2. Calculate optimal induction configuration and capacity for the machine
3. Adjust the machine configuration for desired outputs
DCM will asses the optimal coil configuration and
convert the machine to the most idea internal
configuration at all times
Each coil configuration functions like an entirely new
machine with a different ‘rated’ design point.
How is DCM Implemented?
Start with traditional machine (multiple coils)
Employ intelligent system controls
C1 (Baseline) – all 6 coil blocks in parallel
C2 (Combo 2) 3 parallel, 2 series in each coil
C3 (Combo 3) 2 parallel, 3 series in each
C4 (Combo 4) only 4 coil bocks, all in series
C5 (Combo 5) only 5 coil blocks, all in series
C6 (Combo 6) all 6 coil blocks in series
Modify windings
to specification
Significantly improve machine performance
Reduced losses in copper
Reduced losses in iron core
Reduced losses in magnets
Lower Heat
Machine runs cooler and more efficient
Proven Technology - Methodology / Process
INDEPENDENT PERFORMANCE TESTING
 5kW PMG is run from 0 to 1,000rpm at a fixed load, and efficiency
measures are collected
 PMG is first run in “Baseline” configuration
 The coil configuration is changed and the test is re-run across the
full range of speed
 Load is changed and the process is repeated
- Data collected for 156 combinations
Sample Data
(fixed load/ variable speed)
Efficiency Delta varies by the speed / load / torque
- at the design point, DCM offers virtually no gains
Sample Data
(fixed load/ variable speed)
Efficiency Delta varies by the speed / load / torque
- off-peak DCM offers different levels of performance gains
Sample Data
(fixed load/ variable speed)
Efficiency Delta varies by the speed / load / torque
- off-peak DCM offers different levels of performance gains
Sample Data
(fixed load/ variable speed)
Efficiency Delta varies by the speed / load / torque
- off-peak DCM offers different levels of performance gains
Sample Data
Alternate View (fixed speed / variable load)
Summary/Conclusion
DCM Technology provides significant efficiency and
performance improvements to variable generator and
motor applications
Motor
Reversible system
Generator
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Questions?
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CONFIDENTIAL