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Jackson Research
 
IntelligentMagnetics™ Motion Control
Industrial/Aerospace/Military Specifications
Designs by the inventor of the Slotless Wide Airgap Motor
Permanent Magnet Motors
EC Motors

We offer EC Motors, both physical and Virtual Prototypes, which includes 3D printed slotless (Wide Airgap) BLDC motors, slotless permanent magnet BLDC motors, and traditional torque motors of the BLDC type with a complete range of electronic controls/drivers. Although, we now prefer to supply "apps" that embody Virtual Prototypes which allow modist tailoring of the design characteristcs for applications adjustments without expensive modification and retooling of physical machines. The Virtual Prototype represents a huge investment savings over machined physical devices.

Jackson Research EC motors meet or exceed EU Commission Regulation (EC) No 640/2009 regarding ecodesign requirements.
1kW EC Motor
Slotless Motors 1kW EC Motor
Transverse Flux Machines
Transverse Flux Machines

Transverse Flux motors and generators are the object of considerable alternate energy research. One of the newest incarnations is an inside out version which only achieves approximately 50% of its potential and suffers complete demagnetization. Jackson Research has developed and constructed machines that overcome those deficiencies achieving efficiencies over 90%. These inside out machines are proprietary.

Transverse Flux Machine
Embedded Motion Controls
Integrated Control DriverEC Motor Control

We use sensored drives exclusively to achieve continuous stall torque. And, it is the only means to achieve precision profiling. The computer on a chip and proprietary PID closed loop operation coupled with precision optical encoders or our proprietary resolver technology provides the ultimate in precision motion and positioning.

EC Motion ControlsKW Motion Control System
     
Permanent Magnet Solid State Encoders / Synchros / Resolvers
Encoders

Jackson Research encoder technologies are interchangeable devices with choices of pole counts and shaft hole sizes. They can be furnished in several grades of precision. All units are designed for harsh environments. Specialized permanent magnets provide stable accurate reliable operation over the entire temperature range. Simple encoder winding alignment during assembly is achieved by rotation of the encoder housing with the encoder magnet fixed to the shaft.

Features include:

  • Phase Angle Resolution to +/- 0.01 Degrees
  • Typical Bandwidths to 10KHz
  • Interchangeable Housings
  • Neutralized Flutter
  • Thermally compensated
  • Near and Far Field Shielding
  • Submersible

These proprietary devices are fully solid state. No sine wave inputs are necessary. Demodulation is no longer required. All Synchro/Resolvers outputs are pure sine waves in real time. Any latency or phase delays are within the device resolution and are not measureable.

Resolution
Resolution can never be better than the A/D converters used in the DSP MCU.
Resolution
N in Bits
2N
LSB as % of
Full Scale
Degrees
per Bit
Minutes
per Bit
Radians
per Bit
8
256 
0.39062500
1.4062500
84.37500 
0.02454369
9
512 
0.19531250
0.7031250
42.18750 
0.01227185
10
1,024 
0.09765625
0.3515625
21.09375 
0.00613592
11
2,048 
0.04882813
0.1757813
10.54688 
0.00306796
12
4,096 
0.02441406
0.0878906
5.27344 
0.00153398
13
8,192 
0.01220703
0.0439453
2.63682 
0.00076699
14
16,384 
0.00610352
0.0219727
1.31836 
0.00038350
15
32,768 
0.00305176
0.0109863
0.65918 
0.00019175
16
65,536 
0.00152588
0.0054932
0.32959 
0.00009587
PID
PID Controls While PID controllers are applicable to many control problems, and often perform satisfactorily without any improvements or even tuning, they can perform poorly in some applications, and do not in general provide optimal control. The fundamental difficulty with PID control is that it is a feedback system, with constant parameters, and no direct knowledge of the process, and thus overall performance is reactive and a compromise – while PID control is the best controller with no model of the process, better performance can be obtained by incorporating a model of the process.
Typical Configurations
The control system performance can be improved by combining the feedback (or closed-loop) control of a PID controller with feed-forward (or open-loop) control. Knowledge about the system (such as the desired acceleration and inertia) can be fed forward and combined with the PID output to improve the overall system performance. The feed-forward value alone can often provide the major portion of the controller output. The PID controller can be used primarily to respond to whatever difference or error remains between the setpoint (SP) and the actual value of the process variable (PV). Since the feed-forward output is not affected by the process feedback, it can never cause the control system to oscillate, thus improving the system response and stability.
Motion Profile
The combination of a motion controller, drive and actuator is called an axis. When there is more than one drive and actuator the system is said to have multiple axes. Complex motion control systems such as computer controlled milling machines (CNC) and robots have 3 to 6 axes which must be moved in coordination.

Moving a system from one steady position to another (point-to-point motion) following the fastest possible motion within an allowed maximum value for speed, acceleration, and jerk, will result in a third-order motion profile as illustrated in this image:

The motion profile consists of up to 7 segments defined by the following:

  1. acceleration build-up, with maximum positive jerk
  2. constant acceleration (zero jerk)
  3. acceleration ramp-down, approaching the desired maximum velocity, with maximum negative jerk
  4. constant speed (zero jerk, zero acceleration)
  5. deceleration build-up, approaching the desired deceleration, with maximum negative jerk
  6. constant deceleration (zero jerk)
  7. deceleration ramp-down, approaching the desired position at zero velocity, with maximum positive jerk

If the initial and final positions are sufficiently close together, the maximum acceleration or maximum velocity may never be reached.

Motion Profiler
References
  1. "Testing a Low-Influence Spindle Drive Motor, L.C. Hale", T.A. Wulff, J.C. Sedgewick, Lawrence Livermore National Laboratory, UCRL-JRNL-200853, March 5, 2004.