Issues with current lims?

• 30min as many articles you can find, make a big list & draw connections w them after)
• Issues
• find stats

Things to optimize for

• speed
• clean motion
• low power input

How does it work?

• generates linear motion of a load instead of rotation
• Stator: made from a series of coils arranged in a line, powered by AC, thus creating a magnetic field.
• Rotor: Metal core w a series of conductive elements like metal plates/tubes embedded
• 2 magnetic fields form push in a linear motion: stator coils are powered, they create a varying magnetic field that induces an electrical current in the conductive elements of the rotor. This current creates its own magnetic field, which interacts with the magnetic field of the stator.The interaction between these two magnetic fields causes the rotor to move along the stator, resulting in linear motion. The speed and direction of this motion can be controlled by adjusting the frequency and phase of the current supplied to the stator coils

Pros and cons?

Pros

no magnetic attraction forces during assembly, long travel, high cont. force & acceleration ratings

• good for rapid movement of large payloads
• simple construction
• good weight-to-power ratio
• low cost (no rotating parts)
• no speed limitation since no centrifugal force
• tractive effort doesn’t depend on speed
• no magnetic attraction during assembly since no permanent magnets (simplifying tasks)
• suited for long travel lengths
• ideal for heavy-duty apps

Cons

complex, make big attractive forces, really big, less efficient than other linear motor techs

• Poor efficiency
  • Lower power factor
    • air gap thing
  • Air gap is bigger than induction motor & large magnetizing current is made
  • very high speed (more heat losses)
  • very low speeds
  • Poor energy efficiency: High power consumption. less efficient than perm magnet linear motors = more heat for a given cont. force output = more forced air/water cooling
  • less efficient due to “end effects” (reduces effectiveness of 1st 1-2 pole spans
  • permanent magnet LIMs are lower & produce heat, need water-cooling equipment
• No force @ standstill, unless AC vector drive is used
• Maintaining control in dynamic environments is hard - need advanced control systems
  • complex systems, sophisticated control algorithms than perm magnet motors
  • complex, intricate construction & cost as a result
  • high cost of rail fixed on track centerline
• Bulky size & weight (limit design & operations). compared to perm magnet motors, lims are big for a given cont. force rating
  • greater package size from higher physical scale
  • retrofitting existing infrastructure w lims
• EM interference - lim interferes w electronics, need shielding
• large attractive forces during op, no perm magnets but still have large attractive forces during op.
  • must be supported by bearings & structure, affect system life

Applications

• traction motor
• metallic belt conveyors
• sliding doors
• high-medium speed vehicles
• shunting for railway yards
• EM pumps

LEARN

• talk about most of the possible applications
  • energy manage
  • real-time optimized control & dynamic control (self-driving?)
  • fault detection & diagnosis & predictive maintenance (minimize maintenance)
  • simulations & design (propose solutions, etc.)
  • traffic management (can apply to buses too)
• so far

REP 1

• talk about one of these applications & code a program for a very simple many have has done

REP 2

• an application, just one or 2 people have done

Who is working on it