Electromagnetic suspension system
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Electromagnetic suspension system

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this is a type active suspension system. the presentation was 1st runner up for Mahindra automobiles india lmt. competition on solution to the better suspension system for sedans. few other types have ...

this is a type active suspension system. the presentation was 1st runner up for Mahindra automobiles india lmt. competition on solution to the better suspension system for sedans. few other types have also been discussed.

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  • Sprung mass – mass of chassis and body wrt to mass of wheels and axle.. Should be low
  • The Motor Principle: when a current-carrying conductor is located in an external magnetic field perpendicular to the conductor, the conductor experiences a force perpendicular to itself and to the external magnetic field.
  • Fast response of EM coil compared to Hydraulic/pneumats. Actuate dampers within fraction of seconds.
  • We need to reduce the High cost of the Bose suspension system, so that it can be put into use by normal cost vehicles. What if we can combine the use of active and passive suspension system? This idea can yield to a modified suspension system.
  • To be able to use in a Macpherson type of system, the shape of the magnets have to be changed. The LEM of Bose system doesnt use the coil spring. It simply carves out the shape of the pothole and bump, i.e. the tire extends or withdraws according to the road surface
  • So the entire sytem would look like this.
  • Body roll- term used to describe the tilting of cars on other side of the turn taken.

Electromagnetic suspension system Electromagnetic suspension system Presentation Transcript

  • F/OEngineeringandTechnology JamiaMilliaIslamia 1
  • Mahindra Igniters Independent Suspension • Greater ride comfort, • Safer • Stable on/off road • Better traction Beam Axle Suspension • Simple in Construction • Inexpensive • Greater loading capacity • Low self weight F/OEngineeringandTechnology JamiaMilliaIslamia 2
  • Electromagnetic Suspension System Prepared by Bilal Hasan Syed 6th Semester B.Tech Mechanical Engg. Jamia Millia Islamia Mahindra Igniters Solution
  • Classification of suspension systems Suspension system Active Hydraulic Pneumatic Electro- magnetic Passive F/OEngineeringandTechnology JamiaMilliaIslamia 4
  • Hydraulic Suspension System Examples of vehicles employing this technology • BMW has recently developed an antiroll control (BMW-ARC) system by placing a hydraulic rotary actuator in the center of the antiroll bar at the rear of the vehicle as shown on figure in next slide. • Mercedes has developed an Active Body Control System, which uses high-pressure hydraulics to pre-stress the spring, hence generating antiroll forces without coupling the left and right wheels (as in the case of an antiroll bar). F/OEngineeringandTechnology JamiaMilliaIslamia 5
  • Hydraulic Suspension System F/OEngineeringandTechnology JamiaMilliaIslamia 6 Fig no. 1 ARC system of BMW using a hydraulic rotary actuator
  • Hydraulic/Pneumatic Suspension System Advantages are • Very high force density • Ease of control • Ease of Design • Commercial availability of various parts • Reliability • Commercial Maturity F/OEngineeringandTechnology JamiaMilliaIslamia 7
  • Hydraulic/Pneumatic Suspension System Disadvantages are • considered inefficient due to the required continuously pressurized system; • relatively high system time constant (pressure loss and flexible hoses); • environmental pollution due to hose leaks and ruptures, where hydraulic fluids are toxic; • mass and intractable space requirements of the total system, including supply system, even though it mainly contributes to the sprung mass. F/OEngineeringandTechnology JamiaMilliaIslamia 8
  • Electro-magnetic Suspension System Basic Idea Magnetic repulsion can be used to absorb shocks. And since response to input signals is very fast in electro-magnetic induction motors, its use can give beneficial results. Linear motion can be achieved by an electric rotary motor with a ball screw or other transducers to transform rotary motion to linear translation. However, the mechanism required to make this conversion introduces significant complications to the system. These complications include backlash and increased mass of the moving part due to connecting transducers or gears that convert rotary motion to linear motion (enabling active suspension). F/OEngineeringandTechnology JamiaMilliaIslamia 9
  • Electro-magnetic Suspension System F/OEngineeringandTechnology JamiaMilliaIslamia 10 Overcomes the disadvantages of hydro/pneumatic suspension as follows- • No need for continuous power, • Ease of control, • Absence of fluids • Relatively high Bandwidth (tens of hertz)
  • Bose Suspension System It consists of • Linear electro magnetic motors attached on each wheel, • Power amplifiers at each wheel, • A set of control algorithms. Working • This linear electromagnetic motor responds quickly enough to counter the effects of bumps and potholes while maintaining a comfortable ride. • Electrical power is delivered to the motor by a power amplifier in response to signals from the control algorithms. • The bidirectional power amplifier allows power to flow into the linear electromagnetic motor and allows power to be returned from the motor. F/OEngineeringandTechnology JamiaMilliaIslamia 11 - An application of EM suspension
  • Bose Suspension System This suspension system requires less than a third of the power of a typical vehicle’s air-conditioning system, i.e., hundreds of watts. Compared with hydraulic actuators, the main advantages of electromagnetic actuators are as follows: • Increased efficiency, • Improved dynamic behavior, • Stability improvement, • Accurate force control, • Dual operation of the actuator. F/OEngineeringandTechnology JamiaMilliaIslamia 12
  • Bose Suspension System F/OEngineeringandTechnology JamiaMilliaIslamia 13 Fig no. 2- Bose Suspension System
  • Driving through curves F/OEngineeringandTechnology JamiaMilliaIslamia 14
  • Driving through long Bumps F/OEngineeringandTechnology JamiaMilliaIslamia 15
  • Bose Suspension System The disadvantages are as follows: • Increased volume of the suspension, since the force density of the active part of hydraulics is higher than for electromagnetic actuation, i.e., system mass and volume could be less; • Relatively high current for a 12- to 14-V system; • Conventional designs that need excitation to provide a continuous force; • Higher system costs. F/OEngineeringandTechnology JamiaMilliaIslamia 16
  • Proposed Design F/OEngineeringandTechnology JamiaMilliaIslamia 17 Basic Idea To combine the use of both Active and Passive suspension. The general Macpherson system can be used and the passive shock absorber can be replaced by electromagnetic dampers. Basic Components • Electromagnetic Damper • Passive Coil Spring • Power supplier • Control Unit
  • Proposed Design General Modification For an electromagnetic coil to be used in a Macpherson type of suspension system, its shape has to be modified. F/OEngineeringandTechnology JamiaMilliaIslamia 18 F Fig no. 3 Linear Electromagnetic coil of Bose System
  • Proposed Design General Modification It has to be made into a cylindrical shape or moreover a tubular shape so that it can be adjusted in Macpherson system. F/OEngineeringandTechnology JamiaMilliaIslamia 19 F Fig no. 4 coil shape of the proposed design
  • Proposed Design F/OEngineeringandTechnology JamiaMilliaIslamia 20 Coil spring Passive damper Permanent Magnets Bump stop Encoder Shaft 3 phase Coil Coil springs Permanent magnets (A) (B) (C) Fig no. 5 Suspension struts. (a) Passive. (b) Active interior-magnet TPMA, (c) Active exterior-magnet TPMA.
  • Proposed Design Working When the vehicle moves on the road the irregularities are sensed by the control unit sensors. Power is supplied by the to EM dampers. Signals are sent to Electromagnetic dampers which extend/withdraw according to need. Wheels would then trace the path of irregularity. Entire process would take fractions of second to initiate. The extra shocks would be absorbed by the passive coil spring. Power Regeneration The bidirectional power supplies allows power to flow into the tubular electromagnetic motor and allows power to be returned from the motor. For example, when the suspension encounters a pothole, power is used to extend the motor and isolate the vehicle’s occupants from the disturbance. On the far side of the pothole, the motor operates as a generator and returns the power back through the supplies. F/OEngineeringandTechnology JamiaMilliaIslamia 21
  • Proposed Design Safety In general, the contact with the road surface is increased. When a car turns through corner or curves, the effect of body roll is almost eliminated. This would decrease the chance to topple over the sides making it safer for the passenger. Also the smoother movement of the vehicle, would prevent damage of the mechanical parts. Thus, making safer for the parts of vehicle. Ride-Comfort The fast response of this system, is able to cancel out the vibration up to a very large extent making it very comfortable. Fail Safe Even if the power supply fails, the passive spring would still absorb the shocks and the regenerative power would help run the EM damper. F/OEngineeringandTechnology JamiaMilliaIslamia 22
  • Proposed Design Limitation • A lot of research still has to be done to bring this design into usable technology • In general, the entire system installation cost is expected to be quiet high. Cost Cut-outs • Comparing to Bose system only a shock absorber has to be changed, hence cost compared to Bose sys should be less. • Operating cost is less, since comparatively a low power is required to operate. • Comparing to active hydraulic system, its cost would be very less. (no use of compressors, lesser power consumption) • On observing level of comfort, safety and loading; compensation could be made. F/OEngineeringandTechnology JamiaMilliaIslamia 23
  • Conclusion • Active suspension offers many benefits over conventional and semi-active suspension systems • Electromagnetic suspension is a high bandwidth and efficient solution for improving handling and comfort • Proposed design of tubular permanent magnet coil in dampers offers a high force density and fail-safe solution. F/OEngineeringandTechnology JamiaMilliaIslamia 24