EDDY CURRENT BRAKES

Submitted By-Lumbha ram

Submitted to-Dr RR JOSHI

HOD ELECTRICAL DEPT

What are Eddy Current Brakes

Eddy current brakes are responsible for slowing an object such as rotating machinery a moving train or even a roller coaster

Type Rotational

Linear

How do they workbull A magnetic field

induces a voltage in moving objects due to Faradayrsquos Law

bull The induced voltage causes an eddy current to flow in any conducting objects

bull This current produces a counter-opposing flux and Lorentz force to slow the moving object

bull The current also produces ohmic losses and significant heating

How does it workbullElectrical current is sent to coils which alternate polarities creating an electromagnetic fieldbullEddy currents generated in two rotors as they spin through the field slow the rotation of the driveshaft

Rotating objects enclosed in air band

Fixed

How can they be analyzedbullMaxwell 3D Transient solver which is well suited for magnetic problems with motion1048714Solves transient magnetic fields caused by time-varying or moving electrical sources and permanent magnetsbullUses both linear and nonlinear materialsbullExcitation can be DC sinusoidal and transient voltages or currents An external schematic circuit is availablebullConsiders skin and proximity effectsbullConsiders motion-induced eddy currentsbullConsiders time-diffusion of magnetic fields

• EDDY CURRENT BRAKES
• What are Eddy Current Brakes
• Slide 3
• Slide 4
• Slide 5
• Slide 6

What are Eddy Current Brakes

Eddy current brakes are responsible for slowing an object such as rotating machinery a moving train or even a roller coaster

Type Rotational

Linear

How do they workbull A magnetic field

induces a voltage in moving objects due to Faradayrsquos Law

bull The induced voltage causes an eddy current to flow in any conducting objects

bull This current produces a counter-opposing flux and Lorentz force to slow the moving object

bull The current also produces ohmic losses and significant heating

How does it workbullElectrical current is sent to coils which alternate polarities creating an electromagnetic fieldbullEddy currents generated in two rotors as they spin through the field slow the rotation of the driveshaft

Rotating objects enclosed in air band

Fixed

How can they be analyzedbullMaxwell 3D Transient solver which is well suited for magnetic problems with motion1048714Solves transient magnetic fields caused by time-varying or moving electrical sources and permanent magnetsbullUses both linear and nonlinear materialsbullExcitation can be DC sinusoidal and transient voltages or currents An external schematic circuit is availablebullConsiders skin and proximity effectsbullConsiders motion-induced eddy currentsbullConsiders time-diffusion of magnetic fields

• EDDY CURRENT BRAKES
• What are Eddy Current Brakes
• Slide 3
• Slide 4
• Slide 5
• Slide 6

How do they workbull A magnetic field

induces a voltage in moving objects due to Faradayrsquos Law

bull The induced voltage causes an eddy current to flow in any conducting objects

bull This current produces a counter-opposing flux and Lorentz force to slow the moving object

bull The current also produces ohmic losses and significant heating

How does it workbullElectrical current is sent to coils which alternate polarities creating an electromagnetic fieldbullEddy currents generated in two rotors as they spin through the field slow the rotation of the driveshaft

Rotating objects enclosed in air band

Fixed

How can they be analyzedbullMaxwell 3D Transient solver which is well suited for magnetic problems with motion1048714Solves transient magnetic fields caused by time-varying or moving electrical sources and permanent magnetsbullUses both linear and nonlinear materialsbullExcitation can be DC sinusoidal and transient voltages or currents An external schematic circuit is availablebullConsiders skin and proximity effectsbullConsiders motion-induced eddy currentsbullConsiders time-diffusion of magnetic fields

• EDDY CURRENT BRAKES
• What are Eddy Current Brakes
• Slide 3
• Slide 4
• Slide 5
• Slide 6

How does it workbullElectrical current is sent to coils which alternate polarities creating an electromagnetic fieldbullEddy currents generated in two rotors as they spin through the field slow the rotation of the driveshaft

Rotating objects enclosed in air band

Fixed

How can they be analyzedbullMaxwell 3D Transient solver which is well suited for magnetic problems with motion1048714Solves transient magnetic fields caused by time-varying or moving electrical sources and permanent magnetsbullUses both linear and nonlinear materialsbullExcitation can be DC sinusoidal and transient voltages or currents An external schematic circuit is availablebullConsiders skin and proximity effectsbullConsiders motion-induced eddy currentsbullConsiders time-diffusion of magnetic fields

• EDDY CURRENT BRAKES
• What are Eddy Current Brakes
• Slide 3
• Slide 4
• Slide 5
• Slide 6

Rotating objects enclosed in air band

Fixed

How can they be analyzedbullMaxwell 3D Transient solver which is well suited for magnetic problems with motion1048714Solves transient magnetic fields caused by time-varying or moving electrical sources and permanent magnetsbullUses both linear and nonlinear materialsbullExcitation can be DC sinusoidal and transient voltages or currents An external schematic circuit is availablebullConsiders skin and proximity effectsbullConsiders motion-induced eddy currentsbullConsiders time-diffusion of magnetic fields

• EDDY CURRENT BRAKES
• What are Eddy Current Brakes
• Slide 3
• Slide 4
• Slide 5
• Slide 6

• EDDY CURRENT BRAKES
• What are Eddy Current Brakes
• Slide 3
• Slide 4
• Slide 5
• Slide 6