Electromagnetic interference - Revision history

Tero K: Text replacement - "{{param|PWM}}" to "PWM"

2015-08-28T19:54:53Z

Text replacement - "{{param|PWM}}" to "PWM"

Tero K: Text replacement - "\[\[([A-Z]{2,3})\]\]" to "{{param|$1}}"

2015-08-28T19:54:06Z

Text replacement - "\[\[([A-Z]{2,3})\]\]" to "{{param|$1}}"

Tero K: /* Coupling methods */

2013-08-08T21:15:32Z

‎Coupling methods

Tero K at 18:24, 6 August 2013

2013-08-06T18:24:10Z

Tero K at 18:23, 6 August 2013

2013-08-06T18:23:38Z

Tero K at 19:12, 16 June 2013

2013-06-16T19:12:40Z

Tero K at 19:10, 16 June 2013

2013-06-16T19:10:31Z

Tero K at 19:08, 16 June 2013

2013-06-16T19:08:23Z

Tero K: /* Capacitive coupling in motor control */

2013-06-16T19:06:51Z

‎Capacitive coupling in motor control

Tero K at 19:04, 16 June 2013

2013-06-16T19:04:53Z

@@ Line 10: / Line 10: @@
 *Common-mode impedance coupling
 ===Capacitive coupling in motor control===
-In motor control applications capacitive coupling is the most common cause for EMI problems. Capacitive coupling occurs when unshielded conductors are in each other's proximity and source conductor is carrying voltage signal with high slew rate (dv/dt). Example of such source is the motor leads carrying high voltage {{param|PWM}} signal.
+In motor control applications capacitive coupling is the most common cause for EMI problems. Capacitive coupling occurs when unshielded conductors are in each other's proximity and source conductor is carrying voltage signal with high slew rate (dv/dt). Example of such source is the motor leads carrying high voltage [[PWM]] signal.
 ===Countermeasures===
 The most effective methods of suppressing this noise are:

@@ Line 10: / Line 10: @@
 *Common-mode impedance coupling
 ===Capacitive coupling in motor control===
-In motor control applications capacitive coupling is the most common cause for EMI problems. Capacitive coupling occurs when unshielded conductors are in each other's proximity and source conductor is carrying voltage signal with high slew rate (dv/dt). Example of such source is the motor leads carrying high voltage [[PWM]] signal.
+In motor control applications capacitive coupling is the most common cause for EMI problems. Capacitive coupling occurs when unshielded conductors are in each other's proximity and source conductor is carrying voltage signal with high slew rate (dv/dt). Example of such source is the motor leads carrying high voltage {{param|PWM}} signal.
 ===Countermeasures===
 The most effective methods of suppressing this noise are:

@@ Line 11: / Line 11: @@
 ===Capacitive coupling in motor control===
 In motor control applications capacitive coupling is the most common cause for EMI problems. Capacitive coupling occurs when unshielded conductors are in each other's proximity and source conductor is carrying voltage signal with high slew rate (dv/dt). Example of such source is the motor leads carrying high voltage [[PWM]] signal.
+===Countermeasures===
 The most effective methods of suppressing this noise are:
 *Use shielded conductor and tie cable shield to stable voltage potential such as earth. Cable shield provides Faraday's cage that attenuates the radiating electric field of internal conductors.

← Older revision		Revision as of 18:24, 6 August 2013
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−	[[File:noise1.gif\|thumb\|EMI coupled to a clean signal (blue) can result in noisy signal (red). If ~~this~~ was for example torque [[setpoint signal]], then motor would exhibit torque noise and hissing sound.]]	+	[[File:noise1.gif\|thumb\|EMI coupled to a clean signal (blue) can result in noisy signal (red). If the red curve was for example torque [[setpoint signal]], then motor would exhibit torque noise and hissing sound.]]
	Electromagnetic interference a.k.a. '''EMI''' (also called radio-frequency interference or '''RFI''') is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. These effects can range from a simple degradation of data to a total loss of data.[2] The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights. [http://en.wikipedia.org/wiki/Electromagnetic_interference]		Electromagnetic interference a.k.a. '''EMI''' (also called radio-frequency interference or '''RFI''') is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. These effects can range from a simple degradation of data to a total loss of data.[2] The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights. [http://en.wikipedia.org/wiki/Electromagnetic_interference]

← Older revision		Revision as of 18:23, 6 August 2013
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−	[[File:noise1.gif\|thumb\|EMI coupled to a clean signal (blue) can result in noisy signal (red)]]	+	[[File:noise1.gif\|thumb\|EMI coupled to a clean signal (blue) can result in noisy signal (red). If this was for example torque [[setpoint signal]], then motor would exhibit torque noise and hissing sound.]]
	Electromagnetic interference a.k.a. '''EMI''' (also called radio-frequency interference or '''RFI''') is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. These effects can range from a simple degradation of data to a total loss of data.[2] The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights. [http://en.wikipedia.org/wiki/Electromagnetic_interference]		Electromagnetic interference a.k.a. '''EMI''' (also called radio-frequency interference or '''RFI''') is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. These effects can range from a simple degradation of data to a total loss of data.[2] The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights. [http://en.wikipedia.org/wiki/Electromagnetic_interference]

@@ Line 8: / Line 8: @@
 *Magnetic coupling
 *Capacitive coupling
 ===Capacitive coupling in motor control===
 In motor control applications capacitive coupling is the most common cause for EMI problems. Capacitive coupling occurs when unshielded conductors are in each other's proximity and source conductor is carrying voltage signal with high slew rate (dv/dt). Example of such source is the motor leads carrying high voltage [[PWM]] signal.

@@ Line 15: / Line 15: @@
 *Use [[EMI suppression cores]] near the EMI source. For best efficiency, run only interfering signals through core and leave cable shield and possible earth conductor outside the core.
 [[category:glossary]]
 [[category:troubleshooting]]

← Older revision		Revision as of 19:08, 16 June 2013
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		+	[[File:noise1.gif\|thumb\|EMI coupled to a clean signal (blue) can result in noisy signal (red)]]
	Electromagnetic interference a.k.a. '''EMI''' (also called radio-frequency interference or '''RFI''') is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. These effects can range from a simple degradation of data to a total loss of data.[2] The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights. [http://en.wikipedia.org/wiki/Electromagnetic_interference]		Electromagnetic interference a.k.a. '''EMI''' (also called radio-frequency interference or '''RFI''') is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. These effects can range from a simple degradation of data to a total loss of data.[2] The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights. [http://en.wikipedia.org/wiki/Electromagnetic_interference]

@@ Line 2: / Line 2: @@
 See more at Wikipedia: http://en.wikipedia.org/wiki/Electromagnetic_interference
 ==Coupling methods==
 Most common methods of EMI transfer from source to victim are:
@@ Line 14: / Line 13: @@
 *Use shielded conductor and tie cable shield to stable voltage potential such as earth. Cable shield provides Faraday's cage that attenuates capacitive coupling outside the shield.
 *Use [[EMI suppression cores]] near the EMI source.