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motors_inclass - DC motors Unit 2 Modeling in the Frequency...

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Unformatted text preview: DC motors Unit 2: Modeling in the Frequency Domain Part 6: Modeling DC Motors Engineering 5821: Control Systems I Faculty of Engineering & Applied Science Memorial University of Newfoundland February 3, 2009 ENGI 5821 Unit 2, Part 6: Modeling DC Motors DC motors 1 DC motors Evaluating Motor Parameters ENGI 5821 Unit 2, Part 6: Modeling DC Motors DC motors We consider here only one kind of electromechanical system—the armature-controlled DC servomotor. DC motors We consider here only one kind of electromechanical system—the armature-controlled DC servomotor. It consists of the following components: DC motors We consider here only one kind of electromechanical system—the armature-controlled DC servomotor. It consists of the following components: Armature: Current-carrying wire wrapped around a rotating member called the rotor . DC motors We consider here only one kind of electromechanical system—the armature-controlled DC servomotor. It consists of the following components: Armature: Current-carrying wire wrapped around a rotating member called the rotor . Fixed field: Permanent magnets (often augmented as electromagnets) which create a fixed magnetic field that is perpendicular to the surface of the rotor. DC motors We consider here only one kind of electromechanical system—the armature-controlled DC servomotor. It consists of the following components: Armature: Current-carrying wire wrapped around a rotating member called the rotor . Fixed field: Permanent magnets (often augmented as electromagnets) which create a fixed magnetic field that is perpendicular to the surface of the rotor. DC motors We consider here only one kind of electromechanical system—the armature-controlled DC servomotor. It consists of the following components: Armature: Current-carrying wire wrapped around a rotating member called the rotor . Fixed field: Permanent magnets (often augmented as electromagnets) which create a fixed magnetic field that is perpendicular to the surface of the rotor. The job of the commutator is to reverse the direction of current so that the conductor experiences the same force while the rotor rotates. The job of the commutator is to reverse the direction of current so that the conductor experiences the same force while the rotor rotates. The magnetic field imposes a total force on the armature circuit of F = 2 Bli a where B is the magnetic field strength, 2 l is the total length of the conductor that is perpendicular to the field, and i a is the current. The job of the commutator is to reverse the direction of current so that the conductor experiences the same force while the rotor rotates. The magnetic field imposes a total force on the armature circuit of F = 2 Bli a where B is the magnetic field strength, 2 l is the total length of the conductor that is perpendicular to the field, and i a is the current. Multiplying by the rotor’s radius r we obtain a torque, The job of the commutator is to reverse the direction of current so that the conductor experiences the same force while the rotor...
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motors_inclass - DC motors Unit 2 Modeling in the Frequency...

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