6 Electromagnetism, & DC Motors

# 6 Electromagnetism, & DC Motors - ECE 110 M-C Brunet...

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ECE 110 M.-C. Brunet Electromagnetism, and DC motors Handout 6 Lab 2 and 3 : DC Motor M.-C. BRUNET ECE 110 UIUC 6.1 LAB 2 LAB 3 I.V. graph & Kirchhoff’s laws RCB + - battery RV C om m a n d b o x = values of RCB (knob) V I RCB P power Supplied (battery) Delivered (motor) & Efficiency = Pmotor Pbattery Note: the lab circuit is not exactly that one M + V - I M Today’s Agenda Magnet – Electromagnet Right-Hand-Rules (RHR) MOTOR :magnetic force Next Lecture : GENERATOR : current M.-C. BRUNET ECE 110 UIUC 6.2 Direction of the force F (RHR) Magnitude of the force F Examples!! Magnetic field + Current Force F induced LAWS : Faraday, Lenz, Ampère

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ECE 110 M.-C. Brunet Electromagnetism, and DC motors Handout 6 What is a motor? A device that transforms (electrical power) into (mechanical power) What is a generator? (the opposite of a motor! ) A device that transforms (mechanical power) into (electrical power) M B IF G B FI Motion is created Current is created M.-C. BRUNET ECE 110 UIUC 6.3 6.4 S Axis of rotation I C o il ( N t u r n s ) N M.-C. BRUNET ECE 110 UIUC GENERATOR MOTOR (An example) S Axis of rotation I N + - (a load) (a source) ab Current comes from a power supply (voltage source). Within the magnetic field , the cylinder will rotate (motion generated). The cylinder rotates (e.g. turbine system). Within the magnetic field, a current will be generated, and delivered to a load.
ECE 110 M.-C. Brunet Electromagnetism, and DC motors Handout 6 M.-C. BRUNET ECE 110 UIUC 6.5 Magnet (permanent) Like poles repel Opposite poles attract S N N N Magnet magnetic field around North & South S N 2D Convention : in out M.-C. BRUNET ECE 110 UIUC 6.6 1820: It is observed that a current I creates “B” (“electromagnetism”) All quantities shown are positive I ( >0 ) Direction of B?

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6 Electromagnetism, & DC Motors - ECE 110 M-C Brunet...

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