PMMotor v4 - Permanent-magnet motor model ea > ia ea ia...

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ME457 Mechatronic Systems 1 Permanent-magnet motor model i a e a + > τ , ω PMMOTOR e a i a τ ω
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ME457 Mechatronic Systems 2 Electromechanical coupling F , force; V , velocity; e , voltage; i , current B F i F= i x B L e = V x B L ...physics... .engineering. F = (BL)* i e = (BL)* V B V e +
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ME457 Mechatronic Systems 3 PM Motor model: schematic (Ref.: Introduction to System Dynamics, by Shearer, Murphy, and Richardson, Figure 2-38.)
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ME457 Mechatronic Systems 4 Harnessing e-m coupling in a motor (“a” denotes the armature) F R B V + B rotor F = BL*i a e a = BL*V τ = R*F V = R* ω τ , ω armature windings magnetic field, B
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ME457 Mechatronic Systems 5 Typical “circuit” schematic
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ME457 Mechatronic Systems 6 Ideal PM Motor model GY (BLR) e i τ ω K m = BLR τ = K m *i e = K m * ω Efficiency = ?
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ME457 Mechatronic Systems 7 PM Motor model with losses Ra: electrical resistance of the windings. Rm: mechanical friction. GY (K m ) 1e 1m R a R m e a i a τ ω e b τ i electrical …. conversion …. mechanical
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ME457 Mechatronic Systems 8 PM Motor loss model: equations ω τ τ τ ω = = = + = m i a m i m b b a a a R i Κ K e e i R e * * ω ω ω ω τ η * * * * * * * * 2 2 a m a a m a m a a i
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