Which of the relationship is correct in Permanent magnet DC motor?(a) T ∝ (Ia)^2(b) T ∝ (Ia)^0(c) T ∝ Ia(d) T^2 ∝ IaI had been asked this question by my school teacher while I was bunking the class.Query is from Solar Powered Pump Drives in section Solar and Battery Powered Drives of Electric Drives

Which of the relationship is correct in Permanent magnet DC motor?(a)

1.	Which of the relationship is correct in Permanent magnet DC motor?(a) T ∝ (Ia)^2(b) T ∝ (Ia)^0(c) T ∝ Ia(d) T^2 ∝ IaI had been asked this question by my school teacher while I was bunking the class.Query is from Solar Powered Pump Drives in section Solar and Battery Powered Drives of Electric Drives
Answer» Right ANSWER is (c) T ∝ Ia To elaborate: The value of FLUX remains constant in PERMANENT MAGNET DC motor. The torque in the PMMC motor is DIRECTLY proportional to the armature current.

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