What is the relationship between torque and counterelectromotive force (CEMF)?

What is the relationship between torque and counterelectromotive force (CEMF)?

• A. They are directly proportional
• B. Torque increases as CEMF increases
• C. Torque is inversely proportional to CEMF
• D. They have no relationship

Answer: (C)

Torque and counterelectromotive force (CEMF) are related concepts in the operation of electric motors. Specifically, in a typical motor, as the speed of the motor increases, the CEMF also increases. CEMF acts against the applied voltage and limits the current flowing through the motor. When the CEMF is high, it results in less current being drawn from the power source. Since the torque produced by a motor is directly proportional to the current flowing through it (neglecting other factors like motor design), a higher CEMF corresponds to lower current and, subsequently, lower torque. Therefore, torque is inversely related to CEMF: as the CEMF increases (leading to reduced current), the torque decreases. This relationship is fundamental to understanding motor dynamics and is a crucial concept in motor control and analysis.

Torque and counterelectromotive force (CEMF) are related concepts in the operation of electric motors. Specifically, in a typical motor, as the speed of the motor increases, the CEMF also increases. CEMF acts against the applied voltage and limits the current flowing through the motor.

When the CEMF is high, it results in less current being drawn from the power source. Since the torque produced by a motor is directly proportional to the current flowing through it (neglecting other factors like motor design), a higher CEMF corresponds to lower current and, subsequently, lower torque.

Therefore, torque is inversely related to CEMF: as the CEMF increases (leading to reduced current), the torque decreases. This relationship is fundamental to understanding motor dynamics and is a crucial concept in motor control and analysis.