A 12-pole, brushless, DC motor has a no-load speed of 5000rpm and a stall torque of 50 in-oz when operating at rated voltage of 60V. Testing shows that no-load speed and stall torque vary linearly with applied voltage. Also, with a constant applied voltage the speed decreases linearly as delivered torque increases. Calculate the following: Torque that the motor delivers at 2000 rpm when operated at rated voltage. T a) b) Fundamental frequency of the applied voltage waveform at this...
The peak power of a PMDC motor is 1 W at 12 V. The stall torque at 12 V is 0.2 N-m. What is the torque constant for this motor?
A DC motor supplied from 12 V draws 1.25 amps and turns at 1200 RPM when the load torque is 0.1 N.m. What is the efficiency in percent?
For a PMDC motor powered by a 12 V DC source, the no-load speed and stall torque are 3800 RPM and 30 mNm, respectively. If the motor is running at 2500 RPM, find a) Shaft torque (Tshaft), b) Rotor current (Im), c) Back emf (Eb), d) Electrical power consumed, e) Shaft power, and f) Power loss in rotor coil.
A 227-V three-phase motor runs 1,650 rpm at a load requiring 11 N-m torque. The motor draws 9.5 A of current and the power factor is 0.94, lagging. Determine the power loss (in W) in the motor. (Enter your answer as a number without the units.)
A 208-V three-phase motor runs 1,770 rpm at a load requiring 5 N-m torque. The motor draws 6.5 A of current and the power factor is 0.88, lagging. Determine the power loss (in W) in the motor. (Enter your answer as a number without the units.)
A 220 V DC shunt motor has an armature resistance, Re-0.1 S2, a field resistance, Ry=100 12, and negligible rotational losses. Under certain load conditions, the shunt motor runs at 1600 rpm while drawing a total current, I = 100 A. Determine: a. the output power of the motor; b. the output torque in N-m; and, c. the efficiency Without making any changes to the applied voltage or the field, the motor operates with a new M mechanical load that...
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a current of 50 A when the speed is 1500 r/min when the armature is connected to a source of 48 V, calculate the following: a) The induced emf, EA, and the torque, T, produced at this speed. b) The motor speed, n (in rpm), when the torque is 2 Nm. c) The armature current at 1600 r/min. d) The torque at 1600 r/min. e)...
A 6 hp, 180 V shunt dc motor draws a full-load current of 30 A from the power supply. The motor has a field (shunt) resistance of 150 Ω. The armature resistance of the motor is 0.1 Ω. When the motor speed is 1800 rpm (this is not the full-load speed), the relationship between the induced voltage
FQ3 3. A 240 V DC series motor with 0.1 ohm armature resistance and 0.1 ohm field resistance runs at 1200 rpm and 100 Amp. of full load speed and armature current respectively. The motor has a brush contact drop of 2 volts. Find the motor full load torque and efficiency If the motor is to drive a pump that requires a torque of 150 NM, find the speed as the motor drives the given pump. a. b.