4) i. no load speed. it is the speed achieved by the motor at no load,
ii. no load current. the current applied to a motor at no load is known as no load current, it is generally very small and is used to overcome the internal frictions.
iii. maximum continuous stall torque. it is the maximum toque a motor can produce when stalled, in the long run, without damaging the motor.
iv. electrical time constant (=L/R) it is the time needed for the current to reach 63% of its final value in response to a step input in voltage.
v. torque constant is similar to motor constant. motor torque constant simply is motor torque divided by armature current.
4. Find the correct motor property corresponding to each statement. Speed when no load and powered...
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...
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.
Q5.8：The specifications of machine 5.8. For the machine in the previous question, calculate (a) its no-load speed (b)its rated efficiency-olcoxL-n/nN (c) the following when the speed is zero (stall condition) (i)induced voltage (ii) nput current (ii) output torque (iv) ut power (v)output power (vi) efficiency (d) he speed (in rpm) when the torque is 0.2 Nm 5 A DC machine has a no-load speed of 10,000 rpm and a rated speed of 8,000 rpm when operating with its rated supply...