b) Draw the speed control block diagram of the DC motor, which can be controlled with armature voltage and field flux with 3 phase AC-DC driver, and explain how the speed control is done.
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b) Draw the speed control block diagram of the DC motor, which can be controlled with armature voltage and field flux with 3 phase AC-DC driver, and explain how the speed control is done.
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- What type of speed control method provides above the normal speed of the DC series motor? O a. Armature control method O b. Armature resistance control O c. Field diverter O d. Flux control method5) Flux control, voltage control, and armature control are three methods for ...... of dc motor.the BLDC motors have the advantage of High Efficiency Compactness Low Maintenance All of the answers When the speed of the DC motor is Increases its Armature current Remain Constant Decreases Increases Any of the answers A variable reluctance stepper motor is constructed of .. . material with salient poles. ferromagnetic paramagnetic non-magnetic diamagnetic
- A 240-volt series motor has an armature resistance of 0.42 ohm and a series-field resistance of 0.18 ohm. If the speed is 500 rpm when the current is 36 A, what will be the motor speed when the load reduces the line current to 21 A? (Assume a 3-volt brush drop and that of the flux is proportional to the current.). Ans.: 1435 rpm show diagram and step by step processProblem 3 A dc shunt motor runs at 900 rpm from a 400V supply when taking an armature current of 25A. Calculate the speed at which it will run from a 230V supply when taking an armature current of 15A. The resistance of the armature circuit is 0.8ohm. Assume flux per pole at 230V to have decreased to 75% of its value at 400V.Explain speed current and torque current characterstics of d.c. series motor.
- Does a DC motor have to be turning in order for it to develop torque? a) yes b) no Most DC motor consist of many turns per armature loop as well as many evenly distributed loops per al mature. a) true b) false Brushes a DC motor. a) are part of the electrical circuit in b) provide a sliding electrical contact to the commutator of c) are made of a material which is softer than the commutator segments of d) all of the aboveA 550-volt long-shunt compound motor has armature an resistance of 0.815 ohm and a series field resistance of 0.15 ohm. The full load speed is 1,900 rpm when the armature current is 22 amp. (a) At what speed will the motor operate at no load if the armature current drops to 3 amp with a corresponding drop in flux to 88 per cent of the full-load value? (Assume a brush drop of 5 volts at full load and 2 volts at no load.) (b) Calculate the percent speed regulation of the motor.250 V d.c. Shunt motor has an armature current of 20A when running at 1000 r.p.m at full load. The armature resistanc is 0.5 ohm. What resistance must be inserted in series with the armature to reduce the speed to 500 r.p.m. Assume load torque constant and magnetization curve to be linear
- A 110-V, 1-phase, 4-pole, 60-Hz induction motor has the following circuit constants: R1 = R2’ = 1.6 ohm,X1 = X2’ = 1.8 ohm, Xm = 60 ohm; core loss is 16 W and friction and windage loss is 12 W. Determine theefficiency of the motor at 0.04 slip by using (a) the exact equivalent circuit and (b) the approximateequivalent circuitA 250 V DC shunt motor runs at 950 rpm and takes a line current of 55A.Find the resistance to be added to the field circuit to increase the speed 1200 rpm at an armature current of 75A.Take magnetic flux proportional to field current. Armature resistance is 0.1 ohm and field winding resistance is 125 ohms.A DC series motor having a resistance of 0.4 o and runs at 2000 rpm when connected to 250 V supply and drawing a current of 2O A. (i) What resistance must be added in order to limit the speed to 4000 rpm when armature current is 5A? Assume flux varies linearly. (ii) What resistance must be added to limit the speed to 1000 rpm when armature current is 30 A? Assume that the flux at 30 A is 20% more than that at 20A. (iii) At what speed the motor will run if it is connected directly to 250 V supply when the load is such that the current drawn is 30 A? *