Finding the starting torque for a 3 Phase, 50 Hz, 6 Pole Wound Motor Induction Machine

If you could show me how to do each part that would be great, but the main one is the start up torque. Find: the starting torque, the maximum torque, the speed at maximum torque and sketch the torque/speed curve for a 3 phase, 50 Hz, 6 pole wound motor induction machine.

DC Machines Problem

A 2kW series DC motor has an armature and field resistance of 0.16 W. If the power output from the motor is 1600W at 1200 rpm, with an armature current of 25 A and a supply voltage of 72 V, calculate: (1). The torque and emf constants for this motor (2). If the supply has a maximum power rating of 2000W, calculate the maximum torque available from the motor when taking the maximum power available from the supply. (3). Calculate the efficiency of the motor at this maximum value of torque (4). Calculate the new speed of this motor if the motor torque is reduced by 80%.

DC Machines

A DC shunt motor has the following parameters: Ra=0.16W, Rf =36 W, supply voltage of 72V, Kt=0.278 , torque of 12.73 Nm at a speed of 1200 rpm. (1). Calculate the emf constant, armature current and efficiency of this motor at this value of load (2). What is the new speed of the motor if the torque is reduced by 80% (3). Calculate the field resistance required to increase the speed of the motor to 2000 rpm with a load torque of 12.73 Nm.

DC Machine

An electric vehicle requires a starting torque of 300Nm to accelerate at an appropriate rate from rest. The battery voltage of the vehicle is 240VDC and the motor is a series type. From the following information derive the motor parameters and the torque and emf constants: (1). At start up the motor takes a current of 120A. At a speed of 1500 rpm the torque is 42 Nm (2). Calculate the efficiency of this motor at 500 rpm and at 1500 rpm

Three-phase squirrel cage induction motor

Calculate: (i) the power factor at full load, (ii) the active power supplied to the rotor, (iii) the total I2R losses in the rotor, (iv) the load mechanical power and torque and the efficiency of the motor. (v) Estimate the starting torque for the machine, making clear any assumptions that you make.