Electrical Mach...

The direction of rotation of the universal motor can be reversed by reversing the flow of current through?

A 4 pole, 200 W, 110 V, 50 Hz single phase induction motor has Rotor impedance at standstill of (3.6 + j2.4) Ω. What is the value of forward and backward rotor resistances respectively when the motor is running at a speed of 1440 rpm?

A 50 Hz single phase induction motor runs with slip 4%. The frequencies of the current induced in the rotor by the forward filed and backward filed respectively are

The starting current in the main and auxiliary winding of a single-phase induction motor is I_M = 5∠-80° A and I_A = 2∠-50° A. The rotor resistance referred to primary is \(R_2^{'} = 1\;{\rm{\Omega }}\). The rotor of number of turns of the auxiliary and the main winding \(a = \frac{{{N_A}}}{{{N_M}}} = 0.2\). The starting torque in synchronous watts is _________

A single-phase resistor split induction motor draws θ_m = 50° lagging main winding current at starting. To have maximum starting torque, the power angle θ_a in degrees of the auxiliary winding current should be ________

A 250 W, 230 V, 50 Hz capacitor start motor has the following constants for the main and auxiliary winding:

Main winding, Z_m = (4.5 + j 3.7) Ω

Auxiliary winding, Z_a = (9.5 + j3.5) Ω

The value of the starting capacitor (in μF) that will place the main and auxiliary winding currents in quadrature at starting is _________

A 400 W, 120 V, 50 Hz capacitor start motor has main winding impedance Z_m = 3 + j4 Ω and auxiliary winding impedance Z_a = 6 + j8 Ω at starting.

The value of starting capacitance (in μF) to be added in series with the auxiliary winding to obtain maximum torque at starting is ________

The resistance and reactance of the main winding of a 50 Hz single phase induction motor are 1 Ω and √3 Ω, respectively. The motor is capacitor start motor. The power factor angle of the auxiliary winding to achieve maximum starting torque is ________ (in degrees)