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motors
lesson 5 Squirrel- Cage motors
| Question | Answer |
|---|---|
| The ? is the stationary part of an AC motor; it consists of a laminated iron core and windings (or coils) that convert electrical energy to the energy of a magnetic field. | stator |
| The rotor is mounted on a ? that is used to transfer power to the load. | shaft |
| true/false The main difference between different types of 3-phase motors is the design of the rotors and windings. | true |
| ? has a high starting torque, low starting current, and low slip. | Motor Design C |
| The ? provides a short-circuit path for induced current to circulate within a rotor. | shorting ring |
| ? motors are suitable for equipment with very high-inertia starts, such as cranes and hoists. | Design D |
| A squirrel-cage motor is very similar to a ? , but with a rotating secondary. | transformer |
| ? motors are designed for a broad variety of applications, such as in HVAC applications providing power for fans and blowers and in industrial applications providing power for pumps. | Design B |
| true/false Mutual induction typically requires the presence of a magnetic field without the movement of a conductor within that field. | false |
| The left-hand coil rule describes the ? of the magnetic poles created by the current flow. | polarity |
| The direction of torque in a motor can be determined with the ? rule. | right-hand motor |
| true/false When troubleshooting a motor control circuit, the voltage at the transformer secondary side should be checked if the voltage reading at the control transformer primary is correct. | true |
| true/false When measuring the resistance of two equal coils connected in parallel, the total resistance is one half the resistance of one coil. | true |
| When troubleshooting a 3-phase motor, the motor windings should be checked for any opens or shorts by using a DMM set to measure ? . | resistance |
| When troubleshooting a motor control circuit, if the fuses or circuit breaker on the control transformer are blown or tripped, it is possible the ? needs to be replaced. | transformer |
| true/false The bars of Design B motors are narrow and are placed deep in the iron, which increases the reactance and raises the current, while maintaining normal starting torque. | false increases the reactance and lowers the current while maintaining normal starting torque |
| The rotor's magnetic field and the stator's magnetic field interact to create ? . | torque |
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Athomp705