Connecting a compound motor
Step One?
Disconnect motor from load
2 ways to reduce current to the armature of a DC motor?
1. Connect resistance in series
2. use electronic controller to supply variable voltage.
In the shaded pole motor, the shading coil acts like _ transformer secondary.
Shorted
The output voltage of the shunt generator is set when the load is
Disconnected
multispeed fan motors achieve multiple speeds by inserting additional _ in series with the run winding
Windings
Step 2?
Connect the series field and armature windings together to form a series connection
List 3 basic types of DC motors.
1. Series
2. Shunt
3. Compound
IN a generator, the series field diverter is also called the
series field shunt rheostat
Armatures are wound to provide high voltage, high current or specific combination of voltage and current. the winding that provides moderate voltage and moderate current is the _ wound
Frogleg
The _ winding is made of many small wire and is located at the top of stator core.
Start
Step 3?
Turn on power momentarily to determine direction of rotation
When a DC machine is used as a motor what function does the commutator perform?
Rotary switch and maintains the correct direction of current flow
The output voltage of a shunt generator is usually controlled by the amount of
Field excitation current
Device that converts mechanical input into DC electrical output is a
Generator
Brushless DC motors that require very smooth operation such as grinders that produce a finished surface are powered by _ waves
Sine
If motor spins in wrong direction what should you do?
Switch motor leads
List two factors that determine the amount of torque produced by a DC motor.
1. Pole pieces
2. Magnetic field of armature
Conductive Compensation is accomplished by connecting the compensating winding in _ with the armature
Series
In a compound generator, the setting of the amount of currents in the series and shunt field windings determines the
Compounding
A _ motor operates on the principle that like magnetic poles repel
Repulsion
Step 4?
Connect the shunt field leads to the incoming power
The amount of CEMF produced in the armature of a DC motor is proportional to what three factors?
1. Number of turns of wire in armature
2. Strength of magnetic field
3. Speed of armature
The magnetic field is sometimes provided by electromagnets. This is done by windings that are wound around
Pole Pieces
What type of motor must never be operated under a no load condition?
Series
when full voltage is applied to the armature and reduced current flows through the shunt field, the motor operates at _
Overspeed.