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what is the difference between squirrel cage & slip ring
induction motor?
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Answer Posted / bimal sarkar
1. Almost 90 per cent motor used in industry is squirrel-
cage motor. It is low price and low maintenance cost.
Slip-ring motor opposite of squirrel-cage motor.
2. Squirrel-cage rotor consists of cylindrical laminated
core with parallel slots. There are no wire winding but
consists of heavy bars of copper, aluminum or alloys and
all slots are short by End-ring.
Slip-ring rotor consisting with 3-phase, double-layer
winding of copper coils and it’s short by slip-ring through
external resistance.
3. It is not possible to add any external resistance in
series with the rotor circuit.
There is used an external resistance in series with the
rotor circuit by carbon brushes which is mounted on slip-
ring.
4. It’s stator circuit can be change by star or delta with
suitable requirement.
It’s stator circuit internally short by star connection.
Not possible to change in delta connection.
5. Squirrel-cage motor speed cannot control, If we are not
connected any variable drives.
Slip-ring motor speed can control by it’s external
resistance which is connected in series with rotor winding.
6. The starting torque per ampere is very low and goes to
full-load torque it have 1.5 times although the starting
current is 5 to 7 times the full-load current . The motor
has not useful to start against heavy loads.
Increases the rotor impedance due to addition of external
resistance and so reduce the rotor current. Starting torque
is increased but after a certain point, the effect of
increased impedance predominates the effect of improved
power factor and the torque starts decreasing.
| Is This Answer Correct ? | 15 Yes | 6 No |
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