Mining machine

Details Mining machine Mining machine

1977-09-15

1979-02-20

Hohauser, Herman J.

Electricity: motive power systems

Induction motor systems

Secondary circuit control

H02P 762

Patent

active

041409515

ABSTRACT:
A mining machine includes drive unit means for driving a haulage winch and a cutting tool of the machine, the drive unit means comprising a multi-phase induction motor with a wound rotor. In order to control the motor speed, the motor is provided with a circuit connected across the rotor windings and means for varying the effective impedance presented by the said circuit to the rotor windings.

REFERENCES:
patent: 3657622 (1972-04-01), Reuland et al.

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