Mineral mining installation with electronic control

Claim 2

In a mineral mining installation comprising a winning machine with a main body equipped with at least one rotary cutting means, first drive means carried on the body for driving the cutting means, and second drive means carried on the body for moving the machine; the improvement comprising: the second drive means is a three-phase a.c. motor and an electronic control system remote from the machine controls the second drive means to vary the speed thereof in dependence on the operation of the cutting means.

Claim 3

An installation according to claim 1, wherein the control system includes a frequency converter capable of varying the frequency of a.c. power supplied to said motor.

Claim 4

An installation according to claim 1, wherein the first drive means is at least one three-phase a.c. motor and the control system includes monitoring means for monitoring the power consumption of said motor.

Claim 5

An installation according to claim 3, wherein the control system further includes a frequency converter capable of varying the frequency of a.c. power supplied to said motor constituting the second drive means under control of the monitoring means.

Claim 6

An installation according to claim 3, wherein the first drive means is at least one three-phase asynchronous a.c. motor.

Claim 7

An installation according to claim 1, wherein the control system is incorporated in a control station in a gallery or roadway outside a main working where the winning machine operates and a cable extends between the machine and the control station and serves to supply power to said drive means.

Claim 8

An installation according to claim 6, wherein the cable is a composite cable.

Claim 9

An installation according to claim 1, wherein the machine is mounted for movement along a scraper chain conveyor.

Claim 10

An installation according to claim 1, wherein the second drive means is a three-phase asynchronous a.c. motor.

Claim 11

In a mineral winning installation which employs a self-propelled shearer driven by a three-phase a.c. motor-built onto the body structure of the machine and having at least one rotary cutter drum driven by a further three-phase a.c. motor also built onto the body structure of the machine; the improvement comprising a control station separate from the machine in a gallery or roadway outside the main working in which the shearer operates, a composite cable electrically connecting the motors to the control station, monitoring means in the control station for remotely sensing a function of the motor driving the cutter drum signifying the performance of the latter and control means in the control station for remotely controlling the operational speed of the motor driving the machine in accordance with the performance as sensed by the monitoring means.

Claim 12

In a mineral winning installation which employs a self-propelled shearer driven by a three-phase a.c. motor-built onto the body structure of the machine and having at least one rotary cutter drum driven by a further three-phase a.c. motor also built onto the body structure of the machine; the improvement comprising a control station separate from the machine in a gallery or roadway outside the main working in which the shearer operates, a composite cable electrically connecting the motors to the control station, monitoring means in the control station for remotely sensing a function of the motor driving the cutter drum signifying the performance of the latter and control means in the control station for remotely controlling the operational speed of the motor driving the machine in accordance with the performance as sensed by the monitoring means.

Claim 13

An installation according to claim 10, wherein the monitoring means senses the power consumption of the motor driving the cutter drum and the speed of the motor driving the machine is controlled by varying the frequency of its applied power.