Master-slave motor system with start-up control circuit

Claim 2

A control system in which the speed of a first motor is regulated from a first adjustable unit, and the speed of a second motor is regulated in accordance with a speed control signal, having a start-up control circuit including: a second adjustable unit, connected to provide a start-up signal which is a function of a condition of the first adjusting unit; means for applying to the start-up control circuit a speedindicating signal which is a function of the actual speed of at least one of the motors; switching means for supplying the speed control signal from one of the start-up and speed-indicating signals; and means for regulating operation of the switching means as a function of the speed of one of the first and second motors.

Claim 3

A control system as claimed in claim 1, in which the speed-indicating signal is supplied as a function of the actual speed of the first motor, which speed-indicating signal is applied to both the switching means and to the means for regulating the switching means, to effect a transition in speed control of the second motor from the start-up signal to the first motor speed-indicating signal when the first motor speed-indicating signal attains a predetermined amplitude.

Claim 4

A control system as claimed in claim 1, in which the speed-indicating signal Is supplied as a function of the actual speed of the first motor and which speed-indicating signal is applied to the switching means, and further comprising means, coupled between the second motor and the switching means, to provide a switching signal as a function of the second motor speed, to regulate operation of the switching means and effect a transition in speed control of the second motor from the start-up signal to the first motor speed-indicating signal when the switching signal indicates the second motor has attained a predetermined speed.

Claim 5

A control system as claimed in claim 1 in which said switching means includes a relay having a contact set with a first fixed contact coupled to the second adjusting unit, a second fixed contact connected to receive the speed-indicating signal as a function of the actual speed of the first motor, and a movable contact connected to pass the speed control signal toward the second motor, and further comprising means, coupled between the second motor and the means for regulating operation of the switching means, for providing a switching signal which varies as a function of the speed of the second motor, so that as the second motor attains a predetermined speed, the relay is actuated from the start-up position to the run position in which the speed control signal is supplied in accordance with the speed-indicating signal from the first motor.

Claim 6

A control system in which the speed of a master motor is regulated from a first potentiometer, and the speed of a slave motor is regulated in accordance with a speed control signal, having a start-up control circuit including: a second potentiometer, connected to provide a start-up signal which is a function of the setting of the first potentiometer; means for applying to the start-up control circuit a speed-indicating signal which is a function of the actual speed of one of the motors; switching means, including a relay having a winding and a contact set, for supplying the speed control signal from one of the start-up and speed-indicating signals; and a regulator, including the relay winding, for operating the switching means as a function of the speed of one of the master and slave motors.

Claim 7

A control system in which the speed of a master motor is regulated from a first potentiometer, and the speed of a slave motor is regulated in accordance with a speed control signal, having a start-up control circuit including: a second potentiometer, connected to provide a start-up signal which is a function of the setting of the first potentiometer; means for applying to the start-up control circuit a speed-indicating signal which is a function of the actual speed of one of the motors; switching means, including a relay having a winding and a contact set, for supplying the speed control signal from one of the start-up and speed-indicating signals; and a regulator, including the relay winding, for operating the switching means as a function of the speed of one of the master and slave motors.

Claim 8

A control system as claimed in claim 5, in which the speed-indicating signal is supplied as a function of the actual speed of the master motor, which speed-indicating signal is applied to both the switching means and to the regulator, to effect a transition in speed control of the slave motor from the start-up signal to the master motor speed-indicating signal when the master motor speed-indicating signal attains a predetermined amplitude.

Claim 9

A control system as claimed in claim 5, in which the speed-indicating signal is supplied as a function of the actual speed of the master motor and which speed-indicating signal is applied to the switching means, and further comprising a conductor, coupled between the slave motor and the switching means, to provide a switching signal as a function of the slave motor armature voltage, to regulate operation of the switching means and effect a transition in speed control of the slave motor from the start-up signal to the master motor speed-indicating signal when the switching signal indicates the slave motor has attained a predetermined speed.

Claim 10

A control system as claimed in claim 5, in which said contact set includes a first fixed contact coupled to the second potentiometer, a second fixed contact connected to receive the speed-indicating signal as a function of the actual speed of the master motor, and a movable contact connected to pass the speed control signal toward the slave motor, and further comprising means, coupled in the regulator, for providing a reference signal against which the speed-indicating signal is compared, for providing a switching signal to operate the relay as one of the motors attains a predetermined speed, to thereafter control the slave motor speed in accordance with the speed-indicating signal From the master motor.

Claim 11

A control system in which the speed of a master motor is regulated from a first potentiometer, and the speed of a slave motor is regulated in accordance with a speed control signal, including a start-up control circuit comprising: a relay having a winding, first and second fixed contacts, and a movable contact; a second potentiometer, connected to provide a start-up signal to the first fixed contact, which start-up signal varies in accordance with variations in the setting of the first potentiometer; a tachometer, connected to be driven as a function of the master motor speed, to supply a speed-indicating signal to the second fixed contact of the relay; a conductor coupled to the movable contact of the relay, for providing the speed control signal to the slave motor; and a regulator connected to energize and deenergize the relay winding, including a comparison circuit having means for establishing a reference voltage level, a conductor coupled between the slave motor and the comparison circuit, for applying a switching signal which varies as a function of the slave motor speed, and a trigger circuit, coupled between the comparison circuit and the relay winding, for effecting a rapid transition between the nonoperated and operated states of the relay when the amplitude of the switching signal exceeds the reference voltage level.

Claim 12

A control system in which the speed of a master motor is regulated from a first potentiometer, and the speed of a slave motor is regulated in accordance with a speed control signal, including a start-up control circuit comprising: a relay having a winding, first and second fixed contacts, and a movable contact; a second potentiometer, connected to provide a start-up signal to the first fixed contact, which start-up signal varies in accordance with variations in the setting of the first potentiometer; a tachometer, connected to be driven as a function of the master motor speed, to supply a speed-indicating signal to the second fixed contact of the relay; a conductor coupled to the movable contact of the relay, for providing the speed control signal to the slave motor; and a regulator connected to energize and deenergize the relay winding, including a comparison circuit having means for establishing a reference voltage level, a conductor coupled between the slave motor and the comparison circuit, for applying a switching signal which varies as a function of the slave motor speed, and a trigger circuit, coupled between the comparison circuit and the relay winding, for effecting a rapid transition between the nonoperated and operated states of the relay when the amplitude of the switching signal exceeds the reference voltage level.