Speed adjusting system for grinding wheel drives and the like

Claim 2

In a drive system including a variable speed drive means for rotatably driving a cylindrical member subject to variations in diameter during drive system operation, speed adjusting control means comprising: command means for producing a fixed command signal, means for producing an incremental current signal proportional to the incremental current required to accelerate the cylindrical member at a predetermined rate, first means coupled to said incremental current signal generating means and responsive to the incremental current signal to produce a first output proportional to the speed of the drive means required to produce a predetermined peripheral speed of the cylindrical member, second means for producing a second output proportional to the actual speed of the drive means, third means coupled to said first and second means and responsive to the first and second outputs to produce a net feedback signal substantially equal in magnitude to the fixed command signal when the actual speed of the drive means as indicated by the second output is equal to the speed established by the first output, and regulating means coupled to said command means and said third means and responsive to the command signal and the net feedback signal for controlling the speed of the drive means.

Claim 3

Speed adjusting control means as defined by claim 1 in which the first output produced by said first means has a magnitude proportional to I/(A + BI) where I is the magnitude of the incremental current, and A and B are constants of proportionality.

Claim 4

Speed adjusting control means as defined by claim 2 in which the first and second outputs produced by said first and second means, respectively, are electrical signals.

Claim 5

Speed adjusting control means as defined by claim 2 in which said first means comprises an output member movable in response to the incremental current signal, the magnitude of the first output being established by the position of said output member.

Claim 6

In a drive system including a variable speed drive means for rotatably driving a cylindrical member subject to variations in diameter during drive system operation, speed adjusting control means comprising: command means for producing a fixed command signal, means effective during acceleration of the cylindrical member at a predetermined rate for producing an incremental current signal proportional to the incremental current utilized to accelerate the cylindrical member at the predetermined rate and to the diameter of the cylindrical member, first means for producing a first output in response to an input signal and for maintaining the first output upon removal of the input signal, switching means effective during acceleration of the cylindrical member at said predetermined rate to couple said incremental signal generation means and said first means so as to supply the incremental current signal to said first means as an input signal, and said switching means thereafter effective to uncouple said incrEmental signal generation means, said first means responsive to the incremental current signal such that the first output produced in response thereto has a magnitude proportional to the speed of the drive means required to produce a predetermined peripheral speed of the cylindrical member at the diameter indicated by the incremental current signal, second means for producing a second output proportional to the actual speed of the drive means, third means coupled to said first and second means and responsive to the first and second outputs to produce a net feedback signal substantially equal in magnitude to the fixed command signal when the actual speed of the drive means as indicated by the second output is equal to the speed established by the first output, and regulating means coupled to said command means and said third means and responsive to the command signal and the net feedback signal for controlling the speed of the drive means.

Claim 7

In a drive system including a variable speed drive means for rotatably driving a cylindrical member subject to variations in diameter during drive system operation, speed adjusting control means comprising: command means for producing a fixed command signal, means effective during acceleration of the cylindrical member at a predetermined rate for producing an incremental current signal proportional to the incremental current utilized to accelerate the cylindrical member at the predetermined rate and to the diameter of the cylindrical member, first means for producing a first output in response to an input signal and for maintaining the first output upon removal of the input signal, switching means effective during acceleration of the cylindrical member at said predetermined rate to couple said incremental signal generation means and said first means so as to supply the incremental current signal to said first means as an input signal, and said switching means thereafter effective to uncouple said incrEmental signal generation means, said first means responsive to the incremental current signal such that the first output produced in response thereto has a magnitude proportional to the speed of the drive means required to produce a predetermined peripheral speed of the cylindrical member at the diameter indicated by the incremental current signal, second means for producing a second output proportional to the actual speed of the drive means, third means coupled to said first and second means and responsive to the first and second outputs to produce a net feedback signal substantially equal in magnitude to the fixed command signal when the actual speed of the drive means as indicated by the second output is equal to the speed established by the first output, and regulating means coupled to said command means and said third means and responsive to the command signal and the net feedback signal for controlling the speed of the drive means.

Claim 8

Speed adjusting control means as defined by claim 5 in which the first output produced by said first means has a magnitude proportional to I/(A + BI) where I is the magnitude of the incremental current, and A and B are constants of proportionality.

Claim 9

Speed adjusting control means as defined by claim 6 in which the first and second outputs produced by said first and second means, respectively, are electrical signals.

Claim 10

Speed adjusting control means as defined by claim 7 in which first means further comprises energy storage means for maintaining a charge proportional to the incremental current signal, means for receiving fixed signals proportional to the constants of proportionality A and B, and static network means responsive to the charge of said energy storage means and the signals proportional to the constants A and B to produce the first output.

Claim 11

Speed adjusting control means as defined by claim 8 in which said static network means comprises a solid state multiplier having a first input coupled to said energy storage means and a second input connected to receive the fixed signal proportional to the constant B for producing an output proportional to BI, summing means coupled to the output of said solid state multiplier and to receive the fixed signal proportional to A for producing an output proportional to A + BI, and a solid state divider having a dividend input coupled to said energy storage means and a divisor input coupled to the output of said summing means for producing the first output.

Claim 12

Speed adjusting control means as defined by claim 6 in which said first means comprises an output member movable in response to the incremental current signal, the magnitude of the first output being established by the position of said output member.

Claim 13

Speed adjusting control means as defined by claim 10 in which the second output produced by said second means is an electrical voltage and in which: said first means further comprises a motor driven potentiometer and a resistive network coupled between said switching means and the slider arm of said potentiometer, said resistive network being selected such that the position of the slider arm is established in accordance with the aforesaid relationship I/(A + BI), and in which said third means comprises an auxiliary potentiometer having a slider arm coupled to and positioned in unison with the slider arm of said motor driven potentiometer, said auxiliary potentiometer being coupled between said second means for receiving the second output therefrom and a source of fixed voltage and the slider arm of said auxiliary potentiometer being coupled to said regulating means for supplying the feedback signal thereto.