Position or velocity control system and method

Patent metadata

Field	Value
Publication number	US-10890895-B2
Application number	US-201715841575-A
Country	US
Kind code	B2
Filing date	Dec 14, 2017
Priority date	Dec 14, 2017
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

In described examples of methods and control systems to control a position and/or velocity of a machine, control circuitry is coupled to receive and dither a control signal, and to compute a control output value according to the dithered control signal and a control function. An inverter is coupled to the control circuitry, to control the position and/or velocity according to the control output value.

First claim

What is claimed is:

1. A system comprising:
control circuitry having an inner velocity control loop and an outer position control loop, in which:
the inner velocity control loop has a reference velocity input and a first control output and is configured to:
responsive to the reference velocity input, generate a velocity error; and
responsive to the velocity error, control the first control output according to a control function; and

the control circuitry has a second control output and a dithering generator and is configured to control the second control output responsive to a sum of the first control output and an output of the dithering generator; and

an inverter having an input and an output, the input of the inverter coupled to the second control output, the output of the inverter adapted to be coupled to a machine, and the inverter configured to control a position of the machine and a velocity of the machine responsive to the second control output;
in which the outer position control loop has a reference position input and a machine position input, the machine position input is adapted to be coupled to the machine, and the outer position control loop is configured to control the position of the machine by causing the control circuitry to adjust the second control output responsive to the reference position input and the machine position input; and
in which the control circuitry is configured to: responsive to the machine position input, adjust the second control output according to a machine position dependent waveform shaping function.

2. The system of claim 1 , wherein the machine is a motor, and the inverter includes:
a gate driver configured to generate a pulse width modulated (PWM) switching control signal responsive to the second control output, in which the output of the inverter is an AC output, and the AC output is responsive to the PWM switching control signal.

3. The system of claim 1 , wherein the machine is a motor.

4. The system of claim 1 , wherein the machine is a motor, and the inverter includes:
a gate driver configured to generate a pulse width modulated (PWM) switching control signal responsive to the second control output, in which the output of the inverter is an AC output, and the AC output is responsive to the PWM switching control signal.

5. The system of claim 4 , wherein the control circuitry is configured to control the reference velocity input responsive to the reference position input and the machine position input.

Assignees

• Texas Instruments Inc

Inventors

• Narasimha Rajan Lakshmi
• Magee David Patrick

Classifications

• H02P6/16 Primary

  Circuit arrangements for detecting position · CPC title

• G05B19/258

  with a combination of feedback covered by G05B19/253 - G05B19/256 · CPC title

• G05B19/237

  with a combination of feedback covered by G05B19/232 - G05B19/235 · CPC title

• G05B2219/41293

  Inverter, DC-to-AC · CPC title

• G05B2219/42237

  Pwm pulse width modulation, pulse to position modulation ppm · CPC title