US 2025/0167719 A1 · SYSTEM AND METHOD FOR TORQUE LIMITING OF DC MACHINES

Abstract

Technical solutions are described for controlling a brushed direct current (DC) motor, including: determining, based on one of a motor current command or an actual motor current, a brush voltage drop across a set of brushes of the brushed DC motor; determining, based on the brush voltage drop, at least one of: a first torque limit based on a supply current value not exceeding a supply current limit, and a second torque limit based on a controller supply voltage value not exceeding a maximum available voltage; determining a final torque limit based on the at least one of the first torque limit and the second torque limit; determining a limited torque command based on a torque command and not to exceed the final torque limit; determining a voltage command based on the limited torque command; and applying a DC voltage to the brushed DC motor based on the voltage command.

Claims20

Dependent claims

A method of controlling a brushed direct current (DC) motor, comprising:

determining, based on one of a motor current command or an actual motor current, a brush voltage drop across a set of brushes of the brushed DC motor;
determining, based on the brush voltage drop, at least one of:
a first torque limit based on a supply current value not exceeding a supply current limit, and a second torque limit based on a controller supply voltage value not exceeding a maximum available voltage;
determining a final torque limit based on the at least one of the first torque limit and the second torque limit;
determining a limited torque command based on a torque command and not to exceed the final torque limit;
determining a voltage command based on the limited torque command;
and
applying a DC voltage to the brushed DC motor based on the voltage command.

5 more elements

A motor control system, comprising:

a brushed direct current (DC) motor having a set of brushes;
a voltage regulator configured to apply a DC voltage to the brushed DC motor based on a voltage command;
and
a controller configured to:
determine, based on one of a motor current command or an actual motor current, a brush voltage drop across the set of brushes of the brushed DC motor;
determine, based on the brush voltage drop, at least one of:
a first torque limit based on a supply current value not exceeding a supply current limit, and a second torque limit based on a controller supply voltage value not exceeding a maximum available voltage;
determine a final torque limit based on the at least one of the first torque limit and the second torque limit;
determine a limited torque command based on a torque command and not to exceed the final torque limit;
determine a voltage command based on the limited torque command;
and
transmit the voltage command to the voltage regulator.

9 more elements

Dependencies are inferred from the claim text.

System and method for torque limiting of dc machines

Life of this patent

System and method for torque limiting of dc machines

Life of this patent

Abstract

Claims20