Systems and methods for decelerating a motor in a computer numerical controlled machine tool

A computer numerical controlled (CNC) machine tool system comprising:

• a motor drive system comprising a motor;
• a controller configured to calculate a present rate of deceleration DP for the motor based on a present speed SP of the motor, a reference speed SR of the motor, and a reference rate of deceleration DR of the motor, the controller further configured to execute an instruction for decelerating the motor from the present speed SP according to the present rate of deceleration DP,
• wherein the motor drive system comprises a maximum power rating, the maximum power rating defining a maximum power, generated by the motor while decelerating, that can be dissipated without overloading the motor drive system,
• wherein the reference rate of deceleration DR is a rate of deceleration such that power, generated by the motor while decelerating from the reference speed SR according to the reference rate of deceleration DR, is equal to the maximum power rating, and
• wherein power, generated while decelerating the motor from the present speed SP according to the present rate of deceleration DP, is equal to or less than the maximum power rating.

A controller for a computer numerical controlled (CNC) machine tool system, the controller comprising:

• a memory module containing executable instructions;
• and
• a processor configured to execute the instructions to perform a method for:
• calculating a present rate of deceleration DP for a motor of a motor drive system in a CNC machine tool based on a present speed SP of the motor, a reference speed SR of the motor, and a reference rate of deceleration DR of the motor;
• and
• decelerating the motor from the present speed SP according to the present rate of deceleration DP,
• wherein the motor drive system comprises a maximum power rating, the maximum power rating defining a maximum power, generated by the motor while decelerating, that can be dissipated without overloading the motor drive system,
• wherein the reference rate of deceleration DR is a rate of deceleration such that power, generated by the motor while decelerating from the reference speed SR according to the reference rate of deceleration DR, is equal to the maximum power rating, and
• wherein power, generated while decelerating the motor from the present speed SP according to the present rate of deceleration DP, is equal to or less than the maximum power rating.

A machine-readable medium encoded with executable instructions for decelerating a motor in a computer numerical controlled (CNC) machine tool, the instructions comprising code for:

• calculating a present rate of deceleration DP, for a motor of a motor drive system in a CNC machine tool, based on a present speed SP of the motor, a reference speed SR of the motor, and a reference rate of deceleration DR of the motor;
• and
• decelerating the motor from the present speed SP according to the present rate of deceleration DP,
• wherein the motor drive system comprises a maximum power rating, the maximum power rating defining a maximum power, generated by the motor while decelerating, that can be dissipated without overloading the motor drive system,
• wherein the reference rate of deceleration DR is a rate of deceleration such that power, generated by the motor while decelerating from the reference speed SR according to the reference rate of deceleration DR, is equal to the maximum power rating, and
• wherein power, generated while decelerating the motor from the present speed SP according to the present rate of deceleration DP, is equal to or less than the maximum power rating.