System and method for measuring parameters of a DC motor field

A system for determining at least one parameter of a field of a DC motor, the system comprising:

• a processing portion that obtains parameters of the DC motor, the processing portion performing an iterative processing loop, the iterative processing loop being performed n times, the iterative processing loop including:
• regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current;
• operating in a closed loop mode to determine a first field firing angle and a second field firing angle;
• operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle;
• and
• determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.

A system for determining at least one parameter of a field of a DC motor, the system comprising:

• means for obtaining parameters of the DC motor;
• and
• means for performing an iterative processing loop, the iterative processing loop being performed n times, the iterative processing loop including:
• regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current;
• operating in a closed loop mode to determine a first field firing angle and a second field firing angle;
• operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle;
• and
• determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.

A method for determining at least one parameter of a field of a DC motor, the method comprising:

• obtaining parameters of the DC motor;
• and
• performing an iterative processing loop, the iterative processing loop being performed n times, the iterative processing loop including:
• regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current;
• operating in a closed loop mode to determine a first field firing angle and a second field firing angle, the operating in a closed loop mode including:
• regulating the current to a first high point current and measuring a first field firing angle required to obtain the first high point current;
• and
• regulating the current to a first low point current and measuring a second field firing angle required to obtain the first low point current;
• operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle, the operating in an open loop mode including:
• setting an open loop firing command to the second field firing angle;
• stepping the open loop firing command to the first field firing angle and measuring the first time constant based on field current rate of change;
• and
• stepping the open loop firing command back to the second field firing angle and measuring the second time constant based on field current rate of change;
• and
• determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.

A system for determining at least one parameter of a field of a DC motor, the system comprising:

• a processing portion that obtains parameters of the DC motor, the processing portion performing an iterative processing loop, the iterative processing loop being performed n times, the iterative processing loop including:
• regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current;
• operating in a closed loop mode to determine a first field firing angle and a second field firing angle, the operating in a closed loop mode including:
• regulating the current to a first high point current and measuring a first field firing angle required to obtain the first high point current;
• and
• regulating the current to a first low point current and measuring a second field firing angle required to obtain the first low point current;
• operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle, the operating in an open loop mode including:
• setting an open loop firing command to the second field firing angle;
• stepping the open loop firing command to the first field firing angle and measuring the first time constant based on field current rate of change;
• and
• stepping the open loop firing command back to the second field firing angle and measuring the second time constant based on field current rate of change;
• and
• determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.

A system for determining at least one parameter of a field of a DC motor, the system comprising:

• means for obtaining parameters of the DC motor;
• and
• means for performing an iterative processing loop, the iterative processing loop being performed n times, the iterative processing loop including:
• regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current;
• operating in a closed loop mode to determine a first field firing angle and a second field firing angle, the operating in a closed loop mode including:
• regulating the current to a first high point current and measuring a first field firing angle required to obtain the first high point current;
• and
• regulating the current to a first low point current and measuring a second field firing angle required to obtain the first low point current;
• operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle, the operating in an open loop mode including:
• setting an open loop firing command to the second field firing angle;
• stepping the open loop firing command to the first field firing angle and measuring the first time constant based on field current rate of change;
• and
• stepping the open loop firing command back to the second field firing angle and measuring the second time constant based on field current rate of change;
• and
• determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.