Interface between programmable electronically commutated motor and personal computer and method of operation

• US 5,473,229 A
• Filed: 04/13/1995
• Issued: 12/05/1995
• Est. Priority Date: 05/27/1992
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Beifus, Brian L., Becerra, Roger C., Archer, William R., Zick, Kenneth E.
• Primary Examiner(s): Wysocki, Jonathan
• Application Number:
  US08/421,291
• Time in Patent Office: 236 Days
• Field of Search: 318/254, 318/439, 318/138, 318/778, 318/782, 318/783, 318/798-815, 318/471, 318/641, 73/660, 73/862.045, 73/862.06, 73/862.08, 73/862.16, 73/862.18, 73/862.27, 73/862.193, 364/480, 364/483, 364/556, 364/557, 364/424.01, 364/551.01, 364/552
• US Class Current: 318/400.18
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/56 Remote control
• CPC Class Codes: F24F 11/64 using pre-stored data
• CPC Class Codes: F24F 11/88 Electrical aspects, e.g. circuits
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2140/00 Control inputs relating to system states
• CPC Class Codes: F24F 2140/50 Load
• CPC Class Codes: H02P 6/085 in a bridge configuration

Abstract

A microcontroller with external memory interacts with a host computer or terminal via a fully isolated RS232 serial interface. An eight-bit D/A converter transforms signals generated digitally in the microcontroller. The low level analog signal at the D/A output is further amplified in a power amplifier which supplies a signal to the motor terminals of the motor to be programmed via solid state relays. The solid state relays form an array of switches which are selectively closed by a low level digit signal generated by the microcontroller and processed by digital circuits. Four signals may be modulated with a signal representing the line frequency and are used specifically in an emulation mode. The interface receives multi-function feedback signals (RPM) from the motor such as speed, memory, content, and diagnostic information. Comparators provide an integrity check of the connections (cable) and the input section of the motor (optocouplers). The comparators compare voltages and currents of a selected motor signal against pre-defined threshold levels.

Claims

1. An interface for programming a motor having a programmable nonvolatile (PNV) memory storing motor operating parameters which control the motor operation and having a motor control for operating the motor in accordance with the stored motor operating parameter and in response to motor operating signals, said interface for operating the programmed motor to emulate performance of the motor driving a component in a specific environment in order to achieve a desired motor performance, said motor having a motor input for accessing the motor operating parameters stored in the PNV memory and for receiving motor operating signals provided to the motor control for operating the motor, said interface for use with operator input means responsive to operator input for providing output signals representative of desired motor operating parameters for calibrating the motor and for specifying desired motor operating signals for emulating operation of the motor in the specific environment, said interface comprising:

an input port connected to the operator input means and receiving the output signals;

an output port connected to and engaging the motor input; and

means for storing the motor operating parameters for calibrating the motor in the PNV memory via the interface output port and via the motor input;

means for providing the motor operating signals for emulating motor operation to the motor control via the interface output port and via the motor input;

means for measuring an output performance of the motor in response to the motor operating signals; and

wherein the interface circuit is responsive to the operator input for varying the motor operating parameters so that the output performance as measured by the measuring means corresponds to the desired motor performance whereby motor operation, as controlled by the motor operating parameters in the PNV memory, is in response to the operator input provided via the input means so that the motor operation emulates the desired performance when driving the component in the specific environment.

2. The interface of claim 1 wherein the means for storing the motor operating parameters comprises:

a processor having an input for receiving signals from the input means from the computer;

a memory connected to the processor and including instructions for controlling the operation of the processor; and

a circuit, response to the processor, for generating programming signals provided to the motor input which correspond to the motor operating parameters.

3. The interface of claim 2 wherein the programming signal generating circuit comprises an amplifier generating an output signal, an array of switches having inputs connected to the amplifier for receiving the output signal and having outputs connected to the motor, and means for selectively opening and closing the switches in response to data signals provided by the processor.

4. The interface of claim 3 wherein the amplifier comprises a digital-to-analog converter for converting digital signals provided by the processor and means for amplifying the analog signals provided by the converter thereby providing an amplified signal to the inputs of the switches.

5. The interface of claim 1 further comprising a high frequency, low-voltage power supply for generating a power signal for powering the motor.

6. The interface of claim 5 wherein the motor operates with a 115/230 vac line voltage and wherein the high frequency, low voltage power supply supplies a ±

24 volt quasi-square wave oscillating at a frequency of 1 kHz.

7. The interface of claim 2 wherein the interface input port and the computer output each comprises an RS232 serial communication port, and further comprising an isolated, dual power supply to power a driver of the RS232 ports.

8. The interface of claim 7 wherein the isolated power supply has a floating ground.

9. The interface of claim 8 further comprising an array of optocouplers interconnecting the computer output and the processor input.

10. The interface of claim 1 further comprising means for verifying an electrical integrity of the connection between the interface output port and the motor input.

11. The interface of claim 10 wherein the verifying means comprises a circuit for testing whether the electrical connection between the interface output port and the motor input provides an open circuit or a closed circuit.

12. The interface of claim 11 wherein the testing circuit comprises means for impressing a voltage on one or more lines between the interface output port and the motor input and means for detecting the impressed voltage.

13. The interface of claim 11 wherein the circuit comprises means or detecting current on one or more lines between the interface output port and the motor input.

14. The interface of claim 1 further comprising means for printing labels indicating the motor operating parameters with which the PNV memory of the motor has been programmed.

15. The interface of claim 1 further comprising means for providing motor operating signals to the motor, said motor operating signals for operating the motor to emulate performance of the motor in a specific environment in order to achieve a desired motor performance.

16. The interface of claim 1 wherein the measuring means comprises a dynamometer.

17. A method for programming a motor having a programmable nonvolatile (PNV) memory storing motor operating parameters which control the motor operation and having a motor control for operating the motor in accordance with the stored operating parameters and in response to motor operating signals, providing an interface for operating the programmed motor to emulate performance of the motor driving a component in a specific environment in order to achieve a desired motor performance, said motor having a motor input for accessing the motor operating parameters stored in the PNV memory and for receiving motor operating signals provided to the motor control for operating the motor, said method comprising the steps of:

providing an interface for operating the programmed motor to emulate performance of the motor driving a component in a specific environment in order to achieve a desired motor performance;

providing to an input port of said interface circuit output signals representative of desired operating parameters for calibrating the motor and for specifying desired motor operating signals for emulating operation of the motor in the specific environment;

interconnecting the motor input and the output port of the interface circuit;

storing the motor operating parameters for calibrating the motor in the PNV memory via the interface output port and via the motor input;

providing motor operating signals for emulating motor operation to the motor control via the interface output port and via the motor input; and

measuring an output performance of the motor in response to the motor operating signals;

wherein the interface circuit is responsive to the operator input for varying the motor operating parameters so that the measured output performance corresponds to the desired motor performance whereby motor operation, as controlled by the motor operating parameters in the PNV memory, is in response to the operator input provided so that the motor operation emulates the desired performance when driving the component in the specific environment.

18. The method of claim 17 wherein the interface circuit comprises:

a processor having an input for receiving the output signals representative of the operator input;

a memory connected to the processor and including instructions for controlling the operation of the processor; and

a circuit, responsive to the processor, for generating programming signals provided to the motor input which correspond to the motor operating parameters.

19. The method of claim 17 further comprising the step of verifying an electrical integrity of the interconnection between the motor input and the output port of the interface circuit.

20. The method of claim 17 further comprising the step of printing labels indicating the motor operating parameters with which the PNV memory of the motor has been programmed.

21. A method for programming a motor and operating the programmed motor to emulate performance of the motor driving a component in a specific environment in order to achieve a desired motor operating performance, said method comprising the steps of:

connecting a motor in driving relation to the component in the specific environment, said motor having a programmable, non-volatile (PNV) memory storing motor operating parameters which control the motor operation and having a motor control for operating the motor in accordance with the stored motor operating parameters and in response to motor operating signals, said motor having a motor input for accessing the motor operating parameters stored in the PNV memory and for receiving the motor operating signals provided to the motor control for operating the motor;

specifying in response to operator input desired motor operating parameters for calibrating the motor and for specifying desired motor operating signals for emulating operation of the motor in the specific environment;

providing output signals representative of the desired motor operating parameters as defined by the operator input and the desired motor operating signals as defined by the operator input;

providing an interface circuit having an input port receiving the output signals and having an output port connected to and engaging the motor input;

storing the motor operating parameters for calibrating the motor in the PNV memory via the interface output port-and via the motor input; and

providing the motor operating signals for emulating motor operation to the motor control via the interface output port and via the motor input;

measuring an output performance of the motor in response to motor operating signals; and

wherein the interface circuit is responsive to the operation input for varying the motor operating parameters so that the output performance as measured by the measuring step corresponds to the desired motor performance whereby the motor operation is controlled in accordance with the stored motor operating parameters in the PNV memory in response to the motor operating signals as defined by operator input so that the motor operation emulates the desired performance when driving the component in the specific environment.

22. The method of claim 21 further comprising indicating by means for indicating the motor operating parameters with which the PNV memory of the motor has been programmed whereby the means for indicating indicates the desired motor operating parameters corresponding to the desired performance.

23. A system for programming a motor and operating the programmed motor to emulate performance in a specific environment in order to achieve a desired motor performance, said system comprising:

a motor connected in driving relation to a component in the specific environment, said motor having a programmable, non-volatile (PNV) memory storing motor operating parameters which control the motor operation and having a motor control for operating the motor in accordance with the stored motor operating parameters and in response to motor operating signals, said motor having a motor input for accessing the motor operating parameters stored in the PNV-memory and for receiving motor operating signals provided to the motor control for operating the motor;

a computer having input means responsive to operator input specifying desired motor operating parameters for calibrating the motor and for specifying desired motor operating signals for emulating operation of the motor in the specific environment and having an output providing computer output signals representative of the desired motor operating parameters as defined by the operator input and the desired motor operating signals as defined by the operator input; and

an interface circuit having an input port connected to the computer output and receiving the computer output signals, said interface circuit having an output port connected to and engaging the motor input, said interface circuit having means for storing the motor operating parameters for calibrating the motor in the PNV memory via the interface output port and via the motor input, and said interface circuit having means for providing the motor operating signals for emulating motor operation to the motor control via the interface output port and via the motor input;

means for measuring an output performance of the motor in response to motor operating signals; and

wherein the interface circuit is responsive to the operator input for varying the motor operating parameters so that the output performance as measured by the measuring means corresponds to the desired motor performance whereby the motor operation is controlled in accordance with the stored motor operating parameters in the PNV memory in response to the motor operating signals as defined by operator input provided via the input means so that the motor operation emulates the desired performance when driving the component in the specific environment.

24. The system of claim 23 further comprising means for indicating the motor operating parameters with which the PNV memory of the motor has been programmed whereby the means for indicating indicates the desired motor operating parameters corresponding to the desired performance.