System, apparatus, and method for controlling a motor

• US 9,337,707 B2
• Filed: 01/21/2014
• Issued: 05/10/2016
• Est. Priority Date: 01/28/2013
• Status: Active Grant

• Current Assignee: Shaw Dixon, LLC
• Original Assignee: Shaw Dixon, LLC
• Inventors: Dixon, Randy J.
• Primary Examiner(s): Ip, Paul
• Application Number:
  US14/160,357
• Publication Number:
  US 20140210321A1
• Time in Patent Office: 840 Days
• Field of Search: 318/400.01, 318/400.04, 318/400.05, 318/400.08, 318/490, 318565-569, 318/400.07
• US Class Current: 1/1
• CPC Class Codes: H02K 11/0094 Structural association with other electrical or electronic devices
• CPC Class Codes: H02K 11/22 Optical devices
• CPC Class Codes: H02K 11/28 Manual switches
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 11/35 Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
• CPC Class Codes: H02K 2213/09 Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators
• CPC Class Codes: H02K 5/12 specially adapted for operating in liquid or gas combined with cooling arrangements H02K9/00
• CPC Class Codes: H02K 5/136 explosion-proof
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence
• CPC Class Codes: H02P 6/06 Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed

Abstract

Mechanisms are provided to control the operation of a motor. In particular, a variable frequency drive motor controller is described which resides within a motor housing. Additionally, the speed at which the motor operates is based on a signal received from a Hall Effect switch or from a communication device in communication with a remote interface. The Hall Effect switch is also described; in particular, the Hall Effect switch features a magnet rotatably connected with one side of a motor housing. A Hall Effect sensor, located on the opposite side of the motor housing, detects the position of the magnet and outputs a signal to the motor controller, located within the motor housing, indicating the detected magnet position. Additional operating features are described relating to the safe operation and control of the motor in potentially hazardous environments.

Claims

1. A motor comprising:

a motor housing enclosing a rotor and stator including one or more windings;

a current sensor;

a temperature sensor;

a sensor configured to provide an indication of operation by measuring at least one of a rate at which the motor operates, an amount of torque provided by the motor, and an amount of power consumed by the motor; and

a variable frequency drive controller disposed within the motor housing, wherein the variable frequency drive controller includes;

a motor control circuit having a system operating profile including a current threshold for the current sensor and a temperature threshold for the temperature sensor,

at least one three-phase bridge driver circuit electrically coupled to the one or more windings, and

a remote communication interface configured to wirelessly communicate with one or more servers using a communication network,

wherein the motor control circuit is configured to wirelessly access a selected system operating profile from a plurality of system operating profiles located at the one or more servers via the remote communication interface, wirelessly receive an operating parameter, a current threshold for the current sensor, and a temperature threshold for the temperature sensor from the one or more servers based on the selected system operating profile located at the one or more servers, update the current threshold and the temperature threshold within the system operating profile of the motor control circuit based on the wirelessly received current threshold and temperature threshold respectively, compare the indication of operation received from the sensor to the wirelessly received operating parameter, and increase or decrease one or more of a rate at which the motor operates and an amount of torque the motor provides by adjusting a pulse width modulated signal provided to the three-phase bridge driver circuit based on (i) the comparison between the indication of operation received from the sensor and the wirelessly received operating parameter, (ii) a comparison between the current threshold for the current sensor and a current indication received from the current sensor, and (iii) a comparison between the temperature threshold for the temperature sensor and a temperature indication received from the temperature sensor.

2. The motor of claim 1, wherein the operating parameter is adjusted in response to the current indication received from the current sensor exceeding the current threshold for the current sensor.

3. The motor of claim 2, wherein the operating parameter is adjusted in response to the temperature indication received from the temperature sensor exceeding the temperature threshold for the temperature sensor.

4. The motor of claim 3, wherein the motor control circuit is configured to wirelessly receive a second temperature threshold for the temperature sensor and cause the rotor of the motor to stop turning in response to the temperature indication received from the temperature sensor exceeding the second temperature threshold for the temperature sensor.

5. The motor of claim 1, wherein the motor housing comprises at least one of aluminum, copper, plastic, carbon fiber, and non-magnetic stainless steel.

6. The motor of claim 1, further comprising:

a hall effect switch including a hall effect sensor and a magnet, the hall effect sensor disposed such that at least a portion of the motor housing is sandwiched between the hall effect sensor and the magnet, wherein the hall effect switch provides a signal to the motor control circuit, wherein the signal is based on a position of the magnet with respect to the hall effect sensor, and wherein the motor control circuit is configured to increase or decrease one or more of a rate at which the motor operates and an amount of torque the motor provides by adjusting the pulse width modulated signal provided to the three-phase bridge driver circuit based on the signal received from the hall effect sensor.

7. The motor of claim 1, wherein the motor control circuit is configured to receive an amount of torque currently provided by the motor, determine an amount of additional torque that can be provided by the motor based on received measurements related to one or more of current, voltage, and rate, and adjust the pulse width modulated signal provided to the three-phase bridge driver circuit based on the determined amount of additional torque.

8. A motor and control system comprising:

a motor housing enclosing rotor and stator including one or more windings;

a current sensor;

a temperature sensor;

a sensor configured to provide an indication of operation by measuring at least one of a rate at which the motor operates, an amount of torque provided by the motor, and an amount of power consumed by the motor; and

a variable frequency drive controller disposed within the motor housing, wherein the variable frequency drive controller includes;

a motor control circuit having a system operating profile including a current threshold for the current sensor and a temperature threshold for the temperature sensor,

a remote communication interface configured to wirelessly communicate with one or more servers using a communication network,

wherein the motor control circuit is configured to wirelessly access a selected system operating profile from a plurality of system operating profiles located at the one or more servers via the remote communication interface, wirelessly receive a current threshold for the current sensor and a temperature threshold for the temperature sensor from the one or more servers based on the selected system operating profile located at the one or more servers, update the current threshold and the temperature threshold within the system operating profile of the motor control circuit based on the wirelessly received current threshold and temperature threshold respectively, wirelessly receive at least one operating parameter relating to the operation of the motor and control system from at least one communication device other than the one or more servers via the remote communication interface, compare the indication of operation received from the sensor to the wirelessly received operating parameter, and increase or decrease one or more of a rate at which the motor operates and an amount of torque the motor provides based on (i) the comparison between the indication of operation received from the sensor and the wirelessly received operating parameter, (ii) a comparison between the current threshold for the current sensor and a current indication received from the current sensor, and (iii) a comparison between the temperature threshold for the temperature sensor and a temperature indication received from the temperature sensor.

9. The motor and control system of claim 8, wherein the motor is an electric direct current brushless motor.

10. The motor and control system of claim 8, wherein the motor housing comprises at least one of aluminum, copper, plastic, carbon fiber, and non-magnetic stainless steel.

11. The motor and control system of claim 8, wherein the operating parameter is adjusted in response to the current indication received from the current sensor exceeding the current threshold for the current sensor.

12. The motor and control system of claim 11, wherein the operating parameter adjusted in response to the temperature indication received from the temperature sensor exceeding the temperature threshold for the temperature sensor.

13. The motor and control system of claim 12, wherein the motor control circuit is configured to wirelessly receive a second temperature threshold for the temperature sensor and cause the rotor of the motor to stop turning in response to the temperature indication received from the temperature sensor exceeding the second temperature threshold for the temperature sensor.

14. The motor and control system of claim 8, wherein the motor housing is cylindrical and the variable frequency drive controller resides within the cylindrical housing.

15. The motor and control system of claim 14, wherein the motor housing is formed from a single piece of material.

16. The motor and control system of claim 8, wherein the motor and control system comprises an explosion-proof motor.

17. The motor and control system of claim 8, wherein the motor and control system comprises a non-explosion-proof motor.

18. The motor and control system of claim 8, further comprising:

a hall effect switch including a hall effect sensor and a magnet, the hall effect sensor disposed such that at least a portion of the motor housing is sandwiched between the hall effect sensor and the magnet, wherein the hall effect switch provides a signal to the motor control circuit, wherein the signal is based on a position of the magnet with respect to the hall effect sensor, and wherein the motor control circuit is configured to increase or decrease one or more of a rate at which the motor operates and an amount of torque the motor provides based on the signal received from the hall effect sensor.

19. The motor and control system of claim 8, wherein the motor control circuit is configured to receive an amount of torque currently provided by the motor, determine an amount of additional torque that can be provided by the motor based on received measurements related to one or more of current, voltage, and rate, and adjust a pulse width modulated signal provided to a three-phase bridge driver circuit based on the determined amount of additional torque.

20. A method of controlling a motor, the method comprising:

wirelessly accessing, by a motor control circuit, a selected system operating profile from a plurality of system operating profiles located at one or more servers via a remote communication interface;

wirelessly receiving, by the motor control circuit, a current threshold for a current sensor and a temperature threshold for a temperature sensor from the one or more servers based on the selected system operating profile located at the one or more servers;

updating, by the motor control circuit, the current threshold and the temperature threshold within a system operating profile of the motor control circuit based on the wirelessly received current threshold and temperature threshold respectively;

wirelessly receiving, by the motor control circuit, at least one operating parameter relating to the operation of the motor received from at least one communication device other than the one or more servers;

comparing, by the motor control circuit, an indication of operation received from a sensor to the wirelessly received operating parameter; and

increasing or decreasing, by the motor control circuit, one or more of a rate at which the motor operates and an amount of torque the motor provides based on (i) the comparison between the indication of operation received from the sensor and the wirelessly received operating parameter, (ii) a comparison between the current threshold for the current sensor and a current indication received from the current sensor, and (iii) a comparison between the temperature threshold for the temperature sensor and a temperature indication received from the temperature sensor.

21. The method of controlling a motor according to claim 20, wherein the motor is an electric direct current brushless motor and a motor housing comprises at least one of aluminum, copper, plastic, carbon fiber, and non-magnetic stainless steel and encloses the motor control circuit.