초록 ▼

A motor control system for use in heating, ventilation and air conditioning applications including a blower and a motor coupled to drive the blower, an inverter coupled to provide energization to the motor, a relay capable of coupling the motor to the output of the inverter or to line power, and a c

A motor control system for use in heating, ventilation and air conditioning applications including a blower and a motor coupled to drive the blower, an inverter coupled to provide energization to the motor, a relay capable of coupling the motor to the output of the inverter or to line power, and a controller providing signals to control the output of the inverter, where, upon startup and transfer of the motor from the line to the inverter, the output of the inverter is controlled by the inverter to provide for an enhanced startup or transfer.

대표청구항 ▼

1. A motor control system for use in heating, ventilation, and air conditioning applications comprising:a blower and a motor coupled to drive the blower; an inverter coupled to provide energization to the motor, the inverter receiving line power at line frequency and a controller coupled to the inve

1. A motor control system for use in heating, ventilation, and air conditioning applications comprising:a blower and a motor coupled to drive the blower; an inverter coupled to provide energization to the motor, the inverter receiving line power at line frequency and a controller coupled to the inverter, the controller providing signals to control the output of the inverter and wherein, upon startup of the motor the controller: (i) controls the inverter to drive the output of the inverter to a predetermined voltage level and to a predetermined frequency, the predetermined frequency being greater than line frequency; (ii) the controller controls the inverter to maintain the output of the inverter at or near the predetermined voltage and the predetermined frequency for a predefined period of time; and (iii) upon the conclusion of the predetermined period of time, the controller controls the inverter to drive one output parameter of the inverter to a desired set point value. 2. The motor control system of claim 1 wherein the predetermined voltage level is between 30% and 70% of the voltage available to the inverter.3. The motor control system of claim 1 wherein the predetermined frequency is approximately 74 Hz.4. The motor control system of claim 1 wherein the controller provides signals to control the output of the inverter in response to received input control signals, wherein the input control signals received by the controller can define a first operating state and a second operating state and wherein, in response to the input control signals defining the first operating state, the controller controls the output of the inverter in accordance with a first volts vs. hertz relationship and wherein, in response to the input control signals defining the second operating state, the controller controls the output of the inverter in accordance with a second volts vs. hertz relationship, the first volts vs. hertz relationship being different than the second volts. vs. hertz relationship.5. The control system of claim 1 wherein each operating state corresponds to a desired current level in the motor.6. The control system of claim 1 wherein the controller provides output signals to control the output of the inverter in response to received input control signals and in response to field adjustment signals, wherein the input control signals can define a first and a second operating state of the controller, each of the first and second operating states corresponding to a desired operating state of the system; and a first field adjustment circuit for providing a first field adjustment signal to the controller, the first field adjustment signal, in combination with the input control signals, defining a desired output power level for the inverter for the first operating state.7. The control system of claim 6 wherein, in response to the input control signals defining the first operating state, the controller controls the output of the inverter in accordance with a first volts vs. hertz relationship and wherein, in response to the input control signals defining the second operating state, the controller controls the output of the inverter in accordance with a second volts vs. hertz relationship, the first volts vs. hertz relationship being different than the second volts. vs. hertz relationship.8. A motor control system for use in heating, ventilation and air conditioning applications comprising:a blower and a motor coupled to drive the blower; an inverter coupled to provide energization to the motor; and a controller coupled to the inverter, the controller providing signals to control the output of the inverter; a relay having a first input coupled to receive line power, a second input coupled to receive the output of the inverter, an output coupled to the motor; and a control input coupled to receive a control signal controlled by the controller wherein the controller controls the relay to cause the motor to be energized by line power when the desired frequency for energization of the motor as defined by the controller in response to the input control signals is at or near line frequency; and wherein, prior to switching the relay from a state where the motor is being energized by the inverter to a state where the motor is being energized by the line the controller will: (i) first control the output of the inverter such that the voltage level of the inverter output is approximately equal to the maximum voltage level available to the inverter and the frequency output of the inverter is approximately equal to the line frequency; (ii) thereafter control the output of the inverter such that the inverter does not provide any power to the motor for a defined period of time; and (iii) thereafter generate a signal to cause the relay to change states so as to couple the motor to line power. 9. A motor control system for use in heating, ventilation and air conditioning applications comprising:a blower and a motor coupled to drive the blower; an inverter coupled to provide energization to the motor; and a controller coupled to the inverter, the controller providing signals to control the output of the inverter; a relay having a first input coupled to receive line power, a second input coupled to receive the output of the inverter, an output coupled to the motor; and a control input coupled to receive a control signal controlled by the controller wherein the controller controls the relay to cause the motor to be energized by line power when the desired frequency for energization of the motor as defined by the controller in response to the input control signals is at or near line frequency; and wherein in switching the relay from a state where the motor is being energized by the line to a state where the motor is being energized by the inverter the controller will: (i) before switching the relay to couple the inverter output to the motor, generate control signals to cause the output of the inverter to be at a defined frequency that is approximately equal to the line frequency and at a defined voltage level between 30% and 70% of the normal output voltage of the inverter at the defined frequency; (ii) thereafter switching the relay to couple the motor to the output of the inverter; and (iii) control the inverter to cause the voltage level of the inverter output to increase from the defined voltage level to the normal output voltage of the inverter at the defined frequency. 10. The motor control system of claim 9 wherein the defined voltage level is approximately one-half of the normal output of the inverter.11. The motor control system of claim 9 further including:a generally L-shaped bracket assembly; a lid element adapted to be coupled to the curved exterior of a blower housing, the generally lid element being hingedly coupled to the generally L-shaped bracket assembly; and a control module containing circuit components for an inverter and an electronic controller, mounted to the generally L-shaped bracket assembly such that, when the L-shaped bracket assembly is in a first position wherein the L-shaped bracket assembly makes contact with the lid assembly, access to the control module is blocked by the bracket assembly, and when the L-shaped bracket assembly is swung open along the hinged connection access to the control module is enabled.