| 主权项 |
1) A drain-cleaning machine comprising:
a) a cable, wherein the cable comprises a longitudinal axis; and b) a motor assembly, wherein the motor assembly is in mechanical communication with the cable, wherein the motor assembly is configured to rotate the cable about the longitudinal axis of the cable, wherein the motor assembly comprises
i) a motor, wherein the motor is configured to operate at an operating speed, wherein the operating speed may vary within a range of operating speeds, wherein the motor is configured to produce substantially constant torque while operating at varying operating speeds across the entire range of operating speeds, wherein the motor is configured to be powered by DC power, andii) a motor control device, wherein the motor control device is mounted to the motor, wherein the motor control device is configured to receive AC power from an AC power source, wherein the motor control device is configured to convert the AC power into DC power, wherein the motor control device communicates the DC power to the motor; and c) a speed control assembly, wherein the speed control assembly is in communication with the motor assembly, wherein the speed control assembly is configured to vary the operating speed of the motor within the range of operating speeds. |
