Motorized drain cleaning machine with speed controller

A drain-cleaning machine comprising

• a) a frame assembly;
• b) a cable containing enclosure, wherein the cable containing enclosure is associated with the frame assembly for rotation about an axis of rotation, the cable containing enclosure comprising an opening in a front portion of the cable containing enclosure;
• c) a cable, wherein at least a portion of the cable is coiled within the enclosure, wherein the cable comprises an operating end configured for insertion into a drain, wherein the operating end extends through the opening in the front portion of the enclosure;
• d) an electric motor, wherein the electric motor is mounted to the frame assembly, wherein the electric motor comprises a permanent magnet motor comprising an output shaft, wherein the output shaft is in mechanical communication with the cable containing enclosure such that rotation of the output shaft results in corresponding rotation of the cable containing enclosure and the cable, wherein the electric motor is configured to operate within a range of operating speeds, wherein the range of operating speeds comprises a first operating speed and a second operating speed;
• and
• e) 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 electric motor, wherein the DC power comprises an input voltage, wherein the input voltage of the DC power is variable across a range of voltages, wherein the DC power communicated from the motor control device to the electric motor comprises an output voltage, wherein the motor control device is further configured to subject the DC power to voltage compensation by adjusting the input voltage of the DC power to correspond to a target voltage prior to adjusting the input voltage of the DC power to the output voltage;
• and
• (f) a speed control assembly, wherein the speed control assembly is in communication with the motor control device, wherein the speed control assembly is configured to control the output voltage of the DC power communicated by the motor control device to the electric motor.

A drain-cleaning machine comprising:

• a) a frame assembly, wherein the frame assembly comprises a plurality of elongated tubular members, wherein the plurality of elongated tubular members comprises
• i) a first lower support member,
• ii) a second lower support member, wherein the second lower support member comprises an elongated tubular member, wherein the first lower support member and the second lower support member are parallel to each other within a common horizontal plane,
• iii) an angled loop member extending between the first lower support member and the second lower support member,
• iv) a vertical loop member extending between the first lower support member and the second lower support member,
• v) a vertical mounting plate, wherein the vertical mounting plate is attached to the vertical loop member, wherein the vertical mounting plate comprises an opening, and
• vi) an upper support member comprising a fixed end and a free end, wherein the fixed end is attached to the vertical loop member, wherein the free end is oriented within a horizontal plane parallel to the horizontal plane containing the first lower support member and the second lower support member;
• b) a drive shaft, wherein the drive shaft extends through the opening in the vertical mounting plate,
• c) a cable, wherein the cable comprises an operating end configured to be inserted into a drain,
• d) a drum, wherein the drum is rotatably mounted to the drive shaft, wherein the drum is configured to house at least a portion of the cable, wherein the cable and the drum are configured to rotate uniformly together with drive shaft,
• e) a motor, wherein the motor comprises a permanent magnet DC electric motor, wherein the motor comprises a motor output shaft, wherein the motor operates at a plurality of discrete operating speeds, wherein the motor is configured to produce an amount of torque while operating at each of the plurality of discrete operating speeds, wherein the motor is in mechanical communication with the drive shaft such that rotation of the motor output shaft produces corresponding rotation in the drive shaft;
• f) 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 is configured to provide the DC power to the motor, wherein the DC power comprises an input voltage, wherein the input voltage of the DC power is variable across a range of voltages, wherein the DC power provided by the motor control device to the motor comprises an output voltage, wherein the motor control device is further configured to subject the DC power to voltage compensation by adjusting the input voltage of the DC power to correspond to a target voltage prior to adjusting the input voltage of the DC power to the output voltage;
• and
• g) a speed control assembly, wherein the speed control assembly is configured to determine a current operating speed for the motor, wherein the current operating speed is selected from the plurality of discrete operating speeds.