Motor controller

A converter module which receives an AC voltage, converts the AC voltage to a DC voltage, and outputs the DC voltage to a circuit for driving a motor, comprising:

• a switching device;
• a diode;
• and
• a control circuit which controls the DC voltage output by the converter module by controlling the switching device;
• wherein the control circuit includes:
• a circuit which outputs a plurality of DC voltage command values respectively corresponding to a plurality of different DC voltages to be output by the converter module;
• a selector which selects one of the DC voltage command values in accordance with an external signal indicative of a speed of the motor, and outputs the selected DC voltage command value;
• and
• a controller which controls the DC voltage output by the converter module in accordance with the selected DC voltage command value output by the selector.

A converter module which receives an AC voltage, converts the AC voltage to a DC voltage, and outputs the DC voltage to a circuit for driving a motor, comprising:

• a converter circuit including a rectifier and a chopper, the rectifier receiving an AC input voltage and producing an output, the chopper receiving the output of the rectifier and producing a DC voltage, the chopper including a reactor, a switching device, and a diode;
• a first control circuit including
• a plurality of DC voltage detection terminals which detect the DC voltage produced by the chopper with respective different DC voltage detection gains, and
• a selector which selects at least one of the DC voltage detection terminals in accordance with an external signal indicative of a speed of the motor, and outputs a DC voltage detection value;
• and
• a second control circuit which receives the DC voltage detection value output by the selector from the first control circuit, and controls the switching device in accordance with the DC voltage detection value, thereby controlling the DC voltage produced by the chopper.

A motor controller comprising:

• a converter circuit, including a rectifier circuit, which converts an input voltage to a DC voltage using a switching operation and an energy storing effect of an inductance, and outputs the DC voltage;
• a DC voltage control circuit which controls the DC voltage output from the converter circuit;
• an inverter circuit which receives the DC voltage output from the converter circuit and drives a motor in accordance with the DC voltage output from the converter circuit;
• a converter control circuit which controls the converter circuit;
• and
• an inverter control circuit which controls the inverter circuit;
• wherein the DC voltage control circuit changes the DC voltage output from the converter from a first DC voltage to a second DC voltage different from the first DC voltage when a speed of the motor reaches a predetermined state in accordance with a state of a load of the motor.

A motor controller comprising:

• a converter circuit, including a rectifier circuit, which converts an input voltage to a DC voltage using a switching operation and an energy storing effect of an inductance, and outputs the DC voltage;
• a DC voltage control circuit which controls the DC voltage output from the converter circuit;
• an inverter circuit which receives the DC voltage output from the converter circuit and drives a motor in accordance with the DC voltage output from the converter circuit;
• a converter control circuit which controls the converter circuit;
• an inverter control circuit which controls the inverter circuit in response to an input signal;
• and
• a DC voltage pulsation correcting circuit which detects pulsating components of the DC voltage output from the converter, and changes the input signal of the inverter control circuit in accordance with the detected pulsating components.