Rotation drive control circuit of multiphases direct current motor and the start-up method thereof

A method of starting up a three-phase DC motor including three-phase coils and a rotor, comprising:

• generating a first current to flow through each of any two phases of the three-phase coils to detect a polarity of an induced voltage induced in a de-energized phase of the three-phase coils by a drive control unit driving and controlling the three-phase DC motor, thereby determining a direction of energization and corresponding two phase coils through which a second current flows to rotate the rotor;
• based upon determining that any two detected levels of the induced voltages are larger than a predetermined level, determining the direction of energization and the corresponding two phase coils by using two detected polarities of the induced voltages in connection with said any two detected levels thereby rotating the rotor based upon the direction of energization and the corresponding two phase coils thereof are determined;
• and
• driving the three-phase DC motor based upon a first determination in connection with the direction of the energization and the corresponding two phase coils,
• wherein the rotor does not response by the first current, and
• wherein when the drive control unit determinates that said any two detected levels in connection with the induced voltages are larger than the predetermined level, the drive control unit determines the direction of the energization and the corresponding two phase coils by ignoring a detection result of a polarity of an induced voltage of the de-energized phase of the three-phase coils whose induced voltage is smaller than the predetermined level.

A rotation drive control system of a three-phase DC motor comprising:

• a drive control unit including a driver, a current detection unit, a PWM signal generator and a vector controller;
• the PWM signal generator including a triangular wave generator, and a comparison unit;
• and
• a three-phase DC motor including three-phase coils and a rotor,
• wherein the drive control unit generates a current command value,
• wherein the current detection unit executes a current detection of a current which flows through the three-phase coils,
• wherein the vector controller generates a first indicative voltage corresponding to a first phase of the three-phase coils, a second indicative voltage corresponding to a second phase of the three-phase coils and a third indicative voltage corresponding to a third phase of the three-phase coils by detecting a difference between a result of the current detection and the current command value,
• wherein the PWM signal generator generates and outputs a first PWM signal, a second PWM signal, and a third PWM signal,
• wherein the driver drives the three-phase DC motor based on the first PWM signal, the second PWM signal, and the third PWM signal,
• wherein the triangular wave generator generates a positive phase triangular wave and a negative phase triangular wave, and
• wherein when the first indicative voltage is an intermediate potential between a voltage value of the second indicative voltage and a voltage value of the third indicative voltage and changes between the voltage values of the second and third indicative voltages, the first PWM signal is generated by the comparison unit which compares the negative phase triangular wave with the first indicative voltage, and the second PWM signal is generated by the comparison unit which compares the positive phase triangular wave with the second indicative voltage,
• wherein when the second indicative voltage is an intermediate potential between a voltage value of the first indicative voltage and a voltage value of the third indicative voltage and changes between the voltage values of the first and third indicative voltages, the second PWM signal is generated by the comparison unit which compares the negative phase triangular wave with the second indicative voltage, and the first PWM signal is generated by the comparison unit which compares the positive phase triangular wave with the first indicative voltage.

A rotation drive control device of three-phase DC motor, comprising:

• a drive control unit;
• and
• a three-phase DC motor including three-phase coils and a rotor,
• wherein the drive control unit generates a first current that flows through each of any two phases of the three-phase coils to detect a polarity of an induced voltage induced in a de-energized phase of the three-phase coils so as to determine a direction of energization and corresponding two phase coils through which a second current flows to rotate the rotor,
• wherein the drive control unit controls a start-up of the three-phase DC motor based upon a first determination in connection with the direction of energization and the corresponding two phase coils,
• wherein the rotor does not respond to the first current,
• wherein when the drive control unit determines that any two detected levels of the induced voltages are larger than a predetermined level, the drive control unit determines the direction of energization and the corresponding two phase coils by using two detected polarities of the induced voltages in connection with said any two detected levels, so as to rotate the rotor based upon the direction of energization and the corresponding two phase coils thereof are determined, and
• wherein when the drive control unit determinates that said two detected levels of the induced voltages are larger than the predetermined level, the drive control unit determines the direction of the energization and the corresponding two phase coils by inverting a detection result of a polarity of an induced voltage of a de-energized phase of the three-phase coils whose induced voltage is smaller than the predetermined level.

A rotation drive control device of a three-phase DC motor comprising:

• a three-phase DC motor including three-phase coils and a rotor,
• a drive unit which generates a first current that flows through two phases of the three-phase coils to detect a polarity of an induced voltage in a de-energized phase of the three-phase coils;
• and
• a magnetic pole position detecting unit which determines a direction of energization and corresponding two phase coils by using any two detected levels in connection with the induced voltages in any two phase coils of the three-phase DC motor, when the magnetic pole position detecting unit determines that said any two detected levels are larger than a reference level,
• wherein through the corresponding two phase coils, a second current flows to rotate the rotor, and
• wherein when the drive control unit determinates that said two detected levels of the induced voltages are larger than the predetermined level, the drive control unit determines the direction of the energization and the corresponding two phase coils by inverting a detection result of a polarity of an induced voltage of the de-energized phase of the three-phase coils whose induced voltage is smaller than the predetermined level.

A rotation drive control device of a three-phase DC motor, comprising:

• a three-phase DC motor including three-phase coils and a rotor,
• a drive unit which generates a first current that flows through two phases of the three-phase coils to detect a polarity of an induced voltage in a de-energized phase of the three-phase coils;
• and
• a magnetic pole position detecting unit which determines a direction of energization and corresponding two phase coils by using any two detected levels in connection with the induced voltages in any two phase coils of the three-phase DC motor, when the magnetic pole position detecting unit determines that said any two detected levels are larger than a reference level,
• wherein through the corresponding two phase coils, a second current flows to rotate the rotor, and
• wherein when the magnetic pole position detecting unit determinates that said any two detected levels are larger than the reference level, the magnetic pole position detecting unit determines the direction of the energization and the corresponding two phase coils by ignoring a detection result of a polarity of the induced voltage of an de-energized phase of the three-phase coils, the de-energized phase whose the induced voltage is smaller than the reference level.

A rotation drive control system of a three-phase DC motor comprising:

• a three-phase DC motor including three-phase coils;
• a current detection unit which executes a current detection of a current which flows through the three-phase coils so as to generate a first indicative voltage corresponding to a first phase of the three-phase coils, a second indicative voltage corresponding to a second phase of the three-phase coils, and a third indicative voltage corresponding to a third phase of the three-phase coils;
• and
• a PWM signal generator which generates a first PWM signal by comparing a negative phase triangular wave with the first indicative voltage and a second PWM signal by comparing a positive phase triangular wave with the second indicative voltage, when the first indicative voltage is between the second indicative voltage and the third indicative voltage, said PWM signal generator generating the second PWM signal by comparing a negative phase triangular wave with the second indicative voltage and the first PWM signal by comparing a positive phase triangular wave with the first indicative voltage, when the second indicative voltage is between the first indicative voltage and the third indicative voltage.

A method of starting up a three-phase DC motor including three-phase coils and a rotor comprising:

• generating a first current to flow through each of any two phases of the three-phase coils to detect a polarity of an induced voltage induced in a de-energized phase of the three-phase coils by a drive control unit driving and controlling the three-phase DC motor, thereby determining a direction of energization and corresponding two phase coils through which a second current flows to rotate the rotor;
• based upon determining that any two detected levels of the induced voltages are larger than a predetermined level, determining the direction of energization and the corresponding two phase coils by using two detected polarities of the induced voltages in connection with said any two detected levels thereby rotating the rotor based upon the direction of energization and the corresponding two phase coils thereof are determined;
• and
• driving the three-phase DC motor based upon a first determination in connection with the direction of the energization and the corresponding two phase coils,
• wherein the rotor does not response by the first current, and
• wherein a step of the determining includes:
• based upon determining that said any two detected levels of the induced voltages are larger than the predetermined level, determining the direction of the energization and the corresponding two phase coils by inverting a detection result of a polarity of an induced voltage of the de-energized phase of the three-phase coils, the de-energized phase whose induced voltage is smaller than the predetermined level.