Abstract: An identification method that identifies a type of a fan motor unit in an air blowing system that includes: a fan motor unit including a motor, a fan, and a casing; and a controller that controls the fan motor unit. The fan motor unit blows air to the outside. The identification method includes: a first step of the controller outputting, to the fan motor unit, a first air flow rate instruction that is output at a time of performing control to cause the fan motor unit to operate normally; a second step of the controller acquiring a first speed notification that is output from the fan motor unit in response to the outputting of the first air flow rate instruction; and a third step of the controller identifying, based on the first air flow rate instruction and the first speed notification, a type of the fan motor unit and outputting a type identification signal indicating the identified type.

Abstract: An inrush current suppression device is an inrush current suppression device that suppresses an inrush current flowing from a DC power supply through a mechanical switch, and includes: a first capacitor having one end connected to a positive terminal of the DC power supply through the mechanical switch; a semiconductor switching element connected to the other end of the first capacitor and a negative terminal of DC power supply between the other end of the first capacitor and the negative terminal of the DC power supply; a resistance element connected in parallel to the semiconductor switching element; and a control circuit for controlling the semiconductor switching element. The control circuit has a first output port, and controls ON time and OFF time of the semiconductor switching element by outputting a PWM signal from the first output port to the semiconductor switching element after the mechanical switch is closed.

Abstract: An inrush current suppression device is an inrush current suppression device that suppresses an inrush current flowing from a DC power supply through a mechanical switch, and includes: a first capacitor having one end connected to a positive terminal of the DC power supply through the mechanical switch; a semiconductor switching element connected to the other end of the first capacitor and a negative terminal of DC power supply between the other end of the first capacitor and the negative terminal of the DC power supply; a resistance element connected in parallel to the semiconductor switching element; and a control circuit for controlling the semiconductor switching element. The control circuit has a first output port, and controls ON time and OFF time of the semiconductor switching element by outputting a PWM signal from the first output port to the semiconductor switching element after the mechanical switch is closed.

Abstract: Motor controller of the present invention is used in an automobile including wheel drive motor, wheel drive inverter, and cooling fan being an accessory. Wheel drive inverter drives wheel drive motor by PWM control at a primary carrier frequency. Cooling fan has fan motor being an accessory drive motor. Motor controller includes accessory drive inverter and frequency switch. Accessory drive inverter drives fan motor by PWM control at a secondary carrier frequency. Frequency switch switches a frequency of the secondary carrier frequency based on the primary carrier frequency.

Abstract: A communication apparatus (100) of the present invention includes a first communication circuit (2), a second communication circuit (1), and one signal line (3). The first communication circuit (2) transmits a collector voltage of an open collector circuit as an output signal. A second communication circuit (1) receives the output signal. The one signal line (3) connects the first communication circuit (2) and the second communication circuit (1). Particularly the first communication circuit (2) transmits the output signal as a pulse signal (57) to the second communication circuit (1). The second communication circuit (1) transmits a voltage signal (56) generated in the second communication circuit (1) to the first communication circuit (2). The first communication circuit (2) and the second communication circuit (1) communicate the pulse signal (57) and the voltage signal (56) bidirectionally via the signal line (3).

Abstract: Motor controller of the present invention is used in an automobile including wheel drive motor, wheel drive inverter, and cooling fan being an accessory. Wheel drive inverter drives wheel drive motor by PWM control at a primary carrier frequency. Cooling fan has fan motor being an accessory drive motor. Motor controller includes accessory drive inverter and frequency switch. Accessory drive inverter drives fan motor by PWM control at a secondary carrier frequency. Frequency switch switches a frequency of the secondary carrier frequency based on the primary carrier frequency.

Abstract: A communication apparatus (100) of the present invention includes a first communication circuit (2), a second communication circuit (1), and one signal line (3). The first communication circuit (2) transmits a collector voltage of an open collector circuit as an output signal. A second communication circuit (1) receives the output signal. The one signal line (3) connects the first communication circuit (2) and the second communication circuit (1). Particularly the first communication circuit (2) transmits the output signal as a pulse signal (57) to the second communication circuit (1). The second communication circuit (1) transmits a voltage signal (56) generated in the second communication circuit (1) to the first communication circuit (2). The first communication circuit (2) and the second communication circuit (1) communicate the pulse signal (57) and the voltage signal (56) bidirectionally via the signal line (3).

Abstract: The blower apparatus includes a motor; a fan; a motor drive circuit for electrically driving the coil; a microprocessor for controlling the motor drive circuit; and a motor case integrally incorporating the motor, the motor drive circuit, and the microprocessor. The blower apparatus further includes an internal power line for supplying power supply voltage Vig supplied to power supply input terminal Tv1, to the motor drive circuit and the microprocessor in the motor case; a smoothing capacitor connected to the internal power line; and a cut off control circuit for cutting off supply of the power supply voltage to the internal power line according to a command from the microprocessor.

Abstract: The blower apparatus includes a motor; a fan; a motor drive circuit for electrically driving the coil; a microprocessor for controlling the motor drive circuit; and a motor case integrally incorporating the motor, the motor drive circuit, and the microprocessor. The blower apparatus further includes an internal power line for supplying power supply voltage Vig supplied to power supply input terminal Tv1, to the motor drive circuit and the microprocessor in the motor case; a smoothing capacitor connected to the internal power line; and a cut off control circuit for cutting off supply of the power supply voltage to the internal power line according to a command from the microprocessor.

Abstract: A phase-shift detection circuit detects a phase shift in motor driving, using pulse-shaped position detection signal Rd and measurement signal Ms. The position detection signal is based on sensor signal Hs from a position sensor disposed in a motor. The measurement signal is based on the induced voltage from windings. The phase-shift detection circuit includes a level difference calculator and a phase-shift calculator. The level difference calculator calculates a level difference between the level of measurement signal Ms at a rising timing of position detection signal Rd and the level of measurement signal Ms at a falling timing thereof. The phase-shift calculator calculates the amount of phase shifts based on the level difference.

Abstract: A phase-shift detection circuit detects a phase shift in motor driving, using pulse-shaped position detection signal Rd and measurement signal Ms. The position detection signal is based on sensor signal Hs from a position sensor disposed in a motor. The measurement signal is based on the induced voltage from windings. The phase-shift detection circuit includes a level difference calculator and a phase-shift calculator. The level difference calculator calculates a level difference between the level of measurement signal Ms at a rising timing of position detection signal Rd and the level of measurement signal Ms at a falling timing thereof. The phase-shift calculator calculates the amount of phase shifts based on the level difference.

Abstract: A centrifugal multi-blade impeller (10) that has a plurality of blades (11) around a central axis of rotation (10a) and that radially outwardly blows air taken in along the central axis of rotation is housed in a spiral scroll casing (20). The ratio of H/D of height H of the centrifugal multi-blade impeller in a direction of the central axis of rotation to diameter D of the centrifugal multi-blade impeller is 0.2 or less. The scroll casing has a logarithmic spiral spread angle ? of 2.0 degrees or more. It is thereby possible to provide a small and low profile centrifugal air blower that has high air blowing performance and is low noise.

Abstract: A motor controller comprising drive unit for supplying power to the stator windings of a motor based on a current command, a stator current detection unit for detecting the stator current flowing in the stator windings, a saturation degree production unit for producing the saturation degree data indicating the extent to which the stator current deviates from the current command based on the current command and the stator current, a reference value production unit for producing a reference value of the saturation degree, a gain production unit for producing a gain indicating the rate at which the current command is changed, and a current command production unit for producing the current command data based on the saturation degree, the reference value and the gain, wherein the gain production unit produces the gain data based on at least one of the rotational speed of the motor and the current command.

Abstract: A motor controller comprises a stator current production unit for producing stator current commands that are command values for the stator current flowing through the stator windings, a drive unit for supplying electric power to the stator windings based on the stator current commands, a stator current detection unit ZU, ZV, and ZW, for detecting the stator currents flowing through the stator windings, and a saturation degree production unit for producing a saturation degree indicating by how much the stator current is not following the stator current command. The stator current production unit produces the stator current commands based on the saturation degree. The saturation degree production unit produces the saturation degree based on the current commands, the stator current signals, and the pole-position signals.