Abstract: An impeller includes Z blades, where Z is an integer equal to 5 or more, arranged in a circumferential direction of the impeller and extending radially, and pitch angles between adjacent blades are all different. In terms of an arbitrary pitch angle ?, when a pitch angle ?1 adjacent to the pitch angle ?, and a pitch angle ?2 adjacent to the pitch angle ?, different from the pitch angle ?1, satisfy a relation, ?1<?2, a pitch angle ?1 different from the pitch angle ? adjacent to the pitch angle ?1 and a pitch angle ?2 adjacent to the pitch angle ?2, different from the pitch angle ?, satisfy a relation, ?2<?1.

Abstract: An impeller includes Z blades, where Z is an integer equal to 5 or more, arranged in a circumferential direction of the impeller and extending radially, and pitch angles between adjacent blades are all different. In terms of an arbitrary pitch angle ?, when a pitch angle ?1 adjacent to the pitch angle ?, and a pitch angle ?2 adjacent to the pitch angle ?, different from the pitch angle ?1, satisfy a relation, ?1<?2, a pitch angle ?1 different from the pitch angle ? adjacent to the pitch angle ?1 and a pitch angle ?2 adjacent to the pitch angle ?2, different from the pitch angle ?, satisfy a relation, ?2<?1.

Abstract: An identification method includes supplying a motor power supply voltage from an identification device to a brushless DC motor via a power line, receiving the supply of the power supply voltage to rotate the brushless DC motor in accordance with a Pulse Width Modulation (PWM) signal output from a drive circuit of the brushless DC motor, superimposing an identification signal with a same frequency as that of the PWM signal on a power supply current flowing through the power line upon rotation of the brushless DC motor, acquiring the power supply current flowing through the power line, detecting the frequency of the identification signal superimposed on the power supply current, and identifying information about the brushless DC motor based on the detected frequency of the identification signal.

Abstract: The identification method according to an embodiment is used for an identification device for identifying the type of a brushless DC motor. A brushless DC motor includes an output terminal for outputting a signal. The output terminal is able to output a signal obtained by superimposing signal types. The signal resulting from the superimposition is different depending on the types of brushless DC motors. In the identification method, power is supplied to a brushless DC motor, and the signal resulting from the superimposition that is output from the output terminal of the brushless DC motor is input to an identification device. The signal resulting from the superimposition is separated into signal types, and the separated signals are used to identify the type of the brushless DC motor.

Abstract: An impeller includes Z blades, where Z is an integer equal to 5 or more, arranged in a circumferential direction of the impeller and extending radially, pitch angles between adjacent blades being all different. In terms of an arbitrary pitch angle ?, when a pitch angle ?1 adjacent to the pitch angle ?, and a pitch angle ?2 adjacent to the pitch angle ?, different from the pitch angle ?1, satisfy a relation, ?1<?2, a pitch angle ?1 different from the pitch angle ? adjacent to the pitch angle ?1 and a pitch angle ?2 adjacent to the pitch angle ?2, different from the pitch angle ?, satisfy a relation, ?2<?1.

Abstract: A brushless DC motor identification method capable of identifying information on a brushless DC motor, particularly without performing any handshaking, includes supplying an input voltage from an identifier to a brushless DC motor including at least one resistor connected between a power supply line and a GND line, reading a resistance value of at least one resistor in a state where the inverter of the brushless DC motor is off, and identifying information on the brushless DC motor based on the read resistance value.

Abstract: A signal processing apparatus includes a processor, a memory storing a program, and an integration circuit that performs filter processing on an input signal to output a processed signal. The processor samples an output signal output from the integration circuit in a sampling period Ts and stores a sampled value of the output signal in accordance with the program, and detects a duty of the input signal based on a difference between a value of the output signal at a time t0 representing a present time point and a sampled value of the output signal obtained at a time t0?n representing an earlier time than the time t0 by an n sampling period when n is a positive integer, the value of the output signal, a value of the integer n, the sampling period Ts, and a time constant of a filter of the integration circuit.

Abstract: An impeller includes Z blades, where Z is an integer equal to 5 or more, arranged in a circumferential direction of the impeller and extending radially, pitch angles between adjacent blades being all different. In terms of an arbitrary pitch angle ?, when a pitch angle ?1 adjacent to the pitch angle ?, and a pitch angle ?2 adjacent to the pitch angle ?, different from the pitch angle ?1, satisfy a relation, ?1<?2, a pitch angle ?1 different from the pitch angle ? adjacent to the pitch angle ?1 and a pitch angle ?2 adjacent to the pitch angle ?2, different from the pitch angle ?, satisfy a relation, ?2<?1.

Abstract: An identification method used for an identification device that identifies information on a brushless DC motor output from the brushless DC motor, the identification method including supplying a power supply voltage from the identification device to the brushless DC motor via a power line, rotating the brushless DC motor in accordance with a Pulse Width Modulation signal output from a drive circuit of the brushless DC motor upon reception of supply of the power supply voltage, measuring a reaching time until a driving current flowing through the power line along with rotation of the brushless DC motor reaches a threshold value, and identifying information on the brushless DC motor based on the reaching time.

Abstract: An identification method includes supplying a motor power supply voltage from an identification device to a brushless DC motor via a power line, receiving the supply of the power supply voltage to rotate the brushless DC motor in accordance with a Pulse Width Modulation (PWM) signal output from a drive circuit of the brushless DC motor, superimposing an identification signal with a same frequency as that of the PWM signal on a power supply current flowing through the power line upon rotation of the brushless DC motor, acquiring the power supply current flowing through the power line, detecting the frequency of the identification signal superimposed on the power supply current, and identifying information about the brushless DC motor based on the detected frequency of the identification signal.

Abstract: A brushless DC motor identification method includes supplying an input voltage from the identification device to a brushless DC motor via a power supply line, the brushless DC motor including at least one resistor connected between the power supply line and a GND line, an inverter that drives a motor, and a switching circuit that switches connection and disconnection between the power supply line and the inverter, disconnecting the inverter from the power supply line via the switching circuit, reading a resistance value of the at least one resistor in a state where driving of the inverter is stopped, and identifying information on the brushless DC motor based on the read resistance value of the at least one resistor.

Abstract: A brushless DC motor identification method capable of identifying information on a brushless DC motor, particularly without performing any handshaking, includes supplying an input voltage from an identifier to a brushless DC motor including at least one resistor connected between a power supply line and a GND line, reading a resistance value of at least one resistor in a state where the inverter of the brushless DC motor is off, and identifying information on the brushless DC motor based on the read resistance value.

Abstract: A motor of an outer rotor type provided in an air blower includes a rotor rotatable about a central axis extending in a vertical direction, and a stator to drive the rotor. The rotor includes a magnet on which magnetized regions including magnetic poles different from each other are alternately arranged in a circumferential direction, and a rotor yoke which is provided on a radial-directional outer surface of the magnet using a magnetic material, and includes a yoke cylinder extending in an axial direction. A cross-sectional area of the yoke cylinder viewed in the circumferential direction at a circumferential-directional position that overlaps a space between the adjacent magnetized regions in the radial direction is larger than a cross-sectional area of the yoke cylinder viewed in the circumferential direction at a circumferential-directional position that overlaps an inner portion of each magnetized region in the radial direction.

Abstract: The identification method according to an embodiment is used for an identification device for identifying the type of a brushless DC motor. A brushless DC motor includes an output terminal for outputting a signal. The output terminal is able to output a signal obtained by superimposing signal types. The signal resulting from the superimposition is different depending on the types of brushless DC motors. In the identification method, power is supplied to a brushless DC motor, and the signal resulting from the superimposition that is output from the output terminal of the brushless DC motor is input to an identification device. The signal resulting from the superimposition is separated into signal types, and the separated signals are used to identify the type of the brushless DC motor.

Abstract: A signal processing apparatus includes a processor, a memory storing a program, and an integration circuit that performs filter processing on an input signal to output a processed signal. The processor samples an output signal output from the integration circuit in a sampling period Ts and stores a sampled value of the output signal in accordance with the program, and detects a duty of the input signal based on a difference between a value of the output signal at a time t0 representing a present time point and a sampled value of the output signal obtained at a time t0?n representing an earlier time than the time t0 by an n sampling period when n is a positive integer, the value of the output signal, a value of the integer n, the sampling period Ts, and a time constant of a filter of the integration circuit.

Abstract: An identification method is an identification method for use in an identification apparatus that identifies types of brushless DC motors each including a circuit board on which a terminal for tachometer is mounted. The duty ratios of pulses outputted from the terminals for tachometer vary among multiple types of brushless DC motors. The identification method includes: supplying a power supply voltage from the identification apparatus to a brushless DC motor; inputting pulses outputted from the terminal for tachometer of the circuit board to the identification apparatus; obtaining the duty ratio of the pulses as a unique information piece of the brushless DC motor; and identifying the type of the brushless DC motor based on the unique information piece of the brushless DC motor.

Abstract: An identification method is an identification method for use in an identification apparatus that identifies types of brushless DC motors each including a circuit board on which a terminal for tachometer is mounted. The numbers of pulses per rotation or unit time outputted from the terminals for tachometer vary among multiple types of brushless DC motors. The identification method includes: supplying a power supply voltage from the identification apparatus to a brushless DC motor; inputting a pulse signal outputted from the terminal for tachometer of the circuit board to the identification apparatus; counting the number of pulses in the pulse signal; obtaining a unique information piece of the brushless DC motor based on the counted number of pulses; and identifying a type of the brushless DC motor based on the unique information piece of the brushless DC motor.

Abstract: Provided is an identification method for use in an identification apparatus that identifies types of brushless DC motors. Each brushless DC motor includes a circuit board on which at least one terminal with a pull-up resistance incorporated therein is mounted. The pull-up resistances vary among multiple types of brushless DC motors. A power supply voltage is supplied from the identification apparatus to a brushless DC motor, a pull-up voltage value set by the pull-up resistance and outputted from the at least one terminal of the brushless DC motor is inputted to the identification apparatus, and the identification apparatus identifies the type of the brushless DC motor based on the pull-up voltage value.

Abstract: A brushless DC motor includes a circuit board on which a terminal with an open-collector or open-drain output function is mounted. The terminal includes at least one of a first specific resistance connected in series to a switching element and a second specific resistance connected in parallel to the switching element. The first and second specific resistances vary among multiple types of brushless DC motors. A motor identification method includes: supplying a power supply voltage from an identification apparatus to the brushless DC motor; supplying a voltage to a signal line of the terminal via a pull-up resistance in the identification apparatus; inputting to the identification apparatus an identification voltage value set by the least one specific resistance and outputted from the terminal; and identifying a type of the brushless DC motor based on the identification voltage value.

Abstract: Provided is an identification method for use in an identification apparatus that identifies types of brushless DC motors. Each brushless DC motor includes a circuit board on which at least one terminal with a pull-up resistance incorporated therein is mounted. The pull-up resistances vary among multiple types of brushless DC motors. A power supply voltage is supplied from the identification apparatus to a brushless DC motor, a pull-up voltage value set by the pull-up resistance and outputted from the at least one terminal of the brushless DC motor is inputted to the identification apparatus, and the identification apparatus identifies the type of the brushless DC motor based on the pull-up voltage value.