Abstract: To providing a blower that can efficiently cool a plurality of motor coils, which is a large heating source of a blushless motor, by directly blowing and circulating a part of blown air generated by the rotation of an impeller to the motor coils through an air blowing channel. When a motor is started, brown air is obtained from an air blowing port provided in a part of a flange portion so as to be opened to a blower case, directly blown to the motor coils formed around pole teeth of a stator core via an air blowing channel communicating with the air blowing port to cool the motor coils, and circulated to an impeller to perform radiation.

Abstract: To providing a blower that can efficiently cool a plurality of motor coils, which is a large heating source of a blushless motor, by directly blowing and circulating a part of blown air generated by the rotation of an impeller to the motor coils through an air blowing channel. When a motor is started, brown air is obtained from an air blowing port provided in a part of a flange portion so as to be opened to a blower case, directly blown to the motor coils formed around pole teeth of a stator core via an air blowing channel communicating with the air blowing port to cool the motor coils, and circulated to an impeller to perform radiation.

Abstract: In order to provide a battery charging state arithmetic operation device which can judge a charging state of a battery currently being used easily and in a short time, there are provided battery voltage calculation means 6 with specified load for calculating a first and a second battery voltages when a battery current is at a specified load current value from a first I-V characteristic of the battery which is in a first state as a currently used state and is stored in first I-V characteristic storage means 3 and a second I-V characteristic which is in a second state where the amount of remaining energy is small and is stored in second I-V characteristic storage means 4, and SOC arithmetic operation means 7 for calculating an SOC (charging state) of the battery in the first state by using the first and the second battery voltages calculated.

Abstract: In order to provide a battery charging state arithmetic operation device which can judge a charging state of a battery currently being used easily and in a short time, there are provided battery voltage calculation means 6 with specified load for calculating a first and a second battery voltages when a battery current is at a specified load current value from a first I-V characteristic of the battery which is in a first state as a currently used state and is stored in first I-V characteristic storage means 3 and a second I-V characteristic which is in a second state where the amount of remaining energy is small and is stored in second I-V characteristic storage means 4, and SOC arithmetic operation means 7 for calculating an SOC (charging state) of the battery in the first state by using the first and the second battery voltages calculated.