# US 12,009,705 B2 · Electric blower, vacuum cleaner, and hand dryer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,705 B2 - Document ID: US12009705B2 - Status: Granted - Kind: B2 - Application number: 16/971,769 - Filed: 2018-03-23 - Published: 2021-03-25 - Granted: 2024-06-11 - Earliest claimed: 2018-03-23 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Kazunori Hatakeyama; Yuji Takayama; Haruka Matsuo - Web page: https://patentgrep.com/patent/US12009705B2 ## CPC - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - A47K 10/48: Drying by means of hot air - A47L 5/24: Hand-supported suction cleaners - A47L 9/22: Mountings for motor fan assemblies - A47L 9/28: Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means - A47L 9/2842: {Suction motors or blowers} - F04D 17/16: for displacing without appreciable compression - F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence) - F04D 25/082: {the unit having provision for cooling the motor} - F04D 29/5806: {Cooling the drive system} - F04D 29/5813: {Cooling the control unit} - H02K 3/522: {for generally annular cores with salient poles} - H02K 5/207: {with openings in the casing specially adapted for ambient air} - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - H02K 9/06: with fans or impellers driven by the machine shaft - H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements - H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20) - H02K 1/148: {Sectional cores (H02K1/141 takes precedence)} - H02K 1/2753: the rotor consisting of magnets or groups of magnets arranged with alternating polarity - H02K 3/325: {for windings on salient poles, such as claw-shaped poles} - H02K 5/1675: {radially supporting the rotary shaft at only one end of the rotor (H02K5/1677 takes precedence)} - H02K 7/085: {radially supporting the rotary shaft at only one end of the rotor (H02K7/086, H02K7/09 take precedence)} - H02K 2211/03: Machines characterised by circuit boards, e.g. pcb - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - A47K: SANITARY EQUIPMENT; ACCESSORIES THEREFOR, e.g. TOILET ACCESSORIES - A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract An electric blower includes a fan, a motor to drive the fan, a first board including at least one switching element, and a second board including a microcomputer. The motor, first board, and second board are arranged in this order in a blowing direction of the fan. ## Claims ### Claim 1 An electric blower comprising: a fan; a motor to drive the fan; a first board including at least one switching element; and a second board including a microcomputer, wherein the motor, the first board, and the second board are arranged in this order in a blowing direction of the fan, wherein the first board is disposed of so that the first board is directly exposed to airflow blown from the fan, wherein the first board has a portion that allows the airflow to pass therethrough toward the second board, whereby the airflow blown from the fan reaches the first board and the second board, wherein the first board includes, on a surface on a side opposite the motor, an electrolytic capacitor, wherein the first board and the second board are arranged in an axial direction of the fan such that the airflow blown from the fan moves in the axial direction of the fan from an air inlet to the first board, after which the airflow passes through the portion of the first board that allows airflow to pass, and reaches the second board, wherein: the motor includes a frame, the electric blower includes a first airflow path outside the frame and a second airflow path inside the frame, and the first board faces the first airflow path and the second airflow path, and wherein: the motor further includes: a rotor; and a stator that is disposed to surround the rotor, including a plurality of slots in a circumferential direction of the rotor, and is fitted to an inner side of the frame, and the second airflow path includes an air gap between the rotor and the stator, the plurality of slots, and a gap between the stator and the frame. ### Claim 2 (depends on 1) The electric blower of claim 1, wherein the first board further includes a shunt resistor. ### Claim 3 (depends on 2) The electric blower of claim 2, comprising a first connecting terminal and a second connecting terminal that electrically connect the first board and the motor, wherein: the at least one switching element includes a first switching element connected to the first connecting terminal and the shunt resistor, and a second switching element connected to the second connecting terminal and the shunt resistor, a wiring length from the first connecting terminal to the first switching element is equal to a wiring length from the second connecting terminal to the second switching element, and a wiring length from the first connecting terminal to the shunt resistor is equal to a wiring length from the second connecting terminal to the shunt resistor. ### Claim 4 (depends on 2) The electric blower of claim 2, comprising a first connecting terminal and a second connecting terminal that electrically connect the first board and the motor, wherein: the at least one switching element includes a first switching element connected to the first connecting terminal and the shunt resistor, and a second switching element connected to the second connecting terminal and the shunt resistor, and a wiring impedance when current flows through the motor and the shunt resistor via the first switching element is equal to a wiring impedance when current flows through the motor and the shunt resistor via the second switching element. ### Claim 5 (depends on 1) The electric blower of claim 1, further comprising: a plurality of connecting terminals that connect the first board and the motor; and a magnetic pole position sensor to detect a position of a magnetic pole of the motor, wherein the magnetic pole position sensor is equidistant from adjacent two of the plurality of connecting terminals. ### Claim 6 (depends on 1) The electric blower of claim 1, wherein the microcomputer is provided on a surface of the second board on a side opposite the motor. ### Claim 7 (depends on 1) The electric blower of claim 1, wherein a coating of moisture proof material is formed at least on a surface of the first board facing the motor. ### Claim 8 (depends on 1) The electric blower of claim 1, further comprising a connector that electrically connects the first board and the second board. ### Claim 9 (depends on 1) The electric blower of claim 1, further comprising an air guide to guide airflow generated by the fan to the second airflow path. ### Claim 10 (depends on 1) The electric blower of claim 1, wherein: the motor includes a rotating shaft, the fan is attached to the rotating shaft, and the blowing direction of the fan is in an axial direction of the rotating shaft. ### Claim 11 (depends on 1) The electric blower of claim 1, further comprising a housing that houses the fan, the motor, the first board, and the second board, wherein the first board and the second board are fixed to the housing. ### Claim 12 (depends on 1) A vacuum cleaner comprising: a suction portion including a suction port; a dust collection container to store dust; and the electric blower of claim 1, the electric blower sucking air containing dust through the suction portion into the dust collection container. ### Claim 13 (depends on 1) A hand dryer comprising: a housing including an air inlet and an air outlet; and the electric blower of claim 1, the electric blower being disposed in the housing, and sucking air through the air inlet and blowing air through the air outlet. ### Claim 14 (depends on 1) The electric blower of claim 1, wherein the electrolytic capacitor, disposed on the surface of the first board opposite to the motor, is also opposite to the blowing direction of the fan, which is an axial direction of the fan toward the first board.