# US 2022/0045643 A1 · Rotating electric machine drive device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0045643 A1 - Document ID: US20220045643A1 - Status: Published application - Kind: A1 - Application number: 17/296,319 - Filed: 2018-11-29 - Published: 2022-02-10 - Earliest claimed: 2018-11-29 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Hideaki KAWAMOTO; Tomoya TACHIBANA; Matahiko IKEDA; Yoshihiko KIMPARA - Web page: https://patentgrep.com/patent/US20220045643A1 ## CPC - B60L 58/25: by controlling the electric load - H02P 29/68: based on the temperature of a drive component or a semiconductor component - B60L 15/02: characterised by the form of the current used in the control circuit - H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence) - B60L 2210/14: Boost converters - B60L 2240/545: Temperature - H02P 2201/09: Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 90/14: Plug-in electric vehicles - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Provided is a drive device for a rotating electric machine, including: a power conversion unit configured to convert DC power supplied from a storage battery into AC power, and to supply the AC power to a rotating electric machine; and a control unit output a switching signal to the power conversion unit. The control unit is configured to set, when the storage battery is to be charged, in a case in which a temperature of the storage battery input from an outside is lower than a set temperature suitable for charging, the switching signal for the power conversion unit so as to be different from the switching signal in a normal drive state of the rotating electric machine. ## Claims ### Claim 1 A drive device for a rotating electric machine, comprising: a power conversion unit configured to convert DC power supplied from a storage battery into AC power, and to supply the AC power to a rotating electric machine; and a control unit configured to output a switching signal to the power conversion unit, and to set, when the storage battery is to be charged, in a case in which a temperature of the storage battery input from an outside is lower than a set temperature suitable for charging, the switching signal for the power conversion unit so as to be different from the switching signal in a normal drive state of the rotating electric machine. ### Claim 2 (depends on 1) The drive device for a rotating electric machine according to claim 1, wherein the control unit is configured to set a frequency of the switching signal for the power conversion unit so as to be different from a frequency of the switching signal in the normal drive state of the rotating electric machine. ### Claim 3 (depends on 2) The drive device for a rotating electric machine according to claim 2, wherein the control unit is configured to set the frequency of the switching signal for the power conversion unit to a predetermined maximum frequency. ### Claim 4 (depends on 1) The drive device for a rotating electric machine according to claim 1, wherein the power conversion unit includes a DC/DC converter circuit, and wherein the control unit is configured to set a duty ratio of a switching signal for the DC/DC converter circuit so that a boost voltage of the DC/DC converter circuit becomes a boost voltage at which a sum of power losses of the rotating electric machine and the power conversion unit is maximum. ### Claim 5 (depends on 1) The drive device for a rotating electric machine according to claim 1, wherein the power conversion unit includes a DC/AC inverter circuit, and wherein the control unit is configured to set a switching signal for the DC/AC inverter circuit so that an electrical angle of the rotating electric machine input from an outside is matched with a phase at which a difference between a maximum value and a minimum value of a current amount of each phase of the rotating electric machine is minimum. ### Claim 6 (depends on 5) The drive device for a rotating electric machine according to claim 5, wherein the control unit is configured to prevent three-phase AC power from being supplied to the rotating electric machine when a temperature of a phase corresponding to a target phase of the electrical angle in the rotating electric machine input from the outside becomes higher than a predetermined set temperature. ### Claim 7 (depends on 1) The drive device for a rotating electric machine according to claim 1, wherein the power conversion unit includes a DC/AC inverter circuit, and wherein the control unit is configured to select one set angle from one or a plurality of predetermined set angles based on an electrical angle of the rotating electric machine input from an outside, and to set a switching signal for the DC/AC inverter circuit based on the selected one set angle.