# US 10,873,272 B2 · Pulse width modulation method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,272 B2 - Document ID: US10873272B2 - Status: Granted - Kind: B2 - Application number: 16/486,246 - Filed: 2018-03-28 - Published: 2020-07-30 - Granted: 2020-12-22 - Earliest claimed: 2017-03-28 - Assignees: Daikin Industries, Ltd. - Applicants: Daikin Industries, Ltd. - Inventors: Minoru Kitou; Naoto Kobayashi - Web page: https://patentgrep.com/patent/US10873272B2 ## CPC - H02M 7/527: by pulse width modulation - H02P 29/62: for raising the temperature of the motor - H02M 7/48: using discharge tubes with control electrode or semiconductor devices with control electrode - H02M 7/539: with automatic control of output wave form or frequency (H02M7/5375 - H02M7/5387 take precedence) - H02P 21/22: Current control, e.g. using a current control loop - H02P 27/08: with pulse width modulation - F25B 49/025: {Motor control arrangements} - F25B 2400/01: Heaters - F25B 2500/26: characterised by the startup of the refrigeration cycle - H02M 1/36: Means for starting or stopping converters - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS ## Abstract A locus of integrals, in terms of time, of unit voltage vectors forms a loop within a period shorter than a reciprocal of a maximum value of an operating frequency, in terms of electrical angle, of a compressor motor, the unit voltage vectors being voltage vectors that are units composing an instantaneous space vector indicating voltage which an inverter for driving the compressor motor outputs except in a dead time period. ## Claims ### Claim 1 A pulse width modulation method in which a locus of integrals, in terms of time, of unit voltage vectors forms a loop within a period shorter than a reciprocal of a maximum value of an operating frequency, in terms of electrical angle, of a compressor motor, said unit voltage vectors being voltage vectors that are units composing an instantaneous space vector indicating voltage which an inverter for driving said compressor motor outputs except in a dead time period. ### Claim 2 (depends on 1) The pulse width modulation method according to claim 1, wherein said loop is formed by the locus of integrals, in terms of time, of at least three types of non-zero voltage vectors that are said voltage vectors having non-zero magnitudes. ### Claim 3 (depends on 1) The pulse width modulation method according to claim 1, wherein said period is a control cycle for said inverter. ### Claim 4 (depends on 2) The pulse width modulation method according to claim 2, wherein said period is a control cycle for said inverter. ### Claim 5 (depends on 1) The pulse width modulation method according to claim 1, wherein an increase in a magnitude of said loop or an increase in a frequency of occurrence of said loop increases a heating value of said compressor motor. ### Claim 6 (depends on 2) The pulse width modulation method according to claim 2, wherein an increase in a magnitude of said loop or an increase in a frequency of occurrence of said loop increases a heating value of said compressor motor. ### Claim 7 (depends on 3) The pulse width modulation method according to claim 3, wherein an increase in a magnitude of said loop or an increase in a frequency of occurrence of said loop increases a heating value of said compressor motor. ### Claim 8 (depends on 4) The pulse width modulation method according to claim 4, wherein an increase in a magnitude of said loop or an increase in a frequency of occurrence of said loop increases a heating value of said compressor motor. ### Claim 9 (depends on 1) The pulse width modulation method according to claim 1, wherein said loop is formed in a state where said compressor motor remains stopped. ### Claim 10 (depends on 1) The pulse width modulation method according to claim 1, wherein said loop is formed in a state where said compressor motor is rotating. ### Claim 11 (depends on 1) The pulse width modulation method according to claim 1, wherein a lower limit of vector widths is equal to a second value larger than a first value that is set in a usual operation of said compressor motor, said vector widths corresponding to lengths of times for which at least a pair of non-zero voltage vectors that are said unit voltage vectors having non-zero magnitudes are continuously maintained respectively. ### Claim 12 (depends on 11) The pulse width modulation method according to claim 11, wherein in a period during which said lower limit is set to said first value, in a period during which said unit voltage vectors are maintained, current that is input into said inverter is measurable as DC current. ### Claim 13 (depends on 11) The pulse width modulation method according to claim 11, wherein prior to a period during which said lower limit is set to said second value, said lower limit is set to a third value smaller than said second value, and said inverter is controlled to start said compressor motor. ### Claim 14 (depends on 12) The pulse width modulation method according to claim 12, wherein prior to a period during which said lower limit is set to said second value, said lower limit is set to a third value smaller than said second value, and said inverter is controlled to start said compressor motor.