# US 12,191,789 B2 · Drive system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,789 B2 - Document ID: US12191789B2 - Status: Granted - Kind: B2 - Application number: 18/025,492 - Filed: 2022-02-18 - Published: 2023-11-16 - Granted: 2025-01-07 - Earliest claimed: 2021-03-29 - Assignees: Hitachi Construction Machinery Co., Ltd. - Applicants: Hitachi Construction Machinery Co., Ltd. - Inventors: Kazuo Nishihama; Masatoshi Yoshimura; Kosuke Matsuo; Satoru Kaneko; Tokuma Ikegami; Seiji Ishida; Toshihiko Watanabe - Web page: https://patentgrep.com/patent/US12191789B2 ## CPC - H02P 3/22: by short-circuit or resistive braking - H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence) - B60L 1/00: Supplying electric power to auxiliary equipment of vehicles (circuit arrangements for charging batteries H02J7/00) - B60L 7/14: for vehicles propelled by AC motors - B60L 15/007: {Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles} - B60L 50/51: characterised by AC-motors - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H02M 7/48: using discharge tubes with control electrode or semiconductor devices with control electrode - H02P 9/00: Arrangements for controlling electric generators for the purpose of obtaining a desired output - B60L 2220/12: Induction machines - B60L 2220/42: with use of more than one motor - B60L 2220/54: Windings for different functions - B60L 2240/421: Speed - B60L 2240/527: Voltage - B60L 2260/26: Transition between different drive modes - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - 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 - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - 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) ## Abstract It is an object of the present invention to provide a drive system including an induction generator comprising some primary windings that has a main winding and an auxiliary winding, the drive system being capable of supplying electric power required by an auxiliary inverter, even in a regenerative mode of operation in which only the auxiliary winding is energized. The maximum current value of a converter for power generating is set on the basis of the maximum output power of the auxiliary winding of the induction generator and the minimum voltage applied to the auxiliary winding unless a traction inverter is in a regenerative mode of operation, and the non-load current value of the induction generator is set such that the maximum current in the auxiliary winding under the situation of the traction inverter being in the regenerative mode of operation does not exceed the maximum current in the converter for power generating. ## Claims ### Claim 1 A drive system comprising: an induction generator having some primary windings that has a main winding and an auxiliary winding; a traction inverter for supplying electric power to a traction motor; an auxiliary inverter for supplying electric power to an auxiliary motor; a rectifier having a terminal for alternating current connected to the main winding and a terminal for direct current connected to the traction inverter; and a converter for power generating having a terminal for alternating current connected to the auxiliary winding and a terminal for direct current connected to the auxiliary inverter, wherein a maximum current value of the converter for power generating is set on a basis of a maximum output power of the auxiliary winding and a minimum voltage applied to the auxiliary winding unless the traction inverter is in a regenerative mode of operation, and a non-load current value of the induction generator is set such that a maximum current in the auxiliary winding under the condition of the traction inverter being in the regenerative mode of operation does not exceed a maximum current in the converter for power generating. ### Claim 2 (depends on 1) The drive system according to claim 1, wherein an excitation current with respect to a rated current in the main winding is equal to or less than [ Formula ⁢ 1 ] 0.5 K s ⁢ P AuxMax S Main ⁢ f Min f Max ⁢ ( V MainMax V MainMax ) 2 where a maximum voltage applied to the main winding is indicated by VMainMax, a minimum voltage applied to the main winding is indicated by VMainMin, a maximum frequency of the induction generator under the situation of the traction inverter being in the regenerative mode of operation is indicated by fMax, a minimum frequency of the induction generator under the situation of the traction inverter being in the regenerative mode of operation is indicated by fMin, a power generating capacity of the main winding is indicated by SMain, the maximum output power of the auxiliary winding is indicated by PAuxMax, and a saturation coefficient as a ratio of a self-inductance value of the main winding under the condition of a minimum value of a current in the auxiliary winding becoming maximum under the condition of the traction inverter being in the regenerative mode of operation with respect to the self-inductance value of the main winding under the condition of the generated power frequency of the induction generator being equal to fMax and a voltage applied to the main winding being equal to VMainMax is indicated by Ks. ### Claim 3 (depends on 2) The drive system according to claim 2, wherein the self-inductance value of the main winding is smaller than [ Formula ⁢ 2 ] V MainMin 2 π ⁢ f Min ⁢ P AuxMax and larger than [ Formula ⁢ 3 ] V MainMin 2 π ⁢ K s ⁢ f Min ⁢ P AuxMax where the generated power frequency of the induction generator is equal to fMax and the voltage applied to the main winding thereof is equal to VMainMax. ### Claim 4 (depends on 2) The drive system according to claim 2, wherein the saturation coefficient is set on a basis of a relation between voltages and currents obtained by a non-load test on the induction generator. ### Claim 5 (depends on 1) An electrically driven dump truck comprising: the drive system according to claim 1. ### Claim 6 (depends on 1) An electrically driven vehicle comprising: the drive system according to claim 1. ### Claim 7 (depends on 6) The electrically driven vehicle according to claim 6, comprising: a starter battery connected at all times to the terminal for direct current of the converter for power generating and a terminal for direct current of the auxiliary inverter, wherein the starter battery has a same voltage as a voltage at the terminal for direct current of the auxiliary inverter.