초록 ▼

A motor-generator system of a hybrid drive with an internal combustion engine (ICE) and an electric machine (EM) connected to an energy storage device (BA) via a converter device (CD). The motor-generator system can be used in addition to supply external power consumers (PC) in isolated operation, w

A motor-generator system of a hybrid drive with an internal combustion engine (ICE) and an electric machine (EM) connected to an energy storage device (BA) via a converter device (CD). The motor-generator system can be used in addition to supply external power consumers (PC) in isolated operation, with little incremental complexity. For this purpose, the electric machine (EM) includes, in addition to a first stator winding (W1) for traction operation, a second stator winding (W2) for isolated generator operation. The second stator winding (W2) is advantageously coupled in transformer-fashion to the first stator winding (W1) and can thus be supplied with magnetizing current from the energy storage device (BA) via the converter device (CD).

대표청구항 ▼

A motor-generator system of a hybrid drive with an internal combustion engine (ICE) and an electric machine (EM) connected to an energy storage device (BA) via a converter device (CD). The motor-generator system can be used in addition to supply external power consumers (PC) in isolated operation, w

A motor-generator system of a hybrid drive with an internal combustion engine (ICE) and an electric machine (EM) connected to an energy storage device (BA) via a converter device (CD). The motor-generator system can be used in addition to supply external power consumers (PC) in isolated operation, with little incremental complexity. For this purpose, the electric machine (EM) includes, in addition to a first stator winding (W1) for traction operation, a second stator winding (W2) for isolated generator operation. The second stator winding (W2) is advantageously coupled in transformer-fashion to the first stator winding (W1) and can thus be supplied with magnetizing current from the energy storage device (BA) via the converter device (CD). e and supplying electric power to said armature winding, a field current supply circuit for performing switching control of a field current which flows in said field winding, and a control circuit for controlling said AC-to-DC and DC-to-AC power converter and said field current supply circuit; wherein designating a maximum allowable temperature for said rotor as Tmax, a maximum temperature that will be attained by the rotor during electric power generation operation as Tgmax, and a thermal capacity of the rotor as Q, a time interval for which current is passed through said field current during an engine starting operation as T, the resistance of said field winding as r, and the field current that is supplied generation of electric power as i, said control circuit is configured to limit said field current during generation of electric power by said synchronous machine to a value such that (Tgmax+(i2·r·t)/Q) is lower than the temperature value Tmax. 6. The vehicle motor-generator apparatus as claimed in claim 5, wherein designating a maximum value of said field current that is supplied during an engine starting operation as imax, said control circuit is configured to limit said field current during generation of electric power by said synchronous machine to a value such that (Tgmax+(imax2·r·t)/Q) is lower than said temperature value Tmax by an amount which is within the range 10° Centigrade to 40° Centigrade. 7. The vehicle motor-generator apparatus as claimed in claim 5, wherein said control circuit is configured to derive an electrical quantity relating to an average value of said field current and an average value of said armature current during a predetermined time interval which extends up to the commencement of an engine starting operation effected by said motor-generator apparatus, and to limit at least one of said field current and said armature current to a value that is determined based upon said electrical quantity, during an electric power generation operation performed by said motor-generator apparatus. 8. The vehicle motor-generator apparatus as claimed in claim 5, wherein said control circuit is configured to derive an electrical quantity relating to ambient temperature, and to control said field current during an electric power generation operation or during an engine starting operation, to a value which is based upon said electrical quantity. 9. A motor-generator apparatus for a vehicle, controlled for selectively operating in an electric motor mode for performing starting of an engine of said vehicle and in an electric generator mode for generating electric power while said vehicle is running, comprising: a synchronous machine having a rotor with a rotor core thereof having a field winding wound thereon, an AC-to-DC and DC-to-AC power converter for receiving electric power from an armature winding of said synchronous machine and supplying electric power to said armature winding, a field current supply circuit for performing switching control of a field current which flows in said field winding, and a control circuit for controlling said AC-to-DC and DC-to-AC power converter and said field current supply circuit; wherein said control circuit functions during an engine starting operation effected by said motor-generator apparatus to control said field current and said armature current such as to produce a magnetic saturation condition of a magnetic circuit which passes through said rotor core, and to control the value of a field magnetic force Ff to a higher value than an armature magnetic force Fa, where said field magnetic force Ff is determined as the product of said field current by a number of turns of said field winding and said armature magnetic force Fa is determined as the product of said armature current by a number of turns of said armature winding. 10. A motor-generator apparatus for a vehicle, controlled for selectively operating in an electric motor mode for