Drive system, method for operating a drive system, and use
First Claim
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1. A drive system, comprising:
- an electromotor;
an inverter; and
an energy store;
wherein the electromotor is suppliable from the inverter and the inverter is suppliable from the energy store;
wherein the electromotor is arranged as three-phase AC motor in a star connection;
wherein a star point of the electromotor is suppliable with current from a rectifier, which is suppliable from a secondary winding; and
wherein the secondary winding suppliable from a primary winding, which is inductively coupled to the secondary winding;
wherein if a first critical value of a voltage at the star point is exceeded, a charge current is discharged directly from the rectifier to the energy store with the aid of a diode, the first critical value corresponding to a charging voltage for the energy store;
wherein if the first critical value of the voltage at the star point is undershot, the charge current is routed from the rectifier to the energy store via at least one stator winding and the inverter, the inverter and stator windings being operable as a boost chopper; and
wherein if a second critical value which is greater than the first critical value is exceeded, a switch is closed, via which current is shunted from the star point to a lower potential, to protect the energy store from overcharging.
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Abstract
A drive system and method for operating a drive system, including an electromotor, inverter, energy store,
- the electromotor being able to be supplied from the inverter, which is supplyable from the energy store,
- a current able to be controlled by a switch being supplyable to at least one stator winding of the electromotor, which is supplied from an electrical energy source that differs from the energy store.
10 Citations
12 Claims
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1. A drive system, comprising:
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an electromotor; an inverter; and an energy store; wherein the electromotor is suppliable from the inverter and the inverter is suppliable from the energy store; wherein the electromotor is arranged as three-phase AC motor in a star connection; wherein a star point of the electromotor is suppliable with current from a rectifier, which is suppliable from a secondary winding; and wherein the secondary winding suppliable from a primary winding, which is inductively coupled to the secondary winding; wherein if a first critical value of a voltage at the star point is exceeded, a charge current is discharged directly from the rectifier to the energy store with the aid of a diode, the first critical value corresponding to a charging voltage for the energy store; wherein if the first critical value of the voltage at the star point is undershot, the charge current is routed from the rectifier to the energy store via at least one stator winding and the inverter, the inverter and stator windings being operable as a boost chopper; and wherein if a second critical value which is greater than the first critical value is exceeded, a switch is closed, via which current is shunted from the star point to a lower potential, to protect the energy store from overcharging. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a drive system including an electromotor which is suppliable from an energy store, comprising:
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operating the electromotor in a star connection; supplying current from a secondary winding to a rectifier; supplying current from the rectifier to a star point of the electromotor; supplying current from a primary winding to the secondary winding in contactless manner; and producing a charge current for the energy store by an inverter, via which stator windings of the electromotor are suppliable using a three-phase voltage system, which is produced in motive operation when the inverter is supplied from the energy store, as long as the voltage arising at the star point lies below a first critical value; wherein if a first critical value of a voltage at the star point is exceeded, a charge current is discharged directly from the rectifier to the energy store with the aid of a diode, the first critical value corresponding to a charging voltage for the energy store; wherein if the first critical value of the voltage at the star point is undershot, the charge current is routed from the rectifier to the energy store via at least one stator winding and the inverter, the inverter and stator windings being operable as a boost chopper; and wherein if a second critical value which is greater than the first critical value is exceeded, a switch is closed, via which current is shunted from the star point to a lower potential, to protect the energy store from overcharging. - View Dependent Claims (9, 10, 11)
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12. A system comprising:
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a stator winding of an electromotor arranged as an inductance of at least one of (a) a charging circuit, (b) a Buck converter, and (c) a boost chopper, adapted to charge an energy store; wherein a star point of the electromotor is suppliable with current from a rectifier, which is suppliable from a secondary winding; and wherein the secondary winding suppliable from a primary winding, which is inductively coupled to the secondary winding; wherein if a first critical value of a voltage at a star point is exceeded, a charge current is discharged directly from the rectifier to the energy store with the aid of a diode, the first critical value corresponding to a charging voltage for the energy store; and wherein if the first critical value of the voltage at the star point is undershot, the charge current is routed from the rectifier to the energy store via the stator winding and an inverter, the inverter and stator windings being operable as the boost chopper; and wherein if a second critical value which is greater than the first critical value is exceeded, a switch is closed, via which current is shunted from the star point to a lower potential, to protect the energy store from overcharging.
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Specification