Method for detecting a motor phase fault of a motor arrangement and drive circuit for driving an electronically commutated motor
AssigneeDiehl AKO Stiftung & Co. KG
InventorsMARTIN WEINMANN, ANDREAS SCHMID, SEBASTIAN TINIUS
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Abstract
In a method for detecting a motor phase fault of a motor arrangement, the motor phases of which are connected to a drive circuit having a DC voltage intermediate circuit and an inverter. A motor phase voltage at at least one of the motor phases with respect to a reference potential is captured while the inverter is switched off; and a voltage profile of the captured motor phase voltage is used to determine whether there is a motor phase fault on one of the motor phases of the motor arrangement.
Claims14
A method for detecting a motor phase fault of a motor configuration, motor phases of the motor configuration being connected to a drive circuit having a DC voltage intermediate circuit and an inverter, which comprises the steps of:
- capturing a motor phase voltage at at least one of the motor phases with respect to a reference potential while the inverter is switched off;
- and
- using a voltage profile of the motor phase voltage captured to determine whether there is the motor phase fault on one of the motor phases of the motor configuration.
A method for operating a drive circuit having a DC voltage intermediate circuit and an inverter for driving an electronically commutated motor, which further comprises:
- connecting motor phases of a motor configuration containing the electronically commutated motor to the inverter of the drive circuit;
- checking for a presence of a motor phase fault in the motor configuration by:
- capturing a motor phase voltage at at least one of the motor phases with respect to a reference potential while the inverter is switched off;
- and
- using a voltage profile of the motor phase voltage captured to determine whether there is the motor phase fault on one of the motor phases of the motor configuration;
- and
- preventing a switching-on of the inverter and/or of a power factor correction filter of the drive circuit after capturing the motor phase voltage if the motor phase fault has been determined.
A method for operating a drive circuit having a DC voltage intermediate circuit, a power factor correction filter and an inverter for driving an electronically commutated motor, which further comprises:
- connecting the motor phases of a motor configuration containing the electronically commutated motor to the inverter of the drive circuit;
- checking for a presence of a motor phase fault in the motor configuration by:
- capturing a motor phase voltage at at least one of the motor phases with respect to a reference potential while the inverter is switched off;
- and
- using a voltage profile of the motor phase voltage captured to determine whether there is the motor phase fault on one of the motor phases of the motor configuration;
- and
- switching off the power factor correction filter when driving the electronically commutated motor after capturing the motor phase voltage if a maximum possible fault current value for an insulation fault on a motor phase below a predefined limit value has been determined.
A drive circuit for driving an electronically commutated motor, the drive circuit comprising:
- a DC voltage intermediate circuit;
- an inverter connected to said DC voltage intermediate circuit and to said inverter, motor phases of a motor configuration containing the electronically commutated motor can be connected;
- a detection circuit for capturing a motor phase voltage at at least one of the motor phases with respect to a reference potential;
- and
- a controller configured to operate said detection circuit for capturing the motor phase voltage while said inverter is switched off and to determine, on a basis of a voltage profile of the motor phase voltage captured, whether there is a motor phase fault on one of the motor phases of the motor configuration.
Dependencies are inferred from the claim text.