Method for the detection of abnormalities of electric motors
First Claim
1. Method for error detection of a brushless electric motor,wherein at least one first motor parameter is measured or determined, and a second estimated motor parameter is estimated on the basis of the first motor parameter, wherein the second estimated motor parameter is compared to a nominal current producing a motor torque, and an error of the electric motor is found out according to the comparison, wherein an estimated current producing a motor torque and a quantity derived therefrom is the second estimated motor parameter and is estimated based on at least one phase motor current and a rotor position or a phase position of the electric motor, and wherein an absolute rotor position or an absolute phase position relative to a stator of the electric motor is defined by measuring a respective actual phase position variation of the rotor relative to the stator and determining the absolute phase position therefrom.
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Abstract
In a method for error detection of a brushless electric motor, at least one first motor parameter is measured or determined, and a second, estimated motor parameter is estimated on the basis of the first motor parameter. The second, estimated motor parameter is compared to a second, measured or determined motor parameter. An error of the electric motor can be found out according to the comparison.
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Citations
7 Claims
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1. Method for error detection of a brushless electric motor,
wherein at least one first motor parameter is measured or determined, and a second estimated motor parameter is estimated on the basis of the first motor parameter, wherein the second estimated motor parameter is compared to a nominal current producing a motor torque, and an error of the electric motor is found out according to the comparison, wherein an estimated current producing a motor torque and a quantity derived therefrom is the second estimated motor parameter and is estimated based on at least one phase motor current and a rotor position or a phase position of the electric motor, and wherein an absolute rotor position or an absolute phase position relative to a stator of the electric motor is defined by measuring a respective actual phase position variation of the rotor relative to the stator and determining the absolute phase position therefrom.
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3. Method for error detection of a brushless electric motor,
wherein at least one first motor parameter is measured or determined, and a second estimated motor parameter is estimated on the basis of the first motor parameter, wherein the second estimated motor parameter is compared to a nominal current producing a motor torque, and an error of the electric motor is found out according to the comparison, wherein an estimated current producing a motor torque and a quantity derived therefrom is the second estimated motor parameter and is estimated based on at least one phase motor current and a rotor position or a phase position of the electric motor, and wherein the at least one phase motor current is estimated based on phase voltages in consideration of induced countervoltages proportional to rotational speed.
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4. Method for error detection of a brushless electric motor,
wherein at least one first motor parameter is measured or determined, and a second estimated motor parameter is estimated on the basis of the first motor parameter, wherein the second estimated motor parameter is compared to a nominal current producing a motor torque, and an error of the electric motor is found out according to the comparison, wherein an estimated current producing a motor torque and a quantity derived therefrom is the second estimated motor parameter, and wherein a temperature of the electric motor or windings of the electric motor or both is measured and also taken into consideration in estimating the estimated current producing the motor torque.
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