ELECTRONICALLY COMMUTATED MOTOR (ECM) AND METHOD OF CONTROLLING AN ECM
First Claim
1. An electronically commutated motor (ECM) comprising:
- a rotor (208);
a stator (201) for electromagnetically interacting with the rotor (208), which stator is equipped with a stator winding arrangement (202, 204, 206);
a power stage (122) for controlling the currents flowing in the stator winding arrangement (202, 204, 206) during operation;
at least one current measuring element (242, 244) for sensing a measured value for the currents (I UPPER, I LOWER) flowing in the power stage;
an overcurrent measuring element (152, 162) for evaluating an associated measured value and for sensing a current whose absolute value exceeds a predetermined limit value (I_MAX_UPPER, I_MAX_LOWER); and
a holding element (154, 164) associated with the overcurrent measuring element (152, 162), which holding element is configured, upon occurrence of an overcurrent in the associated current measuring element (242, 244), to generate an overcurrent signal (OC_UPPER, OC_LOWER), to store it, and to deliver to the power stage (122) a corresponding signal in order to counteract the overcurrent.
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Accused Products
Abstract
An electronically commutated motor comprises a rotor (208); a stator (201) electromagnetically interacting with the rotor (208), which stator is formed with a stator winding (202, 204, 206); a power stage (122) controlling the currents flowing in the stator winding (202, 204, 206) during operation; at least one current measuring element (242, 244) for sensing a measured value for the currents (I_UPPER, I_LOWER) flowing in the power stage, and an overcurrent measuring element (152, 162) for evaluating an associated measured value and for sensing a current whose absolute value exceeds a predetermined limit value (I_MAX_UPPER, I_MAX_LOWER); a holding element (154, 164) associated with the overcurrent measuring element (152, 162), configured, when an overcurrent occurs in the associated current measuring element (242, 244), to generate an overcurrent signal (OC_UPPER, OC_LOWER), to store the signal, and to deliver a signal to the power stage (122).
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Citations
23 Claims
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1. An electronically commutated motor (ECM) comprising:
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a rotor (208);
a stator (201) for electromagnetically interacting with the rotor (208), which stator is equipped with a stator winding arrangement (202, 204, 206);
a power stage (122) for controlling the currents flowing in the stator winding arrangement (202, 204, 206) during operation;
at least one current measuring element (242, 244) for sensing a measured value for the currents (I UPPER, I LOWER) flowing in the power stage;
an overcurrent measuring element (152, 162) for evaluating an associated measured value and for sensing a current whose absolute value exceeds a predetermined limit value (I_MAX_UPPER, I_MAX_LOWER); and
a holding element (154, 164) associated with the overcurrent measuring element (152, 162), which holding element is configured, upon occurrence of an overcurrent in the associated current measuring element (242, 244), to generate an overcurrent signal (OC_UPPER, OC_LOWER), to store it, and to deliver to the power stage (122) a corresponding signal in order to counteract the overcurrent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of controlling an electronically commutated motor having:
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a rotor (208) and a stator (201) for interacting electromagnetically with the rotor (208), which stator is equipped with a stator winding arrangement (201); and
a power stage (122) for controlling the currents flowing in the stator winding (202, 204, 206) during operation;
comprising the steps of;
A) measuring a current value for at least one current (I UPPER;
I LOWER) flowing in the power stage (122);
B) comparing said measured current value to a predetermined limit value (I_MAX_UPPER;
I_MAX_LOWER);
C) if the measured value exceeds the predetermined limit value, determining the absolute value of the difference between said measured and limit values, and designating said absolute value as an overcurrent;
D) upon occurrence of an overcurrent, generating an overcurrent signal (OC_UPPER, OC_LOWER);
E) storing the overcurrent signal; and
F) delivering a signal corresponding to the overcurrent signal to the power stage (122), in order to counteract the overcurrent there. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification