Eaton Corporation

Eaton Intelligent Power Limited

Bharath Kumar Suda

James David

Asheesh Soni

John Kimmel Vandervoort

A fault detection method for a multi-phase motor system applies a first duty cycle to first phase coil windings and applies a second duty cycle to second phase coil windings. The second duty cycle differs from the first duty cycle by a first difference value D. A first current Iis measured. A third duty cycle is applied to third phase coil windings and a fourth duty cycle is applied to the second phase coil windings. The fourth duty cycle differs from the third duty cycle by a second difference value D. A second current Iis measured. Line-to-line resistances R, Rare calculated using the difference values D, D, the measured currents, I, and a measured DC voltage VDC. After determining a resistance difference &#x394;R between the line-to-line resistances R, R, a comparison to a first non-zero threshold Tindicates a fault.

Electrical motor coil short detection and protection

A method for providing electromagnetic compatibility to a motor control circuit is provided. A base pulse width modulated signal is selected to apply to a motor control circuit, and comprises a duty cycle for controlling an affiliated motor. Sensed system conditions are inputted for selecting a hopping frequency and a hopping amplitude of an electro magnetic compatibility management signal. The hopping frequency and the hopping amplitude are overlayed on to the base pulse width modulated signal to create a control pulse width modulated signal. The hopping frequency dithers the frequency of the control pulse width modulated signal. The hopping amplitude restricts the amplitude of the frequency dither.

Method to reduce electromagnetic interference in switching circuit applications

Methods and systems for detecting and clearing battery power failure of an electric clutch actuator (ECA) include use of a capacitor connected to the ECA. The capacitor is connected to the ECA such that when the ECA and a battery configured to output a battery voltage are connected together a capacitor voltage matches the battery voltage and when the ECA and the battery are disconnected from one another the capacitor voltage differs from the battery voltage. A loss of battery connection is detected upon a difference between the capacitor voltage and the battery voltage exceeding a threshold.

Method and system for detecting and clearing battery power failure of electric clutch actuator

Methods and systems for operating a motor having a rotor rotatable relative to a stator include commutating the motor to cause the rotor to rotate to a known position. While the rotor is at the known position, a position of an encoder magnet configured to rotate with the rotor is measured. Subsequent commutation of the motor is adjusted to take into account a difference between the known position of the rotor and the measured position of the encoder magnet.

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Pune, India

Bharath Kumar Suda