A system and method uses field-oriented control (FOC) of a multi-phase motor to prevent thermal runaway of the thermal battery that powers the motor. An offset is applied to the flux command signal to ensure that the power level drawn from the thermal battery exceeds a minimum power level to avoid thermal runaway. This is done without any additional hardware, hence the reduced cost, inefficiencies and packaging volume of such hardware. In different modes, the offset is applied to prevent thermal runaway regardless of torque production, when the system is in failure and torque production is zero, for variable and intermittent periods when torque production is zero, and during normal operation to augment power drawn to produce torque.

A system and method uses field-oriented control (FOC) of a multi-phase motor to prevent thermal runaway of the thermal battery that powers the motor. An offset is applied to the flux command signal to ensure that the power level drawn from the thermal battery exceeds a minimum power level to avoid thermal runaway. This is done without any additional hardware, hence the reduced cost, inefficiencies and packaging volume of such hardware. In different modes, the offset is applied to prevent thermal runaway regardless of torque production, when the system is in failure and torque production is zero, for variable and intermittent periods when torque production is zero, and during normal operation to augment power drawn to produce torque.

A gate driver integrated circuit includes a high-side region that operates in a first voltage domain according to a first pair of supply terminals that include a first lower supply terminal and a first higher supply terminal; a low-side region that operates in a second voltage domain according to a second pair of supply terminals; at least one termination region that electrically isolates the high-side region from the low-side region; a first electrostatic device arranged in the high-side region and connected to the first pair of supply terminals; a second electrostatic device arranged in the low-side region and connected to the second pair of supply terminals; and a third electrostatic device connected to a lower supply terminal of the first pair of supply terminals and is coupled in series with the first electrostatic device.

A method, system, and apparatus are provided for determining mechanical characteristics of an electric motor and mechanical load with a speed signal modulator, FOC current loop, sensor-less rotor speed estimator, and speed signal demodulator which are configured to provide a q-axis AC reference current, q-axis DC reference current, estimated maximum AC rotor speed, estimated DC rotor speed, estimated phase angle of the AC rotor speed component, and torque constant to a mechanical characteristics estimator which is configured to determine a plurality of load torque parameters for the electric motor and mechanical load which include a combined moment of inertia parameter, a combined static friction, and a combined viscous friction coefficient parameter.

A method, system, and apparatus are provided for determining mechanical characteristics of an electric motor and mechanical load with a speed signal modulator, FOC current loop, sensor-less rotor speed estimator, and speed signal demodulator which are configured to provide a q-axis AC reference current, q-axis DC reference current, estimated maximum AC rotor speed, estimated DC rotor speed, estimated phase angle of the AC rotor speed component, and torque constant to a mechanical characteristics estimator which is configured to determine a plurality of load torque parameters for the electric motor and mechanical load which include a combined moment of inertia parameter, a combined static friction, and a combined viscous friction coefficient parameter.

A motor drive circuit provides a drive signal to an electronically commutated motor. A control circuit the motor drive circuit based on calibration data. The calibration data indicate a relationship between an actual angular position of a rotor of the motor in response to the drive signal and an expected angular position of a rotor of an ideal motor in response to the drive signal.

A motor drive circuit provides a drive signal to an electronically commutated motor. A control circuit the motor drive circuit based on calibration data. The calibration data indicate a relationship between an actual angular position of a rotor of the motor in response to the drive signal and an expected angular position of a rotor of an ideal motor in response to the drive signal.

A gate driver integrated circuit includes a high-side region that operates in a first voltage domain according to a first pair of supply terminals that include a first lower supply terminal and a first higher supply terminal; a low-side region that operates in a second voltage domain according to a second pair of supply terminals; at least one termination region that electrically isolates the high-side region from the low-side region; a first electrostatic device arranged in the high-side region and connected to the first pair of supply terminals; a second electrostatic device arranged in the low-side region and connected to the second pair of supply terminals; and a third electrostatic device connected to a lower supply terminal of the first pair of supply terminals and is coupled in series with the first electrostatic device.

A controller of a power tool is configured to, based on a sampled current of a motor of the power tool, output control signals that change with a change of a position of a rotor of the motor to control a drive circuit of the power tool such that an input voltage and/or a current of the motor changes approximately in a sine wave.

A controller of a power tool is configured to, based on a sampled current of a motor of the power tool, output control signals that change with a change of a position of a rotor of the motor to control a drive circuit of the power tool such that an input voltage and/or a current of the motor changes approximately in a sine wave.