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; a low-voltage region the operates in a third voltage domain; at least one termination region that electrically isolates the high-side region from the low-side region and the low-voltage 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.

An apparatus and a method for detecting a motor rotor position are provided. The method for detecting a motor rotor position includes: transmitting test current commands and preset angles to a field oriented control circuit before a motor rotor rotates, to enable the field oriented control circuit to generate feedback currents, determining current peaks of the feedback currents, and comparing the current peaks of the feedback currents, and when determining that a current peak of a feedback current with a largest current peak in the feedback currents is greater than a current peak of another feedback current, outputting, according to a largest current peak current command corresponding to the feedback current with the largest current peak, a preset angle corresponding to the largest current peak current command as an initial angle position of the motor rotor.

An apparatus and a method for detecting a motor rotor position are provided. The method for detecting a motor rotor position includes: transmitting test current commands and preset angles to a field oriented control circuit before a motor rotor rotates, to enable the field oriented control circuit to generate feedback currents, determining current peaks of the feedback currents, and comparing the current peaks of the feedback currents, and when determining that a current peak of a feedback current with a largest current peak in the feedback currents is greater than a current peak of another feedback current, outputting, according to a largest current peak current command corresponding to the feedback current with the largest current peak, a preset angle corresponding to the largest current peak current command as an initial angle position of the motor rotor.

The disclosure relates to an autonomous apparatus, moving and performing preset work in a defined working area, the autonomous apparatus including an energy module supplying energy to the autonomous apparatus, a motor, a sensor circuit, and a control circuit, the motor obtaining the energy from the energy module, to drive the autonomous apparatus to move and/or work in the working area, the sensor circuit detecting working parameters and environmental parameters of the autonomous apparatus, and transmitting detection results to the control circuit, the control circuit controlling the operation of the motor according to a signal transmitted by the sensor circuit, where the motor is a sensorless brushless motor, and before the motor rotates, the control circuit measures a resistance value of the motor, and estimates, one the basis of the resistance value of the motor, a rotor position of the motor, so as to control the operation of the motor.

A method includes configuring a motor drive system with a motor/generator and a plurality of inverters coupled to the motor/generator, configuring a plurality of active harmonic planes to generate a torque on each of the active harmonic planes, and applying a harmonic plane synchronization mechanism to the plurality of active harmonic planes so that torque components and magnetizing components of currents are controlled in coordination on different active harmonic planes to output a desired torque from the motor/generator.

A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor, and apply a drive signal to the power switch circuit to control a commutation of the motor based on the detected angular position of the rotor. If the supply of power to the motor is turned OFF to cause the motor to slow down and is turned back ON while the rotor speed exceeds a speed threshold, the controller electronically brakes the motor for a time interval to measure the phase current of the motor and detects the angular position of the rotor based on the measured phase current.

A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor, and apply a drive signal to the power switch circuit to control a commutation of the motor based on the detected angular position of the rotor. If the supply of power to the motor is turned OFF to cause the motor to slow down and is turned back ON while the rotor speed exceeds a speed threshold, the controller electronically brakes the motor for a time interval to measure the phase current of the motor and detects the angular position of the rotor based on the measured phase current.

In a rotary electric machine, magnets provided in a core generate circumferentially arranged magnetic poles. Each magnetic pole defines d- and q-axes. The d-axis represents a center of the corresponding magnetic pole. The rotary electric machine includes an armature including an armature winding. Each magnet includes a magnet body having opposing first and second flux effective surfaces. The first flux effective surface is a surface out of which magnetic flux flows. The second flux effective surface into which magnetic flux flows. The magnet body has a thickness defined as a minimum distance between the first and second flux effective surfaces. The magnet body has easy axes of magnetization. A length of a line along at least one of the easy axes of magnetization between the first and second flux effective surfaces is longer than the thickness of the magnet body.

In a rotary electric machine, magnets provided in a core generate circumferentially arranged magnetic poles. Each magnetic pole defines d- and q-axes. The d-axis represents a center of the corresponding magnetic pole. The rotary electric machine includes an armature including an armature winding. Each magnet includes a magnet body having opposing first and second flux effective surfaces. The first flux effective surface is a surface out of which magnetic flux flows. The second flux effective surface into which magnetic flux flows. The magnet body has a thickness defined as a minimum distance between the first and second flux effective surfaces. The magnet body has easy axes of magnetization. A length of a line along at least one of the easy axes of magnetization between the first and second flux effective surfaces is longer than the thickness of the magnet body.

The present invention provides control of a synchronous machine with non-sinusoidal current-voltage profiles. The synchronous machine is controlled in a field-oriented coordinate system. In this case, the transformation between field-oriented coordinate system and stator-oriented coordinate system is effected by specific, adapted transformations which take account of the non-sinusoidal signal profiles during the driving of the synchronous machine, such that the latter correspond to current-voltage profiles progressing in a constant fashion in the field-oriented coordinate system. What is achieved thereby is that the non-sinusoidal current-voltage profiles need not be taken into account in any way in the design of the control system in the field-oriented coordinate system.