A control unit for operating an electrical machine which includes a rotor, a stator, and power electronics. The power electronics have a plurality of switching elements, by which the phases of the stator winding are connected/connectible electrically to an electrical energy store. The control unit includes first and second processing units and is configured to determine control signals for controlling the switching elements, using the processing units. The first processing unit is configured to determine a magnitude of a setpoint voltage vector for the phases based on a setpoint rotational speed of the rotor and an actual rotational speed of the rotor. The second processing unit is connected to the first processing unit so as to be able to communicate with it, and being configured to determine the control signals as a function of the magnitude of the setpoint voltage vector and an actual angle of rotation of the rotor.

A motor controller comprises a switch circuit and a control unit. The switch circuit is coupled to a motor for driving the motor. The control unit generates a control signal to control the switch circuit. The motor controller determines a non-excitation time. When the motor is in a locked state, the motor controller enables the non-excitation time to be a variable value. The motor controller utilizes the non-excitation time to achieve a lock protection function. The motor controller determines whether the motor is in the locked state by detecting a rotor speed or a rotor temperature. Moreover, the motor controller further comprises a driving signal, where the driving signal has the non-excitation time.

Examples of methods and systems for compensating for the timing delay caused by the winding impedance of the motor coils and/or for non-ideal rotor magnet shapes and positions are disclosed. The example methods and systems may include generating a synthesized commutation signal compensating for non-ideal magnet shapes and positions (e.g., asymmetrical magnet positions) on a rotor and/or compensates for the timing delay caused by the winding impedance of the motor coils.

A hand-held power tool includes an electronically commutated motor including a motor winding. Motor electronics of the hand-held power tool are configured to electronically commutate the motor winding using a selected one of a plurality of electrical precontrol angles, thereby adapting the motor winding to different mechanical load conditions of the electronically commutated motor.

A motor control device includes: a plurality of sensors detecting a rotation position of a rotor and outputting a position detection signal; a rotational speed determination part determining whether a rotational speed of a brushless motor is equal to or less than a predetermined threshold value based on the position detection signal; and a motor control part. An energization control part included in the motor control part uses, between a first mode and a second mode, different sensor signals serving as a trigger for an energization timing of each phase. In the first mode, an energization timing to a second phase is advanced relative to a timing at which the position detection signal of a first sensor turns on. In the second mode, an energization timing to the second phase is retarded relative to a timing at which the position detection signal of the first sensor turns on.

A motor drive receives a position feedback signal from an encoder operatively connected to the motor. The motor drive executes a speed regulator module on a first periodic interval to achieve desired operation of the motor, and the motor drive executes an additional module at a second periodic interval, occurring more frequently than the first periodic interval, to increase the resolution of the position feedback. The position feedback signal is provided as or converted to counts. The motor drive maintains a first counter with a running total of each count received as well as a second counter which generates a higher resolution value than the first counter. During each second periodic interval the motor drive increments the high-resolution counter by the number of actual counts detected within the corresponding first periodic interval. This high-resolution counter is used by the speed regulator to obtain desired operation of the motor.

Systems and methods described herein provide for controlling a conduction angle applied to a motor, such as a power tool motor. Operations for controlling the conduction angle includes receiving by a motor controller, a desired speed signal, and monitoring a speed of the power tool motor. The operation further includes a motor controller determining an error value between the desired speed signal and the monitored speed and determining a conduction angle signal based on the error value. The operation also includes the motor controller determining whether the conduction angle signal is greater than the error value and increasing a conduction angle of the power tool motor in response to the conduction angle signal being determined to be greater than the error value.

A motor drive control device 1_2 includes a target point determination unit 12_2 determining a target point P of zero crossing of a coil current Iu of a U phase based on a position detection signal Shu, a current zero crossing point estimation unit 14_2 estimating a zero crossing point Q of the coil current Iu of the U phase by detecting a change in a current direction of the coil current Iu of the U phase at a predetermined timing in every cycle of a PWM signal, an adjustment instruction signal generation unit 19_2 generating at least one of a phase adjustment instruction signal Sp for instructing phase adjustment of the coil current Iu and a frequency adjustment instruction signal Sf for instructing frequency adjustment of the PWM signal according to a phase difference Δφ between the target point P and the zero crossing point Q such that the phase difference is within a predetermined range, and a drive control signal generation unit 16_2 generating a drive control signal Sd based on at least one of the phase adjustment instruction signal Sp and the frequency adjustment instruction signal Sf.

A shift range control apparatus switches a shift range by controlling a motor. The shift range control apparatus includes an angle calculator, a speed calculator and a drive controller. The angle calculator calculates a motor angle based on a detected value of a rotational angle sensor. The speed calculator calculates a motor rotational speed based on the detected value of the rotational angle sensor. The drive controller executes a stationary phase energization control to stop the motor in response to the motor angle reaching a stationary phase energization start position. The drive controller sets a stationary energization phase being a stationary phase of the motor in the stationary phase energization control, according to the motor rotational speed when the motor angle reaches the stationary phase energization start position.

A motor adjustment method adjusts a motor driven by a controller. The motor adjustment method includes acquiring forward rotation information indicating a change in a value of a current flowing through a driver at the time of a rotor rotating in a forward direction when a Hall sensor setting position is changed, acquiring reverse rotation information indicating a change in a value of a current flowing through the driver at the time of the rotor rotating in a reverse direction when the Hall sensor setting position is changed, and determining a Hall sensor adjustment position on the basis of the forward rotation information and the reverse rotation information. The Hall sensor adjustment position indicates a position obtained by adding a correction amount to the Hall sensor setting position.