A control method for a centrifuge is performed by a motor drive unit to drive a motor of the centrifuge using pulses from an angle sensor. The method has a start phase, a regulated acceleration phase, a holding phase, a regulated deceleration phase, a regulated gentle deceleration phase, and a position adjustment phase.

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 control apparatus controlling an opening and closing member for a vehicle includes a drive control unit operating an opening and closing member of the vehicle by a motor serving as a drive source, and a catch detection unit detecting a catch of a foreign object caught by the opening and closing member in response to a current value of the motor. The drive control unit includes a motor control signal output unit outputting a motor control signal for supplying a drive power to the motor, and an advance-angle value setting unit setting an advance-angle value for advancing a phase of the motor control signal. The advance-angle value setting unit includes an advance-angle value increase prohibition unit prohibiting increase setting of the advance-angle value in a case where the current value of the motor reaches an advance-angle value increase prohibition current value.

A method of controlling an electric motor assembly includes receiving sensor feedback that is based at least in part on electrical properties of a variable frequency power signal provided to the electric motor assembly. The method also includes adjusting the phase angle of the variable frequency power signal provided to the electric motor assembly based at least in part on the sensor feedback. The method also includes determining an operational status of the electric motor assembly that receives the variable frequency power signal based at least in part on the sensor feedback.

A waveform control unit outputs a signal for driving a brushless DC motor by intermediate value energization to a waveform output unit, and outputs a signal for driving a brushless DC motor by sine wave energization to the waveform output unit when the signal in which the rotation position of the rotation reference is detected is acquired from the element, and the waveform control unit applies voltage corresponding to a sine value of an angle of a winding of one phase of n-phase windings when the brushless DC motor is to be driven by intermediate value energization, and outputs a signal for applying voltage corresponding to a sine value of an angle having similar phase difference as the sine wave energization drive with respect to the angle to the rest of the windings.

Provided is a method for controlling a brushless motor (101) in a power tool system. The brushless motor (101) includes multiple phase windings (u, v, w). The control method includes: operating the brushless motor (101) in each driving state for a period of time separately; measuring a voltage of a higher-voltage one of two phase input ends to which a driving voltage is applied and defining this voltage as a higher-voltage end voltage; measuring a voltage of a phase input end of one of the multiple phase windings which is kept floating when the driving voltage is applied and defining this voltage as a floating end voltage; determining whether values of the higher-voltage end voltage and the floating end voltage meet a preset condition; and when the values of the higher-voltage end voltage and the floating end voltage meet the preset condition, using any one of the multiple phase windings not serving as the current floating phase as a next floating phase. This method helps improve the running efficiency of the brushless motor (101).

A motor control apparatus includes: an excitation unit configured to excite a plurality of excitation phases of each of a plurality of motors that include first to Nth motors and a control unit configured to control the excitation unit so as to perform detection excitation processing for sequentially exciting the plurality of excitation phases for each excitation cycle during each excitation period, regarding each of the first to Nth motors, and thereby detect rotor positions of the respective first to Nth motors. When detecting rotor positions of the respective first to Nth motors, the control unit delays a start timing of the detection excitation processing of at least one motor out of the first to Nth motors relative to a start timing of the detection excitation processing of another motor by a period shorter than the excitation period.

An electric power tool may include a three-phase brushless motor configured to drive a tool, a gear reducer provided between the motor and the tool. The gear reducer is configured to selectively change a reduction ratio from the motor to the tool between a first reduction ratio and a second reduction ratio. The electric power tool may further include a motor controller configured to drive the motor with rectangular waves. The motor controller is configured to selectively change a conduction angle of each rectangular wave between at least a first conduction angle and a second conduction angle.

A control device for controlling a stepping motor includes at least one processor which function as a control unit configured to control the stepping motor through a first control method or a second control method by using a control signal, wherein the memory configured to store a plurality of locus data indicating a relationship between an advance angle and a rotation speed of the stepping motor at each waveform of the control signal, the advance angle being a phase difference between a phase corresponding to a rotation position of the stepping motor and a phase of the control signal, and wherein the control unit select one piece of locus data from the plurality of locus data stored in the memory before switching a control method between the first control method and the second control method.

The apparatus employs magnetoresistive sensors (28) to generate a sinusoid having a time-varying instantaneous frequency commensurate with the instantaneous frequency of the angular displacement of a motor's rotating shaft (40). The resultant signal is then fed to a mixture of fixed-phase-shifting circuits (22) whose outputs are then amplified by voltage-controlled amplifiers and fed to independently wired stator phases (56).