Abstract: The present application provides a motor control device capable of suppressing noise. A motor control device includes a control unit configured to generate a PWM signal corresponding to each phase (U, V, W) of a motor, an inverter circuit configured to drive the motor, based on the PWM signal, and a current detector connected to a direct-current line of the inverter circuit in series. The control unit includes a current detection unit, a duty cycle setting unit configured to set a duty cycle, based on a detection result of the current detection unit, and a PWM signal generation unit configured to generate the PWM signal. The PWM signal of each phase has a signal level changing at a timing according to the set duty cycle in a first period in one cycle of the PWM signal and has a signal level changing at a different fixed timing in the second period in one cycle of the PWM signal. The current detection unit detects a current (Sd) of the current detector in the second period.

Abstract: A motor controller 100-1 includes an inverter 23, a current detection unit 24, and a current detector 27. The motor controller includes a duty-cycle setting unit 31 that sets a duty cycle of each of a first PWM signal, a second PWM signal, and a third PWM signal, based on a corresponding detected value for a given phase. The motor controller includes a PWM signal generator 32. The PWM signal generator 32 adjusts, upon occurrence of a condition in which a given setting value changes, a time sequence order of timings at which the first PWM signal, the second PWM signal, and the third PWM signal respectively change after a change in the given setting value, to be the same as a time sequence order of timings at which the first PWM signal, the second PWM signal, and the third PWM signal respectively change prior to the change in the given setting value, so that a first energization time period and a second energization time period are ensured within half of one period of the carrier.

Abstract: A motor controller includes an observer that estimates a y-axis electromotive force and a ?-axis electromotive force, during an idle time of a rotor of a motor. The motor controller includes a derivation unit that derives a phase difference between dq axes and y? axes, from the y-axis electromotive force and the ?-axis electromotive force. The motor controller includes an estimation unit that estimates an idling state of the rotor from the phase difference. For example, the estimation unit estimates an idle velocity of the rotor from periodicity of the phase difference. For example, the estimation unit estimates a pole position of the rotor during the idle time, from the phase difference, a sign of the y-axis electromotive force, and a sign of the ?-axis electromotive force.

Abstract: The present application provides a motor control device capable of suppressing noise. A motor control device includes a control unit configured to generate a PWM signal corresponding to each phase (U, V, W) of a motor, an inverter circuit configured to drive the motor, based on the PWM signal, and a current detector connected to a direct-current line of the inverter circuit in series. The control unit includes a current detection unit, a duty cycle setting unit configured to set a duty cycle, based on a detection result of the current detection unit, and a PWM signal generation unit configured to generate the PWM signal. The PWM signal of each phase has a signal level changing at a timing according to the set duty cycle in a first period in one cycle of the PWM signal and has a signal level changing at a different fixed timing in the second period in one cycle of the PWM signal. The current detection unit detects a current (Sd) of the current detector in the second period.

Abstract: A motor controller 100-1 includes an inverter 23, a current detection unit 24, and a current detector 27. The motor controller includes a duty-cycle setting unit 31 that sets a duty cycle of each of a first PWM signal, a second PWM signal, and a third PWM signal, based on a corresponding detected value for a given phase. The motor controller includes a PWM signal generator 32. The PWM signal generator 32 adjusts, upon occurrence of a condition in which a given setting value changes, a time sequence order of timings at which the first PWM signal, the second PWM signal, and the third PWM signal respectively change after a change in the given setting value, to be the same as a time sequence order of timings at which the first PWM signal, the second PWM signal, and the third PWM signal respectively change prior to the change in the given setting value, so that a first energization time period and a second energization time period are ensured within half of one period of the carrier.

Abstract: In a sensorless control of a motor, due to the characteristic of a response frequency, an induced voltage, a magnetic pole position estimation gain, a current control gain, and a speed control gain are closely related. An object of the invention is to enable the induced voltage and the frequency characteristic of a magnetic pole position estimation system to be clearly designed and to theoretically and quantitatively design all of the control gains necessary for the sensorless control so as to solve a problem that a method of designing those parameters cannot be established and the parameters have to be adjusted in a try and error manner. A control device has an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer and a controller controlling the motor on the basis of the estimation induced voltage and the phase error.

Abstract: A calculation apparatus 100 includes an encoder 101 configured to detect rising edges of PWM signals having at least three or more phases in each of the phases, and a register 103 configured to store, at a timing after the PWM signals having the respective phases rise and after AD conversion of a current value of a drive signal of a motor obtained by the PWM signals, a difference value between the AD-converted current value and a previous AD-converted current value for each phase.

Abstract: In a sensorless control of a motor, due to the characteristic of a response frequency, an induced voltage, a magnetic pole position estimation gain, a current control gain, and a speed control gain are closely related. An object of the invention is to enable the induced voltage and the frequency characteristic of a magnetic pole position estimation system to be clearly designed and to theoretically and quantitatively design all of the control gains necessary for the sensorless control so as to solve a problem that a method of designing those parameters cannot be established and the parameters have to be adjusted in a try and error manner. A control device has an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer and a controller controlling the motor on the basis of the estimation induced voltage and the phase error.

Abstract: In a sensorless control of a motor, due to the characteristic of a response frequency, an induced voltage, a magnetic pole position estimation gain, a current control gain, and a speed control gain are closely related. An object of the invention is to enable the induced voltage and the frequency characteristic of a magnetic pole position estimation system to be clearly designed and to theoretically and quantitatively design all of the control gains necessary for the sensorless control so as to solve a problem that a method of designing those parameters cannot be established and the parameters have to be adjusted in a try and error manner. A control device has an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer and a controller controlling the motor on the basis of the estimation induced voltage and the phase error.

Abstract: A calculation apparatus 100 includes an encoder 101 configured to detect rising edges of PWM signals having at least three or more phases in each of the phases, and a register 103 configured to store, at a timing after the PWM signals having the respective phases rise and after AD conversion of a current value of a drive signal of a motor obtained by the PWM signals, a difference value between the AD-converted current value and a previous AD-converted current value for each phase.

Abstract: In a sensorless control of a motor, due to the characteristic of a response frequency, an induced voltage, a magnetic pole position estimation gain, a current control gain, and a speed control gain are closely related. An object of the invention is to enable the induced voltage and the frequency characteristic of a magnetic pole position estimation system to be clearly designed and to theoretically and quantitatively design all of the control gains necessary for the sensorless control so as to solve a problem that a method of designing those parameters cannot be established and the parameters have to be adjusted in a try and error manner. A control device has an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer and a controller controlling the motor on the basis of the estimation induced voltage and the phase error.