The servo controller is provided with a command reception unit and a servo control computation unit. In a measurement mode, the command reception unit asynchronously receives with every command reception period a counter output by the control device with every command update period. The servo controller is further provided with an event detection unit configured to detect the occurrence of an event which entails variation in reception intervals of the counter in the measurement mode, a deviation calculation unit configured to calculate a deviation amount between respective clocks of the control device and the servo controller, based on an occurrence period of the event and the command reception period, in the measurement mode, and a reception period adjustment unit configured to adjust the command reception period based on the deviation amount in an operation mode.

A system for reducing jitter in a motion control system which includes at least one drive device programmed or configured to receive data associated with a time base of a controller device in the motion control system, determine the frequency of the time base of the controller device based on the data associated with the time base of the controller device, determine a frequency adjustment to be made to a time base of the at least one drive device based on the frequency of the time base of the controller device, adjust a frequency of the time base of the at least one drive based on the frequency adjustment, and provide data associated with the time base of the at least one drive device.

A motor driving apparatus includes an amplifier receiving, from a detector, a sine wave shaped signal detected in response to rotation of a motor, and amplifying the signal with a set amplification factor, an A/D converter for performing digital conversion by sampling the signal amplified by the amplifier at a sampling timing in a predetermined cycle, an amplification factor setting part for changing setting of the amplification factor of the amplifier, and an amplification factor set timing command part for issuing a command with respect to a timing for changing the setting of the amplification factor by the amplification factor setting part. The amplification factor set timing command part issues the command with respect to the timing so that a waveform stabilizing period until distortion in a waveform of the signal occurring when the amplification factor setting part changes the setting is stabilized does not overlap with the sampling timing.

A motor driving apparatus includes an amplifier receiving, from a detector, a sine wave shaped signal detected in response to rotation of a motor, and amplifying the signal with a set amplification factor, an A/D converter for performing digital conversion by sampling the signal amplified by the amplifier at a sampling timing in a predetermined cycle, an amplification factor setting part for changing setting of the amplification factor of the amplifier, and an amplification factor set timing command part for issuing a command with respect to a timing for changing the setting of the amplification factor by the amplification factor setting part. The amplification factor set timing command part issues the command with respect to the timing so that a waveform stabilizing period until distortion in a waveform of the signal occurring when the amplification factor setting part changes the setting is stabilized does not overlap with the sampling timing.

A device for determining a first angle between a rotor and a stator, having inputs for reading amplitudes of electrical signals detected via a sensor system and representing a first angle, wherein the device has an angle estimator for estimating a second angle, the device determines amplitudes representing the second, estimated angle, the device has at least one controller with which at least one difference between the first angle and the second, estimated angle can be minimized, and the second, estimated angle can be provided via an output.

A device for determining a first angle between a rotor and a stator, having inputs for reading amplitudes of electrical signals detected via a sensor system and representing a first angle, wherein the device has an angle estimator for estimating a second angle, the device determines amplitudes representing the second, estimated angle, the device has at least one controller with which at least one difference between the first angle and the second, estimated angle can be minimized, and the second, estimated angle can be provided via an output.

To provide a motor driving apparatus capable of obtaining high detection resolution irrespective of whether a frequency of a signal from a detector is high or low. A motor driving apparatus for driving a motor includes an amplifier circuit for receiving a signal from a detector for outputting information including a position and a speed of the motor as the signal, and amplifying the received signal with a set amplification factor, a frequency detecting part for detecting a frequency of the signal, and an amplification factor setting part for changing setting of the amplification factor of the amplifier circuit according to the frequency detected by the frequency detecting part.

To provide a motor driving apparatus capable of obtaining high detection resolution irrespective of whether a frequency of a signal from a detector is high or low. A motor driving apparatus for driving a motor includes an amplifier circuit for receiving a signal from a detector for outputting information including a position and a speed of the motor as the signal, and amplifying the received signal with a set amplification factor, a frequency detecting part for detecting a frequency of the signal, and an amplification factor setting part for changing setting of the amplification factor of the amplifier circuit according to the frequency detected by the frequency detecting part.

A method and a device are used to generate a control command. A resolution base value and a resolution-tick corresponding function are created. A first operation frequency value, a minimal tick value and a resolution value are received to calculate a resolution ratio and a second operation frequency. A conversional tick value is calculated. If or not the conversional tick value is greater than or equal to the minimal tick value is determined. If the conversion tick value is smaller than the minimal tick value, the minimal tick value, the conversional tick value and the second operation frequency are used to calculate a conversional operation frequency. A conversional resolution ratio is calculated according to the first operation frequency and the conversional operation frequency, and also a modified tick value is calculated. The control command is output according to the modified tick value, the first operation frequency and the conversion operation frequency.

A method and a device are used to generate a control command. A resolution base value and a resolution-tick corresponding function are created. A first operation frequency value, a minimal tick value and a resolution value are received to calculate a resolution ratio and a second operation frequency. A conversional tick value is calculated. If or not the conversional tick value is greater than or equal to the minimal tick value is determined. If the conversion tick value is smaller than the minimal tick value, the minimal tick value, the conversional tick value and the second operation frequency are used to calculate a conversional operation frequency. A conversional resolution ratio is calculated according to the first operation frequency and the conversional operation frequency, and also a modified tick value is calculated. The control command is output according to the modified tick value, the first operation frequency and the conversion operation frequency.