摘要:
Speed fluctuations are decreased with a simple method even when a stepping motor (100) having comparatively large torque fluctuations is used. A drive pulse modulating unit (112) which modulates the frequency of a drive pulse to be inputted to the stepping motor (100) is provided. The drive pulse modulating unit (112) modulates the constant frequency of the drive pulse such that the frequency of the drive pulse within excitation-phase one cycle of the stepping motor (100) is: low for a period that is, by 1/8 cycle of the excitation-phase one cycle, before an excitation phase where the vibration of the stepping motor is the maximum; and high in an excitation phase that is by 1/2 cycle subsequent to the excitation phase where the drive pulse frequency is low.
摘要:
A first current supplier supplies a first current to a first phase coil of a motor. A second current supplier supplies a second current to a second phase coil of the motor. A current selector selects a value of the first current and a value of the second current, so as to make constant at least one of a magnitude of a synthetic vector obtained by the selected value of the first current and the selected value of the second current at every microstep driving step of the motor, and an angular interval between synthetic vectors corresponding to adjacent microstep driving steps of the motor.
摘要:
The invention relates to a method for controlling an electric motor (M) associated with a servo-pump (200) of an industrial machine in order to modify a hydraulic pressure applied by the servo-pump (200) to a hydraulic load (10). The electric motor can be moved on the basis of electric actuation signals generated by an electronic control unit (100). The method comprises the steps of: - providing the electronic control unit with a first signal (Pfed) indicative of a current pressure value detected in a hydraulic circuit (11) of the servo-pump; - providing the electronic control unit with a second signal (Pref) indicative of a reference pressure value; - providing the electronic control unit with a third signal (Sfed) indicative of a displacement (θ) angle of a rotor of the motor, detected on a plane orthogonal to the rotation axis from a reference position; - generating, based on said first, second and third signals, a fourth signal (BTref) indicative of a driving torque value which can be applied to the motor and associated with a torque control signal (Tref) configured to control the movement of the motor of the servo-pump. The method further comprises the following steps carried out by the electronic control unit: - comparing the first and the second signals to generate a pressure error signal (PE); - multiplying the pressure error signal by a trigonometric function calculated in relation to the displacement angle obtained from the third signal to generate a first transformed signal (PEt); - integrating over time the first transformed signal to generate a first integrated signal (PEint); - multiplying the first integrated signal by the trigonometric function calculated in relation to the sum of said displacement angle (θ) and an offset angle (θ off ) to generate a second transformed signal (Tff), which is representative of a compensation driving torque value; - adding the second transformed signal to the fourth signal to generate the control signal (Tref).
摘要:
Die Erfindung betrifft eine Antriebsvorrichtung für eine medizinische Pumpe, insbesondere eine Infusionspumpe oder eine enterale Ernährungspumpe, mit einem Zwei-Phasen-Schrittmotor zum Antreiben der medizinischen Pumpe und einer Steuereinrichtung zum Ansteuern des Zwei-Phasen-Schrittmotors. Dabei ist vorgesehen, dass die Steuereinrichtung (23) ausgebildet ist, ein im Wesentlichen sinusförmiges Eingangssignal (W1) und ein im Wesentlichen kosinusförmiges Eingangssignal (W2) zu erzeugen, und einen Klasse-D-Verstärker (5) zum Verstärken der Eingangssignale (W1, W2) und zum Ansteuern des Zwei-Phasen-Schrittmotors (20) mit den Eingangssignalen (W1, W2) aufweist. Auf diese Weise wird eine Antriebsvorrichtung mit einem Schrittmotor geschaffen, die im Betrieb eine geringe Geräuschentwicklung bei dennoch akzeptablem Wirkungsgrad aufweist.
摘要:
A two-phase motor having first and second coil arrays and magnet arrays. In the magnet array, N pole and S pole are arranged alternately while facing the first and second coil arrays. The first and second coil arrays are located while being shifted from each other by odd multiples of Π/2 of electric angle. Each coil in the first and second coil arrays substantially has no core of a magnetic body, and the motor substantially has no yoke of a magnetic body for forming a magnetic circuit.
摘要:
A method of driving a stepping motor comprises dividing a drive signal for each drive step into a plurality of portions in the direction of a time axis, and controlling the drive signal in connection with the plurality of portions thereof in a way of PWM so as to obtain a pattern of a gradual change in a on-duty ratio of the drive signal.
摘要:
A motor control device is provided, which drives a two-phase synchronous motor. The motor control device includes: control current waveform generating means which generates a control current waveform by superposing a fundamental sinusoidal wave and a reluctance torque correction waveform that suppresses the fluctuation of the reluctance torque of the two-phase synchronous motor; and current control signal generating means which generates a current control signal for supplying a current to the windings of the two-phase synchronous motor according to the control current waveform generated by the control current waveform generating means. The reluctance torque correction waveform may have a waveform profile such that an original waveform having a frequency twice that of the fundamental sinusoidal wave and having a phase matched with that of the fundamental sinusoidal wave is full-wave-rectified to the same sign as or a different sign from that of the fundamental sinusoidal wave.
摘要:
There are provided an electromechanical device capable of stably rotating a motor corresponding to a wide range of load applied to the motor, a control method of an electromechanical device, and a control program of an electromechanical device. An electromechanical device (100) includes: a motor (130) including a rotary shaft (132); a rotation sensor (134) that detects in which of a plurality of angle ranges the angular position of the rotary shaft (132) is present; and a motor control unit (191) that controls the rotation of the rotary shaft (132) by transmitting a driving signal to the motor (130) based on the angle range of the rotary shaft (132) detected by the rotation sensor (134). The motor control unit (191) changes the driving signal in a stay period according to the length of the stay period until the rotary shaft (132) exits from one angle range after the rotary shaft (132) enters the one angle range.
摘要:
The invention relates to a method for determining a time mean of a pulse width-modulated current of an electric motor of a motor vehicle. According to said method, a plurality of measuring values of a measuring variable that has a known correlation with the momentary current flowing through the electric motor is detected at several time intervals within the period of pulse width modulation (64) and a time mean of the current is calculated on the basis of these measuring values (74, 76).