摘要:
A self-commissioning method for estimating differential inductances in an electric machine, such as e.g. a synchronous reluctance machine or interior permanent magnet machine, with cross-magnetization effects is provided. The electric machine is driven with PWM voltages to explore current plurality of operating points of the currents in the electric machine while keeping the electric machine at standstill or quasi-standstill. At each operating point PWM switching voltage transients are used as a small-signal excitation. Currents of the electric machine are measured by means of oversampling, which permit the reconstruction of the waveforms including the current ripple within a PWM period caused by the PWM switching transients. Finally, the differential inductances at each operating point are determined based on the determined direct and quadrature current waveforms and voltages.
摘要:
A method for torque compensation of a motor associated with a medical instrument includes determining a torque profile for a motor, the torque profile defining torque output as a function of rotor angle and during operation of the motor, compensating for deviations in the torque profile by adjusting an input signal to the motor, the compensating being based on the torque profile and rotor position.
摘要:
A motor drive apparatus equipped with a machine learning device comprises a fan motor and an alarm output unit which provides an indication that it is time to replace the fan motor, wherein the machine learning device comprises a state observing unit which observes the number of revolutions of the fan motor, a reward calculating unit which calculates a reward based on the time that the alarm output unit output an alarm and the time that the fan motor actually failed, an artificial intelligence which judges action value based on an observation result supplied from the state observing unit and on the reward calculated by the reward calculating unit, and a decision making unit which, based on the result of the judgment made by the artificial intelligence, determines whether or not to output an alarm from the alarm output unit.
摘要:
A self-commissioning method for estimating differential inductances in an electric machine, such as e.g. a synchronous reluctance machine or interior permanent magnet machine, with cross-magnetization effects is provided. The electric machine is driven with PWM voltages to explore current plurality of operating points of the currents in the electric machine while keeping the electric machine at standstill or quasi-standstill. At each operating point PWM switching voltage transients are used as a small-signal excitation. Currents of the electric machine are measured by means of oversampling, which permit the reconstruction of the waveforms including the current ripple within a PWM period caused by the PWM switching transients. Finally, the differential inductances at each operating point are determined based on the determined direct and quadrature current waveforms and voltages.
摘要:
A simulation unit receives a series of simulation command values, calculates and outputs a series of simulation values of a position or speed of an object. A control unit provides the simulation unit with the series of simulation command values and displays the series of simulation values. The control unit acquires a series of actual command values output by the control apparatus at predetermined intervals in control cycles for controlling the operation of the object and a series of actual values of the position or speed of the object, acquired by the control apparatus at the predetermined intervals. The control unit provides the simulation unit with the series of actual command values serving as the series of simulation command values. The control unit displays the series of actual values in a mode where the series of actual values can be compared with the series of simulation values.
摘要:
A motor drive system includes a power sub-assembly that comprises power electronic components and driver circuitry for controlling gate drive signals to the power electronic components. A control sub-assembly is removably mounted to the power sub-assembly and comprises control circuitry for implementing a motor control routine for control of an electric motor. In operation, all control signals originate in the control-subassembly, and are transmitted via mating connectors to the power sub-assembly for driving the motor.
摘要:
A method of PWM regulating a motor through a half-bridge drive stage includes sampling the motor current to obtain sampled values during driving intervals or during current decay intervals, and comparing a last sampled value with a current threshold. The motor is coupled in a slow decay electrical path for the duration of a current decay interval if the last sampled value does not exceed the current threshold. Otherwise the motor is coupled in a fast decay electrical path for a portion of the duration of the current decay interval, and is coupled in the slow decay electrical path for a remaining part of the duration of the same current decay interval.
摘要:
The present invention includes a voltage applying step of applying an applied voltage including a DC component and a plurality of frequency components to a PM motor, a motor current detecting step of detecting a motor current flowing depending on the applied voltage, and a current control gain adjusting step of calculating a current control gain based on frequency characteristics of the applied voltage and the motor current. In this manner, a stable current control gain having a high current response can be adjusted within a short period of time.