Permanent magnet motors (PMMs) can develop oscillations during motor startup that can cause damage to electric submersible pump (ESP) components. A system and method are presented for identifying mechanical and/or electrical caused oscillations in a PMM through the analysis of oscillations in current and torque measurements. A control system within a surface motor controller receives current and/or torque measurements from downhole sensors. The control system employs one or more algorithms designed to detect oscillations in the measurements. Upon detecting oscillations that are consistent with oscillations in the motor from mechanical or electrical causes, the control system automatically initiates protective action to prevent damage to the ESP components.

An estimated value of a frequency of a vibration component for automatically adjusting a control unit that suppresses resonance characteristics of a machine is estimated stably and highly reliably without depending on the magnitude of an amplitude of the vibration component and without any risk of arithmetic overflow. A motor control device including an automatic adjustment device that adaptively adjusts a controller included in a motor control system based on a frequency of a vibration component superimposed on a response of the motor control system, the automatic adjustment device including a vibration extraction unit that receives the response of the motor control system and extracts the vibration component from the response of the motor control system; a notch filter unit that receives the vibration component extracted by the vibration extraction unit; an encoding unit; a limiter unit that receives an output of the notch filter unit calculated by the notch filter unit; an adaptive updating unit that receives an output of the encoding unit and an output of the limiter unit; and a unit conversion unit that receives an output of the adaptive updating unit.

An estimated value of a frequency of a vibration component for automatically adjusting a control unit that suppresses resonance characteristics of a machine is estimated stably and highly reliably without depending on the magnitude of an amplitude of the vibration component and without any risk of arithmetic overflow. A motor control device including an automatic adjustment device that adaptively adjusts a controller included in a motor control system based on a frequency of a vibration component superimposed on a response of the motor control system, the automatic adjustment device including a vibration extraction unit that receives the response of the motor control system and extracts the vibration component from the response of the motor control system; a notch filter unit that receives the vibration component extracted by the vibration extraction unit; an encoding unit; a limiter unit that receives an output of the notch filter unit calculated by the notch filter unit; an adaptive updating unit that receives an output of the encoding unit and an output of the limiter unit; and a unit conversion unit that receives an output of the adaptive updating unit.

Provided is a noise remover of a PWM motor without a frequency control filter in a PWM control motor, and more particularly, includes a micom formed in the vehicle terminal and converting to and transmitting the frequency avoiding the radio frequency; a frequency filter for suppressing the noise converted by the micom; a motor part for transmitting the frequency that the frequency filter outputs to a vehicle motor, and operating the motor; and a pulse modulation/demodulation control part for controlling the rotation amount of the vehicle motor inside the motor part, which are divided roughly as four, and rotate a rotor of the motor part without noise by selectively applying the frequency which is not overlapped with radio frequency to a first FET, a second FET, a third FET, and a fourth FET.

Provided is a noise remover of a PWM motor without a frequency control filter in a PWM control motor, and more particularly, includes a micom formed in the vehicle terminal and converting to and transmitting the frequency avoiding the radio frequency; a frequency filter for suppressing the noise converted by the micom; a motor part for transmitting the frequency that the frequency filter outputs to a vehicle motor, and operating the motor; and a pulse modulation/demodulation control part for controlling the rotation amount of the vehicle motor inside the motor part, which are divided roughly as four, and rotate a rotor of the motor part without noise by selectively applying the frequency which is not overlapped with radio frequency to a first FET, a second FET, a third FET, and a fourth FET.

The present invention is directed at a method for operating rotating machinery, such as an electric motor, by means of a variable speed drive (VSD). The variable speed drive is provided for identifying mechanical resonance points by means of a sensor and corresponding speeds of the machinery; storing the speeds at which the identified mechanical resonance points occur; and bypassing the speeds at which the identified mechanical resonance points occur during operation of the rotating machinery. The invention is also directed at a variable speed drive for performing said method.

The present invention is directed at a method for operating rotating machinery, such as an electric motor, by means of a variable speed drive (VSD). The variable speed drive is provided for identifying mechanical resonance points by means of a sensor and corresponding speeds of the machinery; storing the speeds at which the identified mechanical resonance points occur; and bypassing the speeds at which the identified mechanical resonance points occur during operation of the rotating machinery. The invention is also directed at a variable speed drive for performing said method.

A system includes a motor configured to be coupled to a non-rigid load and a control system disposed within, or communicatively coupled to, a drive system configured to control an operation of the motor. The control system includes a processor and a memory accessible by the processor. The memory stores instructions that, when executed by the processor, cause the processor to generate a smooth move input profile to control the operation of the motor based on inputs specifying a desired operation of the motor, apply a notch filter having a notch filter frequency to the smooth move input profile to produce a filtered smooth move input profile, and send a command to the drive system based on the filtered smooth move input profile, wherein the command is configured to adjust the operation of the motor.

A system includes a motor configured to be coupled to a non-rigid load and a control system disposed within, or communicatively coupled to, a drive system configured to control an operation of the motor. The control system includes a processor and a memory accessible by the processor. The memory stores instructions that, when executed by the processor, cause the processor to generate a smooth move input profile to control the operation of the motor based on inputs specifying a desired operation of the motor, apply a notch filter having a notch filter frequency to the smooth move input profile to produce a filtered smooth move input profile, and send a command to the drive system based on the filtered smooth move input profile, wherein the command is configured to adjust the operation of the motor.

A bearing arrangement includes a shaft, at least one contact bearing and at least one non-contact bearing and a controller. The controller is configured to control a magnitude of a restoring force applied to the shaft by the non-contact bearing in accordance with a sensed parameter such that a stiffness of the shaft is modified such that one or more resonance frequencies of the shaft are moved away from one or more external forcing frequencies.