 Simplified control for running a switched reluctance motor |
| OF THE PREFERRED EMBODIMENT As illustrated in FIGS. 1 and 8, this invention is a control circuit 10... |
|
| Method and apparatus for implementing sensorless control of a switched reluctance machine |
| In accordance with one embodiment of the present invention a "sensorless" method of controlling a ... |
|
| Seal arrangement between inner and outer tubs of a horizontal axis washing machine |
| The present invention is particularly concerned with preventing foreign objects, which could clog ... |
|
| Method and apparatus for control of a switched reluctance motor |
| In the preferred form, the present invention comprises a method and apparatus for estimating the ... |
|
| Sensorless detection of a locked rotor in a switched reluctance motor |
| The present invention provides a method and a circuit for detecting a locked rotor in a motor such ... |
|
| Permanent magnet rotating electric machine and electrically driven vehicle employing same |
| It is an object of the present invention to provide a permanent magnet rotating electric machine ... |
|
| Switched reluctance motor |
| It is therefore an object of the present invention to provide an improved switched reluctance motor ... |
|
| Motor with reduced clogging torque incorporating stator salient poles and rotor magnetic poles |
| We claim: 1. A motor including a stator field core, wherein the number of magnetic poles of a rotor ... |
|
| Electric power steering control with torque ripple and road disturbance damper |
| The invention is an electric power steering control for a motor vehicle in which torque ripple ... |
|
| Electric motor and electric power steering apparatus employing the electric motor |
| Accordingly, it is an object of the invention to provide an electric motor and electric power ... |
|
|
Controlled magnetic bearing device
| Details |
Inventors: Shinozaki, Hiroyuki;
Assignee: Ebara Corporation (Tokyo, JP)
Primary Examiner: Waks; Joseph
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman & Hattori, LLP
A controlled magnetic bearing apparatus which generates a control signal based on a sensor signal from a displacement sensor for detecting a radial displacement of a rotor to suppress whirling of the rotor due to an external force synchronized with a rotational movement, and can hence support the rotor stably in a levitated state. A controlled magnetic bearing apparatus including a displacement sensor for detecting a radial displacement of the rotor, a first control unit for calculating a first control signal based on a sensor signal from the displacement sensor and outputting the first control signal, a second control unit disposed in parallel with the first control unit for generating a second control signal changed in phase from the sensor signal inputted therein and outputting the second control signal, a signal synthesizer for adding the second control signal outputted from the second control unit to the first control signal outputted from the first control unit to generate a control signal and outputting the control signal to the power amplifier, a power amplifier for supplying an electric current based on the control signal, and an electromagnet for generating a magnetic force based on a signal from the power amplifier. |
|
DETAILED DESCRIPTION I claim: 1.
A controlled magnetic bearing apparatus for radially supporting a rotor, comprising a displacement sensor for detecting a radial displacement of said rotor, a first control unit for calculating a first control signal based on a sensor signal from said displacement sensor and outputting said first control signal, a power amplifier for supplying an electric current based on said first control signal, and an electromagnet for generating a magnetic force based on said electric current from said power amplifier, said controlled magnetic bearing apparatus further comprising: a second control unit disposed in parallel with said first control unit for generating a second control signal changed in phase from said sensor signal inputted therein and outputting said second control signal; a signal synthesizer for adding said second control signal outputted from said second control unit to said first control signal outputted from said first control unit to generate a control signal and outputting said control signal to said power amplifier; and means for changing a phase amount in said second control unit to a value suitable for suppressing movement of said rotor, based on external force/displacement transfer characteristics of a magnetic bearing.
2.
A controlled magnetic bearing apparatus according to claim 1, characterized in that: said second control unit comprises: a filter for extracting a rotational frequency component from said sensor signal; a phase adjustor for adjusting a phase of an output signal from said filter; a signal generator including a comparator for comparing an output signal from said phase adjustor with a reference electric potential; and a gain adjustor for adjusting an amplitude of an output signal from said signal generator.
3.
A controlled magnetic bearing apparatus according to claim 2, characterized in that: a rotational speed proportional gain adjustor for giving a gain proportional to a rotational speed is used as said gain adjustor.
4.
A controlled magnetic bearing apparatus according to claim 2, characterized in that: a second rotational frequency component extractor is provided at the downstream side of a signal generator including a comparator in said second control unit
|
| Related patents |
|
|
Method and apparatus for controlling the rotational speed and phase of synchronous motors
Briefly stated and according to an aspect of this invention, this aim is achieved by sensing the motion of the poles with respect to the stator by means of an inductive ...
|
|
|
Washing machine with direct drive system
Among the various objects and features of the present invention may be noted the provision of an improved, yet simplified drive for washing machines. Another object of ...
|
|
|
Induction motor
It is an object of the present invention to provide an inexpensive, rigid induction motor which eliminates a torque ripple therefrom and can serve as a highly precise, ...
|
|
|
Method for retaining a magnet within a motor assembly
OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a six pole motor 11 is assembled from drive end head 13, an armature or armature assembly 15, a frame 17, six permanent ...
|
|
|
Servo control system
It is, therefore, an object of the invention to provide a servo control system capable of separating a control system effectively and suitably at a suitable place in the ...
|
|
|
Electronic washer control including automatic balance, spin and brake operations
In accordance with certain embodiments of this invention, the size of the imbalance within the wash load is minimized, the extent and nature of any remaining imbalance ...
|
|
|
Sensorless rotor position measurement in electric machines
According to the invention a position sensing system for an electric machine with one or more phases, comprises at least one current transducer arranged for measurement ...
|
|
|
Stator of dynamo-electric machine
The object of the present invention is therefore to provide a stator of a dynamo-electric machine whereby a winding can be wound in alignment outside the stator with ...
|
|
|
Insulating member for a core of a motor
We claim: 1. A single insulating member for a core of a motor, the single insulating member electrically insulating a stator core of the motor, formed with a plurality ...
|
|
|
Stator core having a plurality of connected circumferentially segmented cores and method and apparatus for assembling same
In order to attain the above-described first object, the present invention is a stator core having a plurality of circumferentially segmented cores, each of the ...
|
|
|
Generators or Motors 
