 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 ... |
|
| Electrical angle detecting apparatus and method, and motor control apparatus |
| The invention is intended to solve the aforementioned problems. It is an object of the invention to ... |
|
| Motor |
| The motor of the invention comprises a stator core having plural teeth and slots provided among ... |
|
| Permanent magnet motor |
| This invention has been achieved to solve the above-mentioned problem, and it is an object of the ... |
|
| Interior permanent magnet synchronous motor |
| The present invention has been made in view of the foregoing disadvantage of the prior art. A... |
|
| Electric machine with integrated power electronics |
| Referring now to FIG. 1, an electric machine 10 is illustrated in a circumference mount ... |
|
|
Electronic washer control including automatic balance, spin and brake operations
| Details |
Inventors: Payne, Thomas R.; Rice, Steven A.; McKnight, Jr., Richard E.; Wead, William W.;
Assignee: General Electric Company (Louisville, KY)
Primary Examiner: Coe; Philip R.
Assistant Examiner:
Attorney, Agent or Firm: Houser; H. Neil
A fabric washing machine includes a container to receive fabrics and washing fluid. An SRM is operatively connected to oscillate and rotate the container. Ribs formed on the center post of the container agitate the fabrics and fluid as the container is oscillated. Just prior to a spin extraction operation the container is oscillated with an asymmetric pattern that travels further in one direction than in the other. To minimize wrapping of the fabrics about the center post the asymmetric pattern is periodically reversed. Also, just prior to the spin operation the motor is operated at a constant torque and the time to accelerate the container from one speed to a higher speed is measured one or more times. The inertia of the load, and thus the size of the fabric load, is calculated from the time measurements. The motor then is operated at a constant torque to accelerate the container from a threshold speed for a predetermined period of time and the final speed of the container is measured. This speed measurement is compared to the predetermined terminal speed of a comparable balanced load to determine the degree of unbalance in the load of fabrics. The terminal speed of the spin operation is then set based upon the determined load size and degree of unbalance. |
|
DETAILED DESCRIPTION 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 is determined, the terminal spin speed is adjusted in accordance with the remaining imbalance and the rotating action of the machine is braked in a controlled manner at the conclusion of the extraction operation (or in the event the machine lid is opened).
In accordance with one aspect of the invention, the machine redistributes the wash load to minimize the unbalance of the fabric load by employing an operation sequence executed upon the completion of the agitation phase of the wash cycle and before the commencement of the spin phase of the wash cycle.
The load unbalance is minimized by use of an asymmetrical agitation operation in the presence of water to redistribute the fabrics evenly throughout the basket.
Following a brief period of the asymmetrical agitation, the water is pumped from the system and the clothing load is spun at a high velocity for water extraction purposes.
In accordance with another aspect of the invention, a sensorless imbalance detection scheme, is implemented, which uses the velocity based load size determination operation described in co-pending U.
S.
patent application Ser.
No.
07/723,277, Electronic Washer Control Including Automatic Load Size Determination, Fabric Blend Determination and Adjustable Washer Means, filed on Jun.
28, 1991; which application is incorporated herein by reference.
The speed response of the basket, and thus the motor, for a constant torque excitation of the motor is linear and independent of imbalances in the low speed ranges.
In the higher speed ranges, the speed response becomes a function of any imbalance present in the clothes load, as well as the size of the load.
The imbalance is determined by use of the load size information contained in the lower portion of the speed response and the imbalance magnitude information contained in the upper portion of the speed response
|
|
Generators or Motors 
