 |
|
|
|
|
|
 Title: |
US5070283:
Traction motor controller for forklift vehicles
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| Inventor: |
Avitan, Isaac; Vestal, NY
|
| Assignee: |
Raymond, Greene, NY
other patents from RAYMOND (465885) (approx. 2)
News, Profiles, Stocks and More about this company
|
| Published / Filed: |
1991-12-03
/ 1990-05-07
|
| Application Number: |
US1990000519987
|
| IPC Code: |
Advanced:
B60L 11/18;
H02P 7/298;
Core:
H02P 7/18;
more...
IPC-7:
H02P 7/06;
|
| U.S. Class: |
Current:
318/139;
318/493;
388/803;
Original:
318/139;
318/493;
388/803;
|
| Field of Search: |
318/139,255,256,257,268,493,494
388/800,801,802,803,809,810
|
| Priority Number: |
| 1990-05-07 |
US1990000519987 |
|
| Abstract: |
A system for controlling separately excited shunt-wound dc motors, where control is achieved through microprocessor-based independent PWM control of a chopper (armature) and an H-bridge (field). Connected to the armature is an armature voltage amplifier for varying the applied armature voltage. A field voltage amplifier is also provided for determining the direction of motor rotation and varying the voltage applied to the field winding. A first sensor is connected to the motor armature in order to determine the motor rotational speed. A second sensor is connected to the armature circuit in order to determine the armature current. A third sensor is connected to the field circuit in order to determine the field current. A decoupling controller uses the motor speed and armature current information, and adjusts the armature voltage and the field voltage. An optimal controller uses the motor speed, field current and armature current information, and adjusts the armature voltage and the field voltage.
|
| Attorney, Agent or Firm: |
Salzman & Levy ;
|
| Primary / Asst. Examiners: |
Ro, Bentsu;
|
| INPADOC Legal Status: |
Show legal status actions
Family Legal Status Report
|
| Designated Country: |
DE FR GB SE
|
| Family: |
Show 5 known family members
|
First Claim:
Show all 10 claims |
What is claimed is:
1. Apparatus for decoupling speed and torque of a dc motor having separately excited armature and field windings, said apparatus controlling motor speed of said dc motor independently of torque and torque independently of dc motor speed to the limit of the dc motor commutation curve, in combination, comprising:
- a) a dc motor having an armature, an armature winding and a field winding, said armature and field windings being independently controlled;
- b) armature voltage amplifying means operatively connected to the armature of said motor for varying voltage applied thereto;
- c) armature current sensing means directly connected to said armature voltage amplifying means for sensing armature current;
- d) field voltage amplifying means operatively connected to the field winding of said motor for varying voltage applied thereto;
- e) motor speed sensing means operatively connected to said armature of said dc motor for generating a signal representative of rotational speed of said motor armature; and
- f) decoupling control means being operatively connected to said motor speed sensing means, to said armature voltage amplifying means and to said field voltage amplifying means for independently controlling the motor speed independently of torque and torque independently of said motor speed to the limit of the commutation curve of said dc motor.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 21 U.S. patent(s) that reference this one
|
