Method and apparatus for monitoring the rotating frequency of de-energized induction motors
Patent
·
OSTI ID:871354
- McMurray, PA
- Murrysville, PA
The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor.
- Assignee:
- United States of America as represented by Department of Energy (Washington, DC)
- Patent Number(s):
- US 5714862
- OSTI ID:
- 871354
- Country of Publication:
- United States
- Language:
- English
Similar Records
Method and apparatus for monitoring the rotating frequency of de-energized induction motors
System and method for monitoring and controlling stator winding temperature in a de-energized AC motor
Energy economizer for polyphase induction motors
Patent
·
Mon Feb 02 23:00:00 EST 1998
·
OSTI ID:570427
System and method for monitoring and controlling stator winding temperature in a de-energized AC motor
Patent
·
Mon Dec 26 23:00:00 EST 2011
·
OSTI ID:1034104
Energy economizer for polyphase induction motors
Patent
·
Mon Dec 29 23:00:00 EST 1980
·
OSTI ID:6466103
Related Subjects
/318/324/
additional
apparatus
characteristics
coasting
components
control
controller
conventional
dc
dc voltage
de-energized
detected
electrical
electrical voltages
eliminating
equipment
frequency
induction
induction motor
input
measured
mechanical
mechanical components
method
modifications
monitoring
motor
motor control
motor controller
motors
output
power
power terminal
power terminals
proportional
regulate
relative
residual
rotating
rotational
rotational speed
sensing
signal
speed
tachometer
terminal
terminals
transformed
variable
variable frequency
voltage
voltage proportional
voltage signal
voltages
additional
apparatus
characteristics
coasting
components
control
controller
conventional
dc
dc voltage
de-energized
detected
electrical
electrical voltages
eliminating
equipment
frequency
induction
induction motor
input
measured
mechanical
mechanical components
method
modifications
monitoring
motor
motor control
motor controller
motors
output
power
power terminal
power terminals
proportional
regulate
relative
residual
rotating
rotational
rotational speed
sensing
signal
speed
tachometer
terminal
terminals
transformed
variable
variable frequency
voltage
voltage proportional
voltage signal
voltages