Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
In a motor start control system of the type having a current sending device for producing a signal proportional to the main winding current of said motor and a control circuit responsive to said signal for deenergizing the start winding of said motor when the peak amplitude of said signal is less than a threshold level, the improvement wherein said control circuit includes means for storing said threshhold level as a proportion of the initial peak amplitude of said main winding current.
Claim 2
Dependent Claim
82 words
In a motor start control system of the type having a current sending device for producing a signal proportional to the main winding current of said motor and a control circuit responsive to said signal for deenergizing the start winding of said motor when the peak amplitude of said signal is less than a threshold level, the improvement wherein said control circuit includes means for storing said threshhold level as a proportion of the initial peak amplitude of said main winding current.
Claim 3
Dependent Claim
26 words
The improvement as recited in claim 1 wherein said threshold level is equivalent to 60 percent of said initial peak amplitude of said main winding current.
Claim 4
Independent Claim
76 words
A method of controlling the operation of a motor of the type having a main winding and at least one start winding comprising the steps of: energizing said start winding and main winding, continuously determining peak amplitudes of a waveform proportional to main winding current, storing an initial peak amplitude of said waveform, and deenergizing said start winding when a peak amplitude of said waveform is less than a defined percentage of said stored peak amplitude.
Claim 5
Independent Claim
76 words
A method of controlling the operation of a motor of the type having a main winding and at least one start winding comprising the steps of: energizing said start winding and main winding, continuously determining peak amplitudes of a waveform proportional to main winding current, storing an initial peak amplitude of said waveform, and deenergizing said start winding when a peak amplitude of said waveform is less than a defined percentage of said stored peak amplitude.
Claim 6
Dependent Claim
27 words
The method as recited in claim 3 further including the steps of continuously monitoring said main winding current and converting said current to a sinusoidal voltage waveform.
Claim 7
Dependent Claim
69 words
The method as recited in claim 3 wherein said peak amplitudes of said waveform are determined in accordance with an expression representing said waveform by differentiating between a first and second reference selected within an interval of said waveform wherein the rate of change of the amplitude of said waveform is substantially constant, measuring a time interval between said references, and determining the frequency of oscillation of said waveform.
Claim 8
Dependent Claim
44 words
The method as recited in claim 5 wherein said peak amplitudes of said waveform are determined in accordance with the expression: ##EQU11## wherein: P=peak amplitude Ref 1 =first reference Ref 2 =second reference ω=frequency of oscillation of said waveform ΔT=time interval between said references.
Claim 9
Dependent Claim
25 words
The method as recited in claim 6 further including the step of establishing said initial peak amplitude of said waveform while start winding is energized.
Claim 10
Dependent Claim
44 words
The method as recited in claim 7 further including the step of comparing each determined peak amplitude of said waveform to said stored peak amplitude and deenergizing said start winding when said peak amplitude is less than 60 percent of said stored peak amplitude.
Claim 11
Dependent Claim
30 words
The method as recited in claim 8 further including the step of reenergizing said start winding when said peak amplitude is greater than 60 percent of said stored peak amplitude.
Claim 12
Dependent Claim
115 words
The control system of claim 1, wherein said control circuit includes means for measuring the peak amplitudes of said main winding current including means for differentiating between a first and second reference selected within an interval of the waveform of said main winding current wherein the rate of change of the amplitude of said waveform is substantially constant, means for measuring a time interval between said references, means for determining the frequency of oscillation of said waveform, and a processing unit means responsive to said means for differentiating between said references, said means for measuring said time interval, and said means for determining the frequency of oscillation for calculating a peak amplitude of said waveform.
Claim 13
Dependent Claim
49 words
The circuit as recited in claim 10 wherein said peak amplitude of said waveform is calculated by said processing unit means in accordance with the expression: ##EQU12## wherein: P=peak amplitude Ref 1 =first reference Ref 2 =second reference ω=frequency of oscillation of said waveform ΔT=time interval between said references.
Claim 14
Dependent Claim
27 words
The circuit as recited in claim 10 wherein said first reference is located at a zero crossing of said waveform and therefore is substantially equal to zero.