US5696430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit, motor, and method generating a signal representing back EMF in an energized motor winding
Assignee: Regal Beloit Electric Motors Inc
•
Filing: 1995-06-06
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Granted: 1997-12-09
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Expires: 2015-06-06
Abstract
Abstract A motor includes a stationary assembly and a rotatable assembly in magnetic coupling relation thereto. The stationary assembly includes a winding, the rotation of the rotatable assembly inducing a back EMF in the winding. A power supply for supplying a voltage across the winding drives a current through the winding. A back EMF sensor connected to the winding generates a back EMF signal representative of the back EMF induced in the winding during periods of time when the voltage is being supplied across the winding. An inverter connected between the power supply and the winding commutates the winding as a function of the back EMF signal, whereby the rotatable assembly rotates. A method of operating the motor and a control circuit for the motor employ the back emf induced in the winding during periods when the voltage is being applied to the winding by the power supply.
Inventors
- 👤 David M. Erdman
- 👤 Eric R. Benedict
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:49
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/04; F; F23; F23N; F23N3/00; F23N3/08; F23N3/082; H02K; H02K29/00; H02K29/03; H02P6/00; H02P6/08; H02P6/085; H02P6/14; H02P6/16; H02P6/18; H02P6/182; H02P6/26; F23N2225/00; F23N2225/04; F23N2225/06; F23N2233/00; F23N2233/02; F23N2233/04; F23N5/00; F23N5/18; H02K2201/00; H02K2201/06
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
176 words
A motor comprising: a stationary assembly and a rotatable assembly in magnetic coupling relation thereto, said stationary assembly including a winding, the rotation of said rotatable assembly inducing a back EMF in said winding; a power supply circuit for supplying a voltage across the winding to drive a current through the winding; a back EMF circuit sensing a magnitude of a voltage applied to the winding by the power supply circuit and sensing a magnitude of the current in the winding due to the applied voltage, said circuit connected to the winding and generating a back EMF signal which is a function of the sensed magnitude of the voltage and the sensed magnitude of the current, said back emf signal representative of the back EMF induced in the winding during periods of time when the voltage is being applied to the winding by the power supply circuit; and an inverter connected between the power supply circuit and the winding for commutating the winding as a function of the back EMF signal, whereby the rotatable assembly rotates.
Claim 2
Dependent Claim
176 words
A motor comprising: a stationary assembly and a rotatable assembly in magnetic coupling relation thereto, said stationary assembly including a winding, the rotation of said rotatable assembly inducing a back EMF in said winding; a power supply circuit for supplying a voltage across the winding to drive a current through the winding; a back EMF circuit sensing a magnitude of a voltage applied to the winding by the power supply circuit and sensing a magnitude of the current in the winding due to the applied voltage, said circuit connected to the winding and generating a back EMF signal which is a function of the sensed magnitude of the voltage and the sensed magnitude of the current, said back emf signal representative of the back EMF induced in the winding during periods of time when the voltage is being applied to the winding by the power supply circuit; and an inverter connected between the power supply circuit and the winding for commutating the winding as a function of the back EMF signal, whereby the rotatable assembly rotates.
Claim 3
Dependent Claim
129 words
The motor of claim 1 wherein the back EMF sensor comprises: a voltage circuit connected to the winding and generating a voltage signal which varies as a function of the magnitude of the voltage applied across the winding; a current circuit connected to the winding and generating a current signal which varies as a function of the magnitude of the current in the winding; a differential circuit connected to the current circuit and generating a differentiated current signal which varies as a function of a derivative of the current in the winding; and a signal combiner connected to the voltage circuit, the current circuit and the differential circuit, and generating the back EMF signal as a function of the voltage signal, the current signal and the differentiated current signal.
Claim 4
Dependent Claim
27 words
The motor of claim 2 wherein the differential circuit generates the differentiated current signal as a function of the first derivative of the current in the winding.
Claim 5
Dependent Claim
14 words
The motor of claim 2 wherein the voltage circuit comprises a voltage dividing network.
Claim 6
Dependent Claim
24 words
The motor of claim 2 wherein the current circuit comprises an inverse voltage follower circuit connected to the winding for generating the current signal.
Claim 7
Dependent Claim
21 words
The motor of claim 2 wherein the current circuit comprises a resistor connected between the power supply circuit and the winding.
Claim 8
Dependent Claim
142 words
The motor of claim 2 further comprising a scaling resistor for scaling the voltage signal, the current signal and the differentiated current signal according to the following equation: V.sub.cmf =V.sub.s -i·r-L·di/dt wherein "V cmf " corresponds to the back EMF signal; wherein "V s " corresponds to a scaled voltage signal, a magnitude of the scaled voltage signal being representative of the voltage applied across the winding; wherein "i·r" corresponds to a scaled current signal, a magnitude of the scaled current signal being representative of a magnitude of the current in the winding multiplied by an internal resistance of the winding; and wherein "L·di/dt" corresponds to a scaled differentiated current signal, a magnitude of the scaled differentiated current signal being representative of a magnitude of a first derivative of the current in the winding multiplied by an internal inductance of the winding.
Claim 9
Dependent Claim
32 words
The motor of claim 2 wherein the winding comprises a single winding having a single phase of operation and wherein the power supply circuit supplies a single phase current through the winding.
Claim 10
Dependent Claim
27 words
The motor of claim 2 wherein the signal combiner sums the voltage signal, the current signal and the differentiated current signal to generate the back EMF signal.
Claim 11
Dependent Claim
228 words
A motor comprising: a stationary assembly and a rotatable assembly in magnetic coupling relation thereto, said stationary assembly including a winding, the rotation of said rotatable assembly inducing a back EMF in said winding; a power supply circuit for supplying a voltage across the winding to drive a current through the winding; a back EMF sensor connected to the winding and generating a back EMF signal representative of the back EMF induced in the winding during periods of time when the voltage is being supplied across the winding, wherein the back EMF sensor comprises: a voltage circuit connected to the winding and generating a voltage signal which varies as a function of the voltage applied across the winding; a current circuit connected to the winding and generating a current signal which varies as a function of the current in the winding; an integrator connected to the voltage circuit and the current circuit, and generating an integrated signal which varies as a function of the voltage signal and the current signal; and a signal combiner connected to the integrator and the current circuit, and generating the back EMF signal as a function of the integrated signal and the current signal; and an inverter connected between the power supply circuit and the winding for commutating the winding as a function of the back EMF Signal, whereby the rotatable assembly rotates.
Claim 12
Dependent Claim
228 words
A motor comprising: a stationary assembly and a rotatable assembly in magnetic coupling relation thereto, said stationary assembly including a winding, the rotation of said rotatable assembly inducing a back EMF in said winding; a power supply circuit for supplying a voltage across the winding to drive a current through the winding; a back EMF sensor connected to the winding and generating a back EMF signal representative of the back EMF induced in the winding during periods of time when the voltage is being supplied across the winding, wherein the back EMF sensor comprises: a voltage circuit connected to the winding and generating a voltage signal which varies as a function of the voltage applied across the winding; a current circuit connected to the winding and generating a current signal which varies as a function of the current in the winding; an integrator connected to the voltage circuit and the current circuit, and generating an integrated signal which varies as a function of the voltage signal and the current signal; and a signal combiner connected to the integrator and the current circuit, and generating the back EMF signal as a function of the integrated signal and the current signal; and an inverter connected between the power supply circuit and the winding for commutating the winding as a function of the back EMF Signal, whereby the rotatable assembly rotates.
Claim 13
Dependent Claim
14 words
The motor of claim 10 wherein the voltage circuit comprises a voltage dividing network.
Claim 14
Dependent Claim
25 words
The motor of claim 10 wherein the current circuit further comprises an inverse voltage follower circuit connected to the winding for generating the current signal.
Claim 15
Dependent Claim
24 words
The motor of claim 10 wherein the integrator integrates a difference between the voltage signal and the current signal to generate the integrated signal.
Claim 16
Dependent Claim
140 words
The motor of claim 10 further comprising a scaling resistor for scaling the voltage signal, the current signal and the integrated signal according to the following equation: Flux=∫(V.sub.s -i·r) dt-L·i wherein "Flux" corresponds to the back EMF induced in the winding; wherein "V s " corresponds to a scaled voltage signal, a magnitude of the scaled voltage signal being representative of the voltage applied across the winding; wherein "i·r" corresponds to a first scaled current signal, a magnitude of the first scaled current signal being representative of a magnitude of the current in the winding multiplied by an internal resistance of the winding; and wherein "L·i" corresponds to a second scaled current signal, a magnitude of the second scaled current signal being representative of the magnitude of the current in the winding multiplied by an internal inductance of the winding.
Claim 17
Dependent Claim
32 words
The motor of claim 10 wherein the winding comprises a single winding having a single phase of operation and wherein the power supply circuit supplies a single phase current through the winding.
Claim 18
Dependent Claim
21 words
The motor of claim 10 wherein the current circuit comprises a resistor connected between the power supply circuit and the winding.
Claim 19
Dependent Claim
32 words
The motor of claim 1 wherein the winding comprises a single winding having a single phase of operation and wherein the power supply circuit supplies a single phase current through the winding.
Claim 20
Independent Claim
124 words
A method of operating a motor in combination with a power supply for supplying a voltage, said method comprising the steps of: sensing a magnitude of a voltage applied to the winding by the power supply and sensing a magnitude of the current in the winding due to the applied voltage, generating a back EMF signal which is a function of the sensed magnitude of the voltage and the sensed magnitude of the current, said back emf signal representative of a back EMF induced in a winding of the motor during periods of time when the voltage from the power source is being applied to the winding by the power supply; and commutating the winding as a function of the generated back EMF signal.
Claim 21
Independent Claim
124 words
A method of operating a motor in combination with a power supply for supplying a voltage, said method comprising the steps of: sensing a magnitude of a voltage applied to the winding by the power supply and sensing a magnitude of the current in the winding due to the applied voltage, generating a back EMF signal which is a function of the sensed magnitude of the voltage and the sensed magnitude of the current, said back emf signal representative of a back EMF induced in a winding of the motor during periods of time when the voltage from the power source is being applied to the winding by the power supply; and commutating the winding as a function of the generated back EMF signal.
Claim 22
Dependent Claim
87 words
The method of claim 18 wherein the back EMF signal generating step comprises the steps of: generating a voltage signal which varies as a function of the voltage applied across the winding; generating a current signal which varies as a function of the current in the winding; generating a differentiated current signal which varies as a function of a derivative of the current in the winding; and generating the back EMF signal as a function of the voltage signal, the current signal and the differentiated current signal.
Claim 23
Independent Claim
146 words
A method of operating a motor in combination with a power supply for supplying a voltage, said method comprising the steps of: generating a back EMF signal representative of a sensed back EMF induced in a winding of the motor during periods of time when the voltage from the power source is being supplied across the winding, wherein the back EMF signal generating step comprises the steps of: generating a voltage signal which varies as a function of the voltage applied across the winding; generating a current signal which varies as a function of the current in the winding; generating an integrated signal which varies as a function of the voltage signal and the current signal; and generating the back EMF signal as a function of the integrated signal and the current signal; and commutating the winding as a function of the generated back EMF signal.
Claim 24
Independent Claim
146 words
A method of operating a motor in combination with a power supply for supplying a voltage, said method comprising the steps of: generating a back EMF signal representative of a sensed back EMF induced in a winding of the motor during periods of time when the voltage from the power source is being supplied across the winding, wherein the back EMF signal generating step comprises the steps of: generating a voltage signal which varies as a function of the voltage applied across the winding; generating a current signal which varies as a function of the current in the winding; generating an integrated signal which varies as a function of the voltage signal and the current signal; and generating the back EMF signal as a function of the integrated signal and the current signal; and commutating the winding as a function of the generated back EMF signal.
Claim 25
Dependent Claim
187 words
A control circuit for a motor having a stationary assembly and a rotatable assembly in magnetic coupling relation thereto, the stationary assembly including a winding, the rotation of the rotatable assembly inducing a back EMF in the winding; said motor for use in combination with a power supply for supplying a voltage across the winding to drive a current through the winding; said control circuit comprising: a back EMF circuit sensing a magnitude of a voltage applied to the winding by the power supply and sensing a magnitude of the current in the winding due to the applied voltage, said circuit connected to the winding and generating a back EMF signal which is a function of the sensed magnitude of the voltage and the sensed magnitude of the current, said back emf signal representative of the back EMF induced in the winding during periods of time when the voltage is being applied to the winding by the power supply; and an inverter connected between the power supply and the winding for commutating the winding as a function of the back EMF signal, whereby the rotatable assembly rotates.
Claim 26
Dependent Claim
187 words
A control circuit for a motor having a stationary assembly and a rotatable assembly in magnetic coupling relation thereto, the stationary assembly including a winding, the rotation of the rotatable assembly inducing a back EMF in the winding; said motor for use in combination with a power supply for supplying a voltage across the winding to drive a current through the winding; said control circuit comprising: a back EMF circuit sensing a magnitude of a voltage applied to the winding by the power supply and sensing a magnitude of the current in the winding due to the applied voltage, said circuit connected to the winding and generating a back EMF signal which is a function of the sensed magnitude of the voltage and the sensed magnitude of the current, said back emf signal representative of the back EMF induced in the winding during periods of time when the voltage is being applied to the winding by the power supply; and an inverter connected between the power supply and the winding for commutating the winding as a function of the back EMF signal, whereby the rotatable assembly rotates.
Claim 27
Dependent Claim
124 words
The control circuit of claim 21 wherein the back EMF sensor comprises: a voltage circuit connected to the winding and generating a voltage signal which varies as a function of the voltage applied across the winding; a current circuit connected to the winding and generating a current signal which varies as a function of the current in the winding; a differential circuit connected to the current circuit and generating a differentiated current signal which varies as a function of a derivative of the current in the winding; and a signal combiner connected to the voltage circuit, the current circuit and the differential circuit, and generating the back EMF signal as a function of the voltage signal, the current signal and the differentiated current signal.
Claim 28
Dependent Claim
241 words
A control circuit for a motor having a stationary assembly and a rotatable assembly in magnetic coupling relation thereto, the stationary assembly including a winding, the rotation of the rotatable assembly inducing a back EMF in the winding; said motor for use in combination with a power supply for supplying a voltage across the winding to drive a current through the winding; said control circuit comprising: a back EMF sensor connected to the winding and generating a back EMF signal representative of the back EMF induced in the winding during periods of time when the voltage is being supplied across the winding, wherein the back EMF sensor comprises: a voltage circuit connected to the winding and generating a voltage signal which varies as a function of the voltage applied across the winding; a current circuit connected to the winding and generating a current signal which varies as a function of the current in the winding; an integrator connected to the voltage circuit and the current circuit, and generating an integrated signal which varies as a function of the voltage signal and the current signal; and a signal combiner connected to the integrator and the current circuit, and generating the back EMF signal as a function of the integrated signal and the current signal; and an inverter connected between the power supply and the winding for commutating the winding as a function of the back EMF signal, whereby the rotatable assembly rotates.
Claim 29
Dependent Claim
241 words
A control circuit for a motor having a stationary assembly and a rotatable assembly in magnetic coupling relation thereto, the stationary assembly including a winding, the rotation of the rotatable assembly inducing a back EMF in the winding; said motor for use in combination with a power supply for supplying a voltage across the winding to drive a current through the winding; said control circuit comprising: a back EMF sensor connected to the winding and generating a back EMF signal representative of the back EMF induced in the winding during periods of time when the voltage is being supplied across the winding, wherein the back EMF sensor comprises: a voltage circuit connected to the winding and generating a voltage signal which varies as a function of the voltage applied across the winding; a current circuit connected to the winding and generating a current signal which varies as a function of the current in the winding; an integrator connected to the voltage circuit and the current circuit, and generating an integrated signal which varies as a function of the voltage signal and the current signal; and a signal combiner connected to the integrator and the current circuit, and generating the back EMF signal as a function of the integrated signal and the current signal; and an inverter connected between the power supply and the winding for commutating the winding as a function of the back EMF signal, whereby the rotatable assembly rotates.
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