EP0515974A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Two-phase brushless DC motor controller
Assignee: Individual
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Filing: 1992-05-20
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Granted: —
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Expires: 2012-05-20
Abstract
Abstract 5n7 Control circuits for operating a two-phase brushless dc motor from a dc power source are described. Control of the motor is optimized by detecting induced back EMF of the two phases to sense rotor phase position. It is common knowledge that the voltage developed across the terminals of a permanent magnet motor can be represented by a winding resistance, a winding inductance and a generated back EMF. In two-phase brushless dc and permanent magnet stepping motors, the induced back EMFs of the two phases are displaced from each other by 90 electrical degrees. Thus, by detecting the back EMFs of the two phases, an accurate relative position of rotor-to-stator can be determined at any rotor position. Commutation of the motor phases and closed loop control of the motor and load is achieved by accurately sensing the back EMFs of the two phases. Also, phase position of the permanent magnet rotor poles is detected by integrating the sensed back EMFs of the two phases to produce quadrature sinewaves the magnitudes of which are constant relative to rotor speed.
Inventors
- 👤 David L. Kruse
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 14:48
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P6/182; H02P6/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A motor controller system comprising, a motor including a drive winding means and a sense winding means. said sense winding means transformer coupled to said drive winding means whereby the voltage drop across the resistive component of said drive winding means is removed, subtracting means for removing the voltage drop across the inductive component of said drive winding means, and phase position signal generating means connected to said subtracting means to produce a phase position signal which is the integral of the back EMF voltage of said motor which is controlled thereby.
Claim 2
Dependent Claim
92 words
A motor controller system comprising, a motor including a drive winding means and a sense winding means. said sense winding means transformer coupled to said drive winding means whereby the voltage drop across the resistive component of said drive winding means is removed, subtracting means for removing the voltage drop across the inductive component of said drive winding means, and phase position signal generating means connected to said subtracting means to produce a phase position signal which is the integral of the back EMF voltage of said motor which is controlled thereby.
Claim 3
Dependent Claim
19 words
The system recited in claim 1 including, feedback means for supplying said phase position signal to said motor controller.
Claim 4
Dependent Claim
24 words
The system recited in claim 1 including, transconductance amplifiers for receiving said phase position signal in order to control the torque of said motor.
Claim 5
Dependent Claim
45 words
The system recited in claim 1 including, current amplifier means connected to each phase of said motor to receive the integrated back EMF and to selectively supply a signal to said phase position signal generating means in order to develop a first torque signal (RUN).
Claim 6
Dependent Claim
48 words
The system recited in claim 1 including, current amplifier means connected to each phase of said motor to receive the integrated back EMF from that phase and to selectively supply a signal to another phase position signal generating means in order to develop a second torque signal (HOLD).
Claim 7
Dependent Claim
19 words
The system recited in claim 1 including, attenuation means for controlling the magnitude of said phase position signal .
Claim 8
Dependent Claim
19 words
The system recited in claim 1 including, polarity means for controlling the polarity of said phase position signal .
Claim 9
Dependent Claim
71 words
A phase position detector circuit comprising, active integrator means adapted to be connected to the single ended output of the secondary winding of a motor phase, summing means connected to receive the output signal from said active integrator means and a component of current from the primary winding of said motor phase, and output means connected to said summing means to produce an output signal which is independent of motor excitation.
Claim 10
Dependent Claim
71 words
A phase position detector circuit comprising, active integrator means adapted to be connected to the single ended output of the secondary winding of a motor phase, summing means connected to receive the output signal from said active integrator means and a component of current from the primary winding of said motor phase, and output means connected to said summing means to produce an output signal which is independent of motor excitation.
Claim 11
Dependent Claim
78 words
A control circuit comprising, motor means with a plurality of phases, phase position detector circuit means connected to receive signals from each of said phases, power amplifier means connected to receive signals from each of said phases, multiplier means connected to supply signals to respective ones of said power amplifier means as a function of the operating mode of said control circuit, and controller means for supplying control signals to determine the operating mode or said control circuit.
Claim 12
Dependent Claim
78 words
A control circuit comprising, motor means with a plurality of phases, phase position detector circuit means connected to receive signals from each of said phases, power amplifier means connected to receive signals from each of said phases, multiplier means connected to supply signals to respective ones of said power amplifier means as a function of the operating mode of said control circuit, and controller means for supplying control signals to determine the operating mode or said control circuit.
Claim 13
Dependent Claim
20 words
The control circuit recited in claim 9 including, integrator bias circuit means connected to said phase position detector circuit means.
References Cited (Backward Citations)
No citation records indexed.
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