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Patent

METHOD FOR SENSORLESS OPERATION OF AN ECM, and MOTOR FOR CARRYING OUT

Konstantin Dornhof
TLDR
In this article, an electronically commutated motor (ECM) often employs a Hall sensor for reliable operation, even when the Hall sensor is omitted from a motor having a plurality of stator winding phases and a permanent magnet rotor.
Abstract: 
An electronically commutated motor (ECM) often employs a Hall sensor for reliable operation. Even when a Hall sensor is omitted from a motor having a plurality of stator winding phases ( 24, 26 ) and a permanent-magnet rotor ( 22 ), one can reliably detect direction of rotation of the rotor by the steps of: (a) differentiating a voltage profile obtained by sampling either (1) induced voltage in a presently currentless phase winding or (2) voltage drop at a transistor, through which current is flowing to a presently energized phase winding, and (b) using such a differentiated signal (du — 24 ″/dt, du — 26 ″/dt) to control current flow in an associated phase winding. In this manner, one obtains reliable commutation, even if the motor is spatially separated from its commutation electronics.

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Patent

Method for controlling ecm motor to output constant torque

Yong Zhao
TL;DR: In this article, a method for controlling an ECM motor to output a constant torque was proposed, which includes: 1) entering a target torque value T 0 from an external device, when the motor is in a non-use state, starting the motor, and allowing the microprocessor to acquire an original output voltage value P chopped by a PWM signal; 2) enabling the microprocessors to calculate a target bus current value Itad using the function Itad=F(T,P) according to the target torque values T 0 and the output voltage values P chopped
References
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Patent

Control system and methods for a multiparameter electronically commutated motor

William Roy Archer, +4 more
TL;DR: In this article, the authors describe a system which drives a component of a heating, ventilating, and/or air conditioning (HVAC) system in response to a system control signal such as a temperature signal provided by a thermostat.
Patent

Start-up procedure for a brushless, sensorless motor

Giuseppe Maiocchi
TL;DR: In this paper, a method for starting-up in a desired forward sense of rotation was proposed for a brushless, sensorless, DC motor, while limiting the extent of a possible backward rotation.
Patent

Method and apparatus for electronically commutating a direct current motor without position sensors

Floyd H Wright
TL;DR: In this paper, the authors present a method for electronically commutating a direct current motor without requiring position sensors but rather sampling induced voltage across an unenergized motor winding to derive control signals therefrom.
Patent

Electronic motor controls, laundry machines including such controls and/or methods of operating such controls

Gerald D. Duncan
TL;DR: In this article, a control apparatus and method for an electric motor having sensing devices which sense the frequency and polarity of EMFs in the rotor windings down to a condition where the rotor is in condition for reversing, and causing reversing of the motor when the frequency is such as to allow reversing and the polarits of a selected winding is at or near a zero crossing between positive and negative polarities.
Patent

Combination microprocessor and discrete element control system for a clock rate controlled electronically commutated motor

Robert P. Alley
TL;DR: In this paper, a motor velocity control system employing feedback to maintain actual motor rotational velocity at or near a desired rotational speed implements a clock rate control motor rotation velocity system by advantageously apportioning the required functions between a relatively small, slow speed microprocessor, and a plurality of discrete circuit elements in the form of analog and digital logic devices.