A drive circuit for a brushless DC motor (100) controls at least one of a number of possible operation features of the motor. The drive circuit includes a driver stage for providing a current for a stator coil and varies which of the number of possible operation features of the motor are controlled. The operation features of the motor include inrush current limit control, PWM speed control, analog speed control, detecting a locked rotor condition, setting an alarm following detection of the locked rotor condition, restarting the motor following the locked rotor condition, detecting a low speed condition, and setting an alarm following detection of the low speed condition. Some of the operation features of the motor utilize at least one parameter that defines the desired operation of the feature. The drive circuit further varies the parameters of the operation features without changing the physical configuration of the brushless DC motor.

Drive circuit for a brushless dc motor

An electronically switched motor includes a stator-rotor assembly fitted with three-phase driving windings, a series of switches for powering the windings, and a control circuit suitable for regulating a speed of the motor as a function of a reference speed and a measured speed. The control circuit includes switch control elements to cause each switch to switch on and off in compliance with a repeated sequence selected to power the driving windings as a function of the reference speed and the measured speed. The sequence includes a succession of on/off pulses with a duty ratio. The control circuit is suitable for generating a first switch control mode for controlling the switches so that the switches are in an ON state or receive a succession of ON pulses over a first activation period and a second switch control mode for controlling the switches so that the switches are in an ON state or receive a succession of ON pulses over a second activation period larger than the first activation period. The control circuit applies the first switch control mode and the second switch control mode as a function of the duty ratio.

Electric motor with two modes of power supply switching

The invention relates to a method for controlling a physical variable in an electronically commutated motor, according to which the current is supplied to the stator winding arrangement (102) of the motor in the form of current blocks. The distance (BW) between switch-on command and cut-off command for controlling said current blocks, that is the length (BW) of the control signals, is influenced by a control device, and the current effective value of said current blocks is influenced by adjusting a duty factor (pwm). Upper and lower limits are set to the length (BW) of the control signals. When the control signal becomes shorter than a predetermined lower limit value, the duty factor (pwm) is reduced, thereby reducing the effective value of the current and increasing the length (BW) of the current blocks. When the control signal becomes longer than a predetermined upper limit value, the duty factor (pwm) is increased, thereby increasing the effective value of the current and reducing the length (BW) of the current blocks in compensation thereof.

Method for controlling a physical variable in an electronically commutated motor, and motor for carrying out said method

The invention relates to a method for nonvolatile storage of an operating data value of an electrical motor (32) comprising a microprocessor or microcontroller (23) controlling the commutation thereof, in addition to a nonvolatile storage (74). According to said method, an old operating data value is transmitted from the nonvolatile storage (74) into a volatile storage (97) assigned to the microprocessor (23) when the motor (32) is turned on and stored in said storage as a variable. The variable is updated by the microprocessor in the time intervals in-between commutation processes (Fig. 13). The operating data value stored in the nonvolatile storage (74) is replaced at time intervals by the updated operating data value in line with the current value of the variable. The invention also relates to a motor for implementing said method.

Method for nonvolatile storage of at least one operating data value of an electrical motor, and electrical motor for said method

The invention relates to a method for processing data for an electronically commutated motor, comprising a permanent magnetic rotor, a rotational position sensor, for recording the position of said rotor and a stator with at least one winding branch. A computer of the microprocessor type and a programme which may be executed by said computer are provided for said motor, for carrying out computations. The method involves the following steps: a) the rotor position range in which a current impulse should flow through the at least one winding branch is determined by means of the computer in connection with the programme and the duration (TCurr) of said current impulse determined in repeating steps; b) the time duration (Tpp), dependent on rotational speed is continuously determined, which is necessary for the rotor to pass through a given rotation angular range, c) the ratio of the rotational speed dependent duration (Tpp) and the current impulse duration (Tcurr) is monitored, d) depending on the size of said ratio, at least one given computational operation is carried out in the computer either within (Flag_Fct_Within=1) the duration (TCurr) of a current impulse or in a time period (Flag_Fct_Within=0) outside a current impulse. The invention further relates to a corresponding motor (49).

Method for processing data for an electronically commutated motor and motor for carrying out said method

Die Erfindung betrifft ein Verfahren zum Betreiben eines elektronisch kommutierten Motors (10), welcher einen Rotor (12), einen Stator (14) mit einer mehrstrangigen Wicklungsanordnung (16), zu deren Bestromung eine Endstufe (18) vorgesehen ist, eine erste Leitung (30) und eine zweite Leitung (32) zur Verbindung der Endstufe (18) mit einer Spannungsquelle (24) und einen ersten Regler aufweist. Das Verfahren hat folgende Schritte: Ein erstes Signal (U_34; U_38) wird erfasst, welches einen durch mindestens eine der Leitungen (30; 32) fliesenden Strom (I_N; I_N'; I_M; I_M') charakterisiert; in Abhangigkeit vom ersten Signal (U_34; U_38) wird ein erster Wert ermittelt, welcher den Mittelwert des durch mindestens eine der Leitungen (30; 32) fliesenden Stroms (I_N; I_N'; I_M; I_M') charakterisiert; in dem ersten Regler wird ein erster Stellwert ermittelt, wobei dem ersten Regler der erste Wert als Istwert und ein zweiter Wert als Sollwert zugefuhrt wird; mindestens ein getaktetes Signal (PWM) wird in Abhangigkeit von dem ersten Stellwert erzeugt und an die Endstufe (18) ausgegeben, um den ersten Wert zu beeinflussen. Die Erfindung betrifft auch einen entsprechenden Motor (10).

Elektronisch kommutierter Motor

The invention relates to a method for operating an electronically commuted motor (10), provided with a rotor (12), a stator (14) with a multi-thread winding arrangement (16), provided with an end stage (18) for electrical supply thereof, a first line (30) and a second line (32) for connecting the end stage (18) to a voltage supply (24) and a first regulator. The method comprises the following steps: a first signal (U_34; U_38) is recorded which characterises a current (I_N; I_N'; I_M; I_M') flowing through at least one of the lines (30; 32), depending on the first signal (U_34; U_38) a first value is determined, characterising the mean value of the current (I_N; I_N'; I_M; I_M') flowing through at least one of the lines (30; 32), a first adjustable value is determined in the first regulator, wherein the first regulator is provided the first value as actual value and a second value as set value, and at least one clock signal (PWM) is generated depending on the first adjustable value and supplied to the end stage (18) in order to influence the first value. The invention further relates to a corresponding motor (10).

Electronically commuted motor

The invention relates to a fan. Said fan has a drive motor with a fan rotor, an apparatus for generating a rotation-speed signal (n i) which characterizes the rotation speed of the fan rotor, an apparatus for generating a power signal (P_i) which characterizes the power which is consumed by the drive motor; a first regulator(n_RGL) for regulating the rotation-speed signal (n i) at a predefined setpoint rotation-speed value (n_s); a second regulator (P RGL) for regulating the power signal(P_i) at a predefined setpoint power signal value (P_s) which corresponds to a predefined minimum consumption power (P_min), wherein the first regulator (n_RGL) and the second regulator (P_RGL) output at least one actuation value (SW) to the drive motor and interact in such a way that, during operation, the at least one actuation value (SW) is determined by the first regulator (n_RGL) in a first state; and is determined by the second regulator (P_RGL) in a second state, wherein a first change is made from the first state to the second state when the consumed power is lower than the minimum consumption power (P_min).

Rotation-speed-controlled fan with control of the power consumption of the electric motor

The invention relates to a cross-flow fan having a bearing tube (92) and an air duct (50), which has an air inlet (44), an air outlet (52), an outer wall (48) and an inner wall (56). The cross-flow fan further comprises an external rotor motor (75) with an internal stator (100) and an external rotor (72). The internal stator (100) is connected to the bearing tube (92), and the external rotor (72) has a shaft (90) which is mounted in the bearing tube (92). Furthermore, the cross-flow fan has an impeller (66) which is provided with blades (58) which are arranged on a supporting structure (54) which has a drive connection to the external rotor (72) and which forms the inner wall (56) of the air duct (50), into which air duct (50) the blades (58) of the impeller (66) extend. The cross-flow fan has balancing pockets (62, 76), which are accessible from the pressure side of the impeller (66) and of which a first plurality (76) is arranged on the inner side of the impeller (66) in a first plane in the vicinity of the air inlet (44), and of which a second plurality (62) is arranged on the inner side of the impeller (66) in a second plane in the vicinity of the air outlet (52), in order to permit balancing of the impeller (66) in both planes from the same side (52) of the impeller (66).

Gerald Hogg

Papers

Elektronisch kommutierter Motor

Electronically commuted motor

Rotation-speed-controlled fan with control of the power consumption of the electric motor

Cross-flow fan