IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0515317
(1990-04-18)
|
|
발명자
/ 주소 |
- Erdman David M. (Fort Wayne IN) Beatty James A. (Fort Wayne IN) Patel Amritlal H. (Fort Wayne IN)
|
| 출원인 / 주소 |
- General Electric Company (Fort Wayne IN 02)
|
| 인용정보 |
피인용 횟수 :
67 인용 특허 :
88 |
초록
▼
Control circuit for an electronically commutated motor which has a rotatable assembly and further has a stationary assembly with a plurality of winding stages having terminals for energization, and switches for applying a voltage to one or more of the terminals of the winding stages at a time and co
Control circuit for an electronically commutated motor which has a rotatable assembly and further has a stationary assembly with a plurality of winding stages having terminals for energization, and switches for applying a voltage to one or more of the terminals of the winding stages at a time and commutating the winding stages in a preselected sequence to rotate the rotatable assembly. A preselected sequence of winding stages are left correspondingly unpowered so that a plurality of the winding stages are unpowered at some time. The winding stages generate back emf signals and also couple electrical signals from each energized winding stage to the unpowered winding stages which signals can interfere with detection of back emf for position sensing purposes. The control circuit includes a first circuit for selecting at least two of the unpowered winding stages which have electrical signals coupled to them that have a predetermined relationship in polarity and magnitude. A second circuit produces an electrical output from the voltages on the winding stage terminals of the winding stages selected, so that the electrical signals coupled from each energized winding stage are substantially canceled when they have the predetermined relationship while the back emf is preserved for position sensing substantially free from interference from the electrical signals that are coupled from each energized winding stage to the unpowered winding stages. Other control circuits, electronically commutated motor systems and methods of control and operation are also disclosed.
대표청구항
▼
A control circuit for an electronically commutated motor having a rotatable assembly and further having a stationary assembly with a plurality of winding stages having terminals for energization, and switching means for applying a voltage to one or more of the terminals of the winding stages at a ti
A control circuit for an electronically commutated motor having a rotatable assembly and further having a stationary assembly with a plurality of winding stages having terminals for energization, and switching means for applying a voltage to one or more of the terminals of the winding stages at a time and commutating the winding stages in a preselected sequence to rotate the rotatable assembly, leaving a preselected sequence of winding stages correspondingly unpowered so that a plurality of the winding stages are unpowered at some time, wherein the winding stages generate back emf signals and also couple electrical signals from each energized winding stage to the unpowered winding stages which signals can interfere with detection of back emf for position sensing purposes, the control circuit comprising: means for selecting at least two of the unpowered winding stages which have electrical signals coupled to them that have a predetermined relationship in polarity and magnitude; and means for producing an electrical output from the voltages on the winding stage terminals of the winding stages selected, so that the electrical signals coupled from each energized winding stage are substantially canceled when they have the predetermined relationship while the back emf is preserved for position sensing substantially free from interference from the electrical signals that are coupled from each energized winding stage to the unpowered winding stages. A control circuit for an electronically commutated motor to be energized from a power source and including a stationary assembly having a plurality of winding stages connected to a neutral adapted to be electronically commutated in a preselected sequence, and a rotatable assembly associated in selective magnetic coupling relation with the winding stages, each winding stage having a terminal and a terminal voltage associated therewith, the control circuit comprising: commutating means for applying a voltage from the power source to energize the motor so that a winding stage is temporarily powered and another winding stage is temporarily unpowered, terminating the application of voltage to a temporarily powered winding stage in response to a first control signal and advancing in the sequence in response to a second control signal to effect rotation of the rotatable assembly; means responsive to the terminal voltage of a temporarily unpowered winding stage for producing a sensing output which is a function of angular position of the rotatable assembly; voltage divider means for the neutral for providing a voltage generally proportional to the voltage on the neutral to said means for producing the sensing output; means for establishing a first electrical level representative of a first position of the rotatable assembly at which a temporarily powered winding stage is to be deenergized, and a second electrical level representative of a second position of the rotatable assembly at which said commutating means is to advance in the sequence; and means for comparing the sensing output with the first and second electrical levels to produce the first and second control signals for said commutating means when the first and second positions are respectively reached by the rotatable assembly. Control circuit for an electronically commutated motor having a rotatable assembly and further having a stationary assembly with a plurality of winding stages, and switching means for commutating the winding stages in a preselected sequence to rotate the rotatable assembly, the control circuit comprising: shift register means having a serial input, a set of parallel inputs, a control input to select the serial input or parallel inputs for entry, and outputs for supplying a parallel digital signal representing a commutation in the sequence, said shift register means to be protected from electrical interference which could cause the outputs to supply a parallel digital signal unrepresentative of any commutation in the sequence; means for supplying a parallel digital signal representing a particular commutation in the sequence to the set of parallel inputs of said shift register means; and means for clocking said shift register means, said control input of said shift register means connected to respond to at least one of the outputs and said serial input connected to respond to at least one of the outputs so that if any unrepresentative parallel digital signal appears which does not represent any commutation in the sequence at the outputs of said shift register means, the unrepresentative parallel digital signal is replaced by another parallel digital signal representing a commutation in the sequence when said means for clocking next clocks said shift register means. Control circuit for an electronically commutated motor having a rotatable assembly and further having a stationary assembly with a plurality of winding stages, position sensing means for repeatedly generating a sensing signal generally representative of rotation of the rotatable assembly, and commutating means responsive to the sensing signal for commutating the winding stages in a preselected sequence to energize the winding stages and thereby rotate the rotatable assembly, the control circuit comprising: oscillator means for producing oscillator pulses; means for frequency dividing the oscillator pulses to supply lower frequency pulses, said means for frequency dividing having a reset input for repeated resetting by said sensing signal, so that when the rotatable assembly is turning at least as fast as a predetermined spin rate the sensing signal is generated at a repetition rate for resetting that prevents the lower frequency pulses from being supplied and otherwise allows the lower frequency pulses to be supplied when the sensing signal is generated at a lower repetition rate; means responsive to the lower frequency pulses when they occur for producing an electrical signal generally representing an accumulated number of the lower frequency pulses; and means for comparing with a predetermined value the electrical signal representing the accumulated number of the lower frequency pulses, and for supplying a disabling signal for a predetermined period of time for the commutating means after the predetermined value is reached by the electrical signal, to prevent energization of the motor during that predetermined period of time. A control circuit for an electronically commutated motor having a rotatable assembly and further having a stationary assembly with a plurality of winding stages for energization, and switching means for applying a voltage from a voltage source to one or more of the winding stages at a time and commutating the winding stages in a preselected sequence to rotate the rotatable assembly at a speed dependent on the energization applied to the winding stages, the control circuit to be compatible with alternative external control devices indicating desired speed, and the control circuit comprising: means for generating pulse width modulated pulses to control the switching means, the pulses modulated in width as a function of an analog speed control signal; and means for supplying the analog speed control signal with respect to a common to said means for generating the pulse width modulated pulses, said means for supplying including a capacitor and active device circuit means having an input resistively connected to a terminal for the voltage source, said input also for connection to any of the external control devices, and an output resistively connected to said capacitor so that said capacitor develops the analog speed control signal when the input of said active device circuit means is connected to any of the following external control devices: A) pulse generator with a duty cycle representative of desired speed, B) variable voltage source representative of desired speed, or C) variable resistance representative of desired speed.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.