JP2014054171A5

JP2014054171A5 -

Info

Publication number: JP2014054171A5
Application number: JP2013177902A
Authority: JP
Filing date: 2013-08-29
Publication date: 2016-10-13
Anticipated expiration: 2033-08-29

Claims

Generating a motor command signal during the commutation interval of the brushless DC motor;
Adjusting the common attribute of the non-zero pulses so that the non-zero pulses constituting the motor command signal are not uniform in order to correct the current waveform of the motor;
DC brushless motor control method comprising:

2. The DC brushless motor control method according to claim 1, wherein the common attribute is a pulse width.

2. The DC brushless motor control method according to claim 1, wherein the common attribute is a pulse amplitude.

2. The DC brushless motor control method according to claim 1, wherein the plurality of non-zero pulses include a first pulse and a second pulse having a high value duration longer than that of the first pulse. Control method.

5. The DC brushless motor control method according to claim 4, wherein the plurality of non-zero pulses are generated during the commutation interval and after the second pulse, and the high value duration is shorter than that of the second pulse. DC brushless motor control method including 3 pulses.

5. The DC brushless motor control method according to claim 4, wherein the common attribute is adjusted according to the position of the brushless DC motor.

7. The DC brushless motor control method according to claim 6, wherein the position of the brushless DC motor is converted into a time segment counter signal, the time segment counter signal is corrected and further converted into an analog signal.

8. The DC brushless motor control method according to claim 7, wherein the analog signal multiplied by a speed control signal for adjustment is compared with an oscillation signal and then supplied to the brushless DC motor.

2. The DC brushless motor control method according to claim 1, wherein the brushless DC motor is a fan motor.

8. The DC brushless motor control method according to claim 7, wherein the content of the correction is selected from a plurality of correction profiles according to an operation parameter.

2. The DC brushless motor control method according to claim 1, further comprising a step of stopping execution of the common attribute adjustment step according to occurrence of a deteriorated state.

Generating a motor command signal with a constant pulse width over a specified rotation angle range of the brushless DC motor in a pre-start state or a pre-restart state;
Changing the pulse width of the motor command signal between the first and second non-zero values over the designated rotation angle range when the rotor speed of the brushless DC motor exceeds a predetermined speed limit;
DC brushless motor control method comprising:

The DC brushless motor control method according to claim 12, wherein the pulse width change step described above is
Reducing the pulse width in the first rotation angle region within the commutation interval as the specified rotation angle region;
Then extending the pulse width in the second rotation angle region within the commutation interval;
Thereafter, suppressing one or more types of pulse train attributes in the third rotation angle region within the commutation interval;
DC brushless motor control method.

14. The DC brushless motor control method according to claim 13, wherein a rotor torque generated in the brushless DC motor is large in the second rotation angle region and small in the first rotation angle region and the third rotation angle region. Brushless motor control method.

A DC brushless motor control method according to claim 12,
Stopping the execution of the above-mentioned pulse width change step according to the occurrence of the deterioration state;
Thereafter, when the rotor speed of the brushless DC motor exceeds a predetermined speed limit, resuming execution of the pulse width changing step;
DC brushless motor control method comprising:

A time segment generator that generates a binary output based on the segment position signal of the brushless DC motor;
A pulse width modulation generator having a correction unit, a digital-to-analog converter, an oscillator and a comparator for storing correction coefficients relating to binary output generated by the time segment generator;
An integrated circuit comprising:

17. The integrated circuit according to claim 16, wherein a signal indicating a position is received from a Hall effect sensor attached to the brushless DC motor and converted into a divided position signal of the brushless DC motor.

17. The integrated circuit of claim 16, wherein the time segment generator is
An edge counter that counts the time difference between the two hole edges most recently detected by the edge detector;
A latch that captures the time interval counted by the edge counter and outputs a binary value,
A divider for determining the duration of one time segment by dividing the binary output according to the number of bits in the correction unit;
A time segment counter that generates a binary output that gradually increases through the time segment at a speed corresponding to the time difference between the two most recent hole edges and supplies the binary output to the correction unit;
An integrated circuit.

An integrated circuit according to claim 16, comprising:
The correction unit has a correction table for correcting the motor current by generating a binary correction coefficient for each time segment of the motor control signal based on the binary output generated by the time segment generator;
A digital-to-analog converter converts a binary correction factor corresponding to each time segment of the motor control signal into a time-variable and position-dependent analog voltage;
An integrated circuit in which a comparator generates a motor command signal subjected to position correction pulse width modulation by comparing a time-variable and position-dependent analog voltage with a triangular oscillation wave.

An integrated circuit according to claim 19, comprising
In the correction table, multiple correction coefficient profiles corresponding to each time segment of binary output are registered so that they can be individually selected based on one or more types of operation parameters.
An integrated circuit in which the digital-to-analog converter is invalidated according to an operation state so that a motor command signal without position correction pulse width modulation is generated.