BLDC_HALL3

NAME
SYNOPSIS
DESCRIPTION
FUNCTIONS
PINS
PARAMETERS
SEE ALSO
AUTHOR
LICENSE

NAME

bldc_hall3 − 3-wire BLDC motor driver using Hall sensors and trapezoidal commutation.

SYNOPSIS

The functionality of this component is now included in the generic "bldc" component. This component is likely to be removed in a future release

DESCRIPTION

This component produces a 3-wire bipolar output. This suits upstream drivers that interpret a negative input as a low-side drive and positive as a high-side drive. This includes the Hostmot2 3pwmgen function, which is likely to be the most common application of this component.

FUNCTIONS

bldc-hall3.N (requires a floating-point thread)

Interpret Hall sensor patterns and set 3-phase amplitudes

PINS

bldc-hall3.N.hall1 bit in

Hall sensor signal 1

bldc-hall3.N.hall2 bit in

Hall sensor signal 2

bldc-hall3.N.hall3 bit in

Hall sensor signal 3

bldc-hall3.N.value float in

PWM master amplitude input

bldc-hall3.N.dir bit in

Forwards / reverse selection. Negative PWM amplitudes will also reverse the motor and there will generally be a pattern that runs the motor in each direction too.

bldc-hall3.N.A-value float out

Output amplitude for phase A

bldc-hall3.N.B-value float out

Output amplitude for phase B

bldc-hall3.N.C-value float out

Output amplitude for phase C

PARAMETERS

bldc-hall3.N.pattern u32 rw (default: 25)

Commutation pattern to use, from 0 to 47. Default is type 25. Every plausible combination is included. The table shows the excitation pattern along the top, and the pattern code on the left hand side. The table entries are the hall patterns in H1, H2, H3 order. Common patterns are: 0 (30 degree commutation) and 26, its reverse. 17 (120 degree). 18 (alternate 60 degree). 21 (300 degree, Bodine). 22 (240 degree). 25 (60 degree commutation).

Note that a number of incorrect commutations will have non-zero net torque which might look as if they work, but don’t really.

If your motor lacks documentation it might be worth trying every pattern.

pat	B-A	C-A	C-B	A-B	A-C	B-C
	Phases, Source - Sink
0	000	001	011	111	110	100
1	001	000	010	110	111	101
2	000	010	011	111	101	100
3	001	011	010	110	100	101
4	010	011	001	101	100	110
5	011	010	000	100	101	111
6	010	000	001	101	111	110
7	011	001	000	100	110	111
8	000	001	101	111	110	010
9	001	000	100	110	111	011
10	000	010	110	111	101	001
11	001	011	111	110	100	000
12	010	011	111	101	100	000
13	011	010	110	100	101	001
14	010	000	100	101	111	011
15	011	001	101	100	110	010
16	000	100	101	111	011	010
17	001	101	100	110	010	011
18	000	100	110	111	011	001
19	001	101	111	110	010	000
20	010	110	111	101	001	000
21	011	111	110	100	000	001
22	010	110	100	101	001	011
23	011	111	101	100	000	010
24	100	101	111	011	010	000
25	101	100	110	010	011	001
26	100	110	111	011	001	000
27	101	111	110	010	000	001
28	110	111	101	001	000	010
29	111	110	100	000	001	011
30	110	100	101	001	011	010
31	111	101	100	000	010	011
32	100	101	001	011	010	110
33	101	100	000	010	011	111
34	100	110	010	011	001	101
35	101	111	011	010	000	100
36	110	111	011	001	000	100
37	111	110	010	000	001	101
38	110	100	000	001	011	111
39	111	101	001	000	010	110
40	100	000	001	011	111	110
41	101	001	000	010	110	111
42	100	000	010	011	111	101
43	101	001	011	010	110	100
44	110	010	011	001	101	100
45	111	011	010	000	100	101
46	110	010	000	001	101	111
47	111	011	001	000	100	110

AUTHOR

Andy Pugh

LICENSE

GPL