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ZHCSDA8E January 2015 – May 2018 DRV10975

PRODUCTION DATA.

封裝選項(xiàng)

機(jī)械數(shù)據(jù) (封裝 | 引腳)

PWP|24
- MPDS372A
RHF|24
- MPQF137H

散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)

PWP|24
- PPTD111R

訂購信息

8.4.1.1 Motor Phase Resistance

For a wye-connected motor, the motor phase resistance refers to the resistance from the phase output to the center tap, R_{PH_CT} (see Figure 8).

DRV10975 DRV10975Z wye_conn_motor_R_LVSCP2.gif

Figure 8. Wye-Connected Motor Phase Resistance

For a delta-connected motor, the motor phase resistance refers to the equivalent phase to center tap in the wye configuration, which is represented as R_Y. R_{PH_CT} = R_Y (see Figure 9).

For both the delta-connected motor and the wye-connected motor, calculating the equivalent R_{PH_CT} is easy by measuring the resistance between two phase terminals (R_{PH_PH}), and then dividing this value by two as shown in Equation 1.

Equation 1. R_{PH_CT} = ½R_{PH_PH}

DRV10975 DRV10975Z delta_conn_motor_R_LVSCP2.gif

Figure 9. Delta-Connected Motor and the Equivalent Wye Connections

The motor phase resistance (R_{PH_CT}) must be converted to a 7-bit digital register value Rm[6:0] to program the motor phase resistance value. The digital register value can be determined as follows:

Convert the motor phase resistance (R_{PH_CT}) to a digital value where the LSB is weighted to represent 7.35 mΩ: Rmdig = R_{PH_CT} / 0.00735.
Encode the digital value such that Rmdig = Rm[3:0] << Rm[6:4].

The maximum resistor value, R_{PH_CT}, that can be programmed for the DRV10975 is 14.1 Ω, which represents Rmdig = 1920 and an encoded Rm[6:0] value of 0x7Fh. The minimum resistor the DRV10975 supports is 0.0294 Ω, R_{PH_CT}, which represents Rmdig = 4.

For convenience, the encoded value for Rm[6:0] can also be obtained from Table 2.

Table 2. Motor Phase Resistance Look-Up Table

R_{PH_CT} (Ω)	RM[6:0]	HEX	R_{PH_CT} (Ω)	RM[6:0]	HEX	R_{PH_CT} (Ω)	RM[6:0]	HEX
0	000 0000	00	0.235	010 1000	28	1.88	101 1000	58
0.0073	000 0001	01	0.264	010 1001	29	2.11	101 1001	59
0.0147	000 0010	02	0.294	010 1010	2A	2.35	101 1010	5A
0.0220	000 0011	03	0.323	010 1011	2B	2.58	101 1011	5B
0.0294	000 0100	04	0.352	010 1100	2C	2.82	101 1100	5C
0.0367	000 0101	05	0.382	010 1101	2D	3.05	101 1101	5D
0.0441	000 0110	06	0.411	010 1110	2E	3.29	101 1110	5E
0.0514	000 0111	07	0.441	010 1111	2F	3.52	101 1111	5F
0.0588	000 1000	08	0.47	011 1000	38	3.76	110 1000	68
0.0661	000 1001	09	0.529	011 1001	39	4.23	110 1001	69
0.0735	000 1010	0A	0.588	011 1010	3A	4.7	110 1010	6A
0.0808	000 1011	0B	0.646	011 1011	3B	5.17	110 1011	6B
0.0882	000 1100	0C	0.705	011 1100	3C	5.64	110 1100	6C
0.0955	000 1101	0D	0.764	011 1101	3D	6.11	110 1101	6D
0.102	000 1110	0E	0.823	011 1110	3E	6.58	110 1110	6E
0.110	000 1111	0F	0.882	011 1111	3F	7.05	110 1111	6F
0.117	001 1000	18	0.94	100 1000	48	7.52	111 1000	78
0.132	001 1001	19	1.05	100 1001	49	8.46	111 1001	79
0.147	001 1010	1A	1.17	100 1010	4A	9.4	111 1010	7A
0.161	001 1011	1B	1.29	100 1011	4B	10.3	111 1011	7B
0.176	001 1100	1C	1.41	100 1100	4C	11.2	111 1100	7C
0.191	001 1101	1D	1.52	100 1101	4D	12.2	111 1101	7D
0.205	001 1110	1E	1.64	100 1110	4E	13.1	111 1110	7E
0.22	001 1111	1F	1.76	100 1111	4F	14.1	111 1111	7F