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ZHCSH31B August 2017 – February 2018 DRV10987

PRODUCTION DATA.

封裝選項

機械數據 (封裝 | 引腳)

PWP|24
- MPDS372A

散熱焊盤機械數據 (封裝 | 引腳)

PWP|24
- PPTD264C

訂購信息

8.4.1.1 Motor Phase Resistance (R_{PH_CT})

For a wye-connected motor, the motor phase resistance refers to the resistance from the phase output to the center tap, R_{PH_CT} (denoted as R_{PH_CT} in Figure 13).

Figure 13. 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. In Figure 14, it is denoted as R_Y. R_{PH_CT} = R_Y.

For both the delta-connected motor and the wye-connected motor, the easy way to get the equivalent R_{PH_CT} is to measure the resistance between two phase terminals (R_{PH_PH}), and then divide this value by two, R_{PH_CT} = ½ R_{PH_PH}.

Figure 14. 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 9.67 mΩ: Rmdig = R_{PH_CT} / 0.00967.
Encode the digital value such that Rmdig = RMValue[3:0] << RMShift[2:0].

The maximum resistor value, R_{PH_CT}, that can be programmed for the DRV10987 device is 18.5 Ω, which represents Rmdig = 1920 and an encoded Rm[6:0] value of 0x7Fh. The minimum resistor the DRV10987 device supports is 0.029 Ω, R_{PH_CT}, which represents Rmdig = 3.

For convenience, the encoded value for Rm[6:0] can also be obtained from Table 3.

Table 3. Motor Phase Resistance Look-Up Table

RM[6:0] {RMShift[2:0], RMValue[3:0]}		R_{PH_CT} (Ω)	RM[6:0] {RMShift[2:0], RMValue[3:0]}		R_{PH_CT} (Ω)	RM[6:0] {RMShift[2:0], RMValue[3:0]}		R_{PH_CT} (Ω)
BINARY	HEX	R_{PH_CT} (Ω)	BINARY	HEX	R_{PH_CT} (Ω)	BINARY	HEX	R_{PH_CT} (Ω)
000 0000	0x00	0	0101000	0x28	0.3104	1011000	0x58	2.4832
000 0001	0x01	0.0097	010 1001	0x29	0.3492	101 1001	0x59	2.7936
000 0010	0x02	0.0194	010 1010	0x2A	0.388	101 1010	0x5A	3.104
000 0011	0x03	0.0291	010 1011	0x2B	0.4268	101 1011	0x5B	3.4144
000 0100	0x04	0.0388	010 1100	0x2C	0.4656	101 1100	0x5C	3.7248
000 0101	0x05	0.0485	010 1101	0x2D	0.5044	101 1101	0x5D	4.0352
000 0110	0x06	0.0582	010 1110	0x2E	0.5432	101 1110	0x5E	4.3456
000 0111	0x07	0.0679	010 1111	0x2F	0.582	101 1111	0x5F	4.656
000 1000	0x08	0.0776	011 1000	0x38	0.6208	110 1000	0x68	4.9664
000 1001	0x09	0.0873	011 1001	0x39	0.6984	110 1001	0x69	5.5872
000 1010	0x0A	0.097	011 1010	0x3A	0.776	110 1010	0x6A	6.208
000 1011	0x0B	0.1067	011 1011	0x3B	0.8536	110 1011	0x6B	6.8288
000 1100	0x0C	0.1164	011 1100	0x3C	0.9312	110 1100	0x6C	7.4496
000 1101	0x0D	0.1261	011 1101	0x3D	1.0088	110 1101	0x6D	8.0704
000 1110	0x0E	0.1358	011 1110	0x3E	1.0864	110 1110	0x6E	8.6912
000 1111	0x0F	0.1455	011 1111	0x3F	1.164	110 1111	0x6F	9.312
001 1000	0x18	0.1552	100 1000	0x48	1.2416	111 1000	0x78	9.9328
001 1001	0x19	0.1746	100 1001	0x49	1.3968	111 1001	0x79	11.1744
001 1010	0x1A	0.194	100 1010	0x4A	1.552	111 1010	0x7A	12.416
001 1011	0x1B	0.2134	100 1011	0x4B	1.7072	111 1011	0x7B	13.6576
001 1100	0x1C	0.2328	100 1100	0x4C	1.8624	111 1100	0x7C	14.8992
001 1101	0x1D	0.2522	100 1101	0x4D	2.0176	111 1101	0x7D	16.1408
001 1110	0x1E	0.2716	100 1110	0x4E	2.1728	111 1110	0x7E	17.3824
001 1111	0x1F	0.291	100 1111	0x4F	2.328	111 1111	0x7F	18.624