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Introduction
The SPINDLE amplifier is available as a means to cause a realignment of the resolver. This
allows the motor to be configured in either a DELTA or a WYE configuration. Since the motor
is also wound with its windings in a Bi-filar manner, the windings can be placed in either series
or a parallel mode of operation. Although there are four possibilities: parallel DELTA, series
DELTA, parallel WYE, and series WYE, the amplifier only allows three different speed ranges
because two of the combinations produce the same basic KE and KT. The reconfiguration of
the motor windings from a DELTA to a WYE along with series or parallel connections allows
changing the motors KE and KT. This allows the motor and amplifier to produce similar
horsepower in the three speed ranges thus eliminating any complex mechanical gear
reductions.
Along with the shift (SHFT) feature, the TAC KE's are modified to allow the 10 volt command
signal to be scaled to three different maximum speeds: 1200, 2400, and 4200 RPM.
The circuit board has user jumpers to allow for some reconfiguration. The dc voltage
proportional output, proportional to current, can be an absolute value instead of bi-polar. The
amplifier can be configured to have internal ramping of the command signal input with a range
of two to ten seconds. The normal slow output can be configured as an at speed output if the
ramp feature is used.
The CONT (continuous) horsepower is available continuously. The INT (intermittent)
horsepower is available for 3-5 minutes. Operation above the CONT rating will result in a
motor thermal fault condition. The ratings indicated are for motors applied with fan cooling. If
the fan is not used, the ratings have to be deteriorated by 20%.
Standard Spindle Sizes Available
CONT
INT
2.5
5
3.5
7
5
10
*13
24
*13
24
* These combinations of amplifiers and motors require the insertion of external inductors in the RST
leads of the motors. These inductors deteriorate high speed torque. On the high speed winding,
horsepower ratings are typically 1/2.
XXX The suffix on the motor includes factory consideration and all spindle motors must be configured as
specials. The variations deal with faceplate mounting, fans, and different termination methods.
NOTE: There are other 230 Vac/460 Vac amplifiers and motors, but they must be configured as factory
specials.
Amplifier
MPA-25-SPN
MPA-35-SPN
MPA-50-SPN
MPA-75-SPN
MPA-50-460-SPN
AC Line
230
MPM1901FRM-XXX
230
MPM1902FRM-XXX
230
MPM1902FRM-XXX
230
MPM1904FRM-XXX
460
MPM1904FRM-XXX
Motor
3
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