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IPM motor control <IPM>

4.3 IPM motor control

<IPM

Highly efficient motor control and highly accurate motor speed control can be performed by using the inverter with an IPM

motor.

The motor speed is detected by the output voltage and current of the inverter. It does not require a speed detector such as an

encoder. The inverter drives the IPM motor with the least required current when a load is applied in order to achieve the

highest motor efficiency.

4.3.1

Setting procedure of IPM motor control

<IPM>

* IPM parameter initialization is performed by setting

Pr. 998 IPM parameter initialization

or by selecting

(IPM parameter initialization) on the

operation panel.
To change to the IPM motor control, perform IPM parameter initialization at first. If parameter initialization is performed after setting other
parameters, some of those parameters will be initialized too. (

Refer to page 85

for the parameters that are initialized.)

Purpose

Parameter that must be Set

Refer to Page

To perform IPM parameter initialization

IPM parameter initialization

Pr.998

To perform IPM motor test

Control method selection

Pr.800

To adjust the gain for IPM motor control

Adjusting the speed control gain

Pr.820, Pr.821

POINT

The following conditions must be met to perform IPM motor control.



For the motor model, dedicated IPM motor (MM-EF model (1800r/min)) must be used.



The motor capacity must be equivalent to the inverter capacity.



Single-motor operation (one motor run by one inverter) must be performed.



The overall wiring length with the motor must be 100m or less. (50m or less for FR-F740PJ-0.4K)

· This inverter is set for a general-purpose motor in the initial setting. Follow the following procedure to change the setting for the

IPM motor control.

REMARKS



IPM motor control can also be selected with

Pr.80 Motor capacity

and

Pr.998 IPM parameter initialization

(Refer to page 85)



To check the control method (general-purpose motor control/IPM motor control), simply press the setting dial while the
monitor screen is displayed.

(Refer to page 62)

NOTE



The selectable carrier frequencies under IPM motor control are 2.5kHz, 5kHz, 10kHz, and 12.5kHz.



Constant-speed operation cannot be performed in the low-speed range of 150r/min(MM-EFS 1500r/min specification)
or less. Generally, speed control can be performed in the range that satisfies the ratio, 1:10.



During IPM motor control, the RUN signal is output about 100ms after turning ON the start command (STF, STR). The
delay is due to the magnetic pole detection.



The following operations and controls are disabled during IPM motor control: power failure stop, Optimum excitation
control, and speed smoothing control.



The optional surge voltage suppression filter (FR-ASF-H/FR-BMF-H) cannot be used under IPM motor control, so do
not connect it.



When parameter copy is performed from an FR-F700PJ series inverter, which is set to use MM-EFS under IPM motor
control, check that IPM motor control is selected on the operation panel after the copy.

(Refer to page 62)



When parameters are copied to an FR-F700PJ series inverter, which is not compatible with MM-EFS, from an FR-
F700PJ series inverter, which is set to use MM-EFS under IPM motor control, General-purpose magnetic flux vector
control is selected instead of IPM motor control.

IPM

Test run

Perform IPM parameter initialization by selecting the parameter setting mode (IPM) on the operation panel.*

(Refer to page

)

Set the operation command.

(Refer to page 123)

Set "1" or "12" in

(IPM parameter initialization) to select IPM motor

control.

Refer to page 84

for the setting method.